Multiple python installations on opensuse?

[Johan Ekh]

Hi all,
I use the finite element package ABAQUS that is partly built around python
2.4.3.
ABAQUS ships with its own version of python 2.4.3 but it comes without third
party
libraries, e.g. numpy and scipy. In order to load these modules into ABAQUS
python
I must install python 2.4.3. on my opensuse laptop. How can I do this
without interference
with my python 2.6 installation that I use for all my non-ABAQUS python
work?

Best regards,
Johan
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Re: pyZui - anyone know about this?

[David Roberts]

> /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the
> sha module is deprecated; use the hashlib module instead
>   import sha
Yeah, I'd noticed that. It's fixed in the repository now.

On Dec 16, 10:55 pm, Daniel Fetchinson 
wrote:
> > PyZUI 0.1 has been released:
>
> >http://da.vidr.cc/projects/pyzui/
>
> Cool, thanks very much!
>
> I'm using python 2.6 these days and noticed that you use the sha
> module which makes py2.6 spit out a deprecation warning:
>
> /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the
> sha module is deprecated; use the hashlib module instead
>   import sha
>
> It's no big deal but if you want to be future proof maybe you can
> switch to hashlib for py2.6 and stay with sha for py2.5 and before (a
> try/except block would suffice).
>
> Cheers,
> Daniel
>
> --
> Psss, psss, put it down! -http://www.cafepress.com/putitdown

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Re: pyZui - anyone know about this?

[David Roberts]

> Personally I see a merging of normal app windows and a zui: some kind of new
> window manager.
Have you seen Eagle Mode[1]?

[1] http://eaglemode.sourceforge.net/

On Dec 17, 5:14 pm, Donn  wrote:
> On Wednesday 16 December 2009 07:03:19 David Roberts wrote:> It involves 
> scaling an image to various resolutions, and partitioning
> > them into fixed-size tiles. It's roughly the same technique used by
> > Google Maps/Earth.
>
> Thanks. That gives me something to go on. Wikipedia didn't like my search
> terms.
>
> > > ZUIs are useful for particular types of data - images & mapping
> > > especially - but I'd hate to have to navigate my desktop using its
> > > approach.
>
> Ever since Corel Draw in the 90's zoomed into my life I have been in love with
> the idea of an endless canvas that makes me feel like a satellite on a bungee
> cord. I think it would fit the desktop very well.
>
> Personally I see a merging of normal app windows and a zui: some kind of new
> window manager.
> If I planned it out it would look something like this:
> Your apps all run as they do now*, but they live on this endless plain.
> Perhaps it can be divided up into 'zones' or 'galaxies' or something. I would
> have a 'hyperspace' or 'hyperlink' or 'jump' facility (like alt-tab, I guess)
> to make transits from one custom-defined area to another quick.
>
> I would have a home position for the view -- like Inkscape does in terms of
> show all, zoom to selected, zoom to last, etc.
>
> I would have rules about traversing. Things like file-managers need some kind
> of static display - like the bread crumbs and up, back, home etc.
>
> Each app would only be active when 'locked-in', beyond that it's a bitmap of
> the last paint. You could drag apps around when you zoom out, and you can
> resize them at any time too.
> (Just imagine OOCalc in a zui! Super/Capslock and mouse wheel for scroll/pan)
>
> The other cool idea I had was to (handwavium here) graphically convey the
> notion of pipes and import/export between apps. Also between any nodes across
> the Universe of the zui. Perhaps a special 'node view' that overlays and shows
> all the conduits between them -- sharp where your mouse is, faded away from
> that so the whole thing is not too complex.
> Imagine the flow from Inkscape to Gimp and back. Instead of File -> Export and
> then File -> Import, you connect pipes along the side of each app.
> Inkscape, [save selected as png (properties preset)] goes to Gimp [import to
> layers by names (a script perhaps)] Now as you work in Inkscape and hit a
> hotkey, all your selected vectors are sent to Gimp which reacts as if you were
> there and places the new pngs into layers.
> This can work both ways and between multiple programs. Mix-in Blender and
> Scribus and Lyx and some grep and a loop or two and some imagemagick...
>
> Ah, I better stop. I can ramble on sometimes :)
>
> *I have many issues with the endless variety of re-invented wheels afa gui
> toolkits go. This is another whole can of shai-Hulud...
>
> I wrote some stuff about this a while back, if anyone wants to be put to 
> sleep:http://otherwise.relics.co.za/wiki/Particles/DreamDesignApp/
> :)
>
> \d
>
> --
> \/\/ave: donn.in...@googlewave.com
> home:http://otherwise.relics.co.za/
> 2D vector animation :https://savannah.nongnu.org/projects/things/
> Font manager :https://savannah.nongnu.org/projects/fontypython/

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Re: pyZui - anyone know about this?

[Donn]

On Thursday 17 December 2009 10:54:59 David Roberts wrote:
> Have you seen Eagle Mode[1]?
> 
Yes. It's a strange beast. Good start I think; but addicted to zooming, to the 
detriment of the managing aspects I think. Still, here I sit writing no code 
and pontificating!

\d
-- 
\/\/ave: donn.in...@googlewave.com
home: http://otherwise.relics.co.za/
2D vector animation : https://savannah.nongnu.org/projects/things/
Font manager : https://savannah.nongnu.org/projects/fontypython/
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ftplib timeout in Python 2.4

[Nico Grubert]

Hi there,

The ftplib has a timeout parameter in Python 2.6 and above.
Is there a way to set a timeout in Python 2.4?

Regards
Nico
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Re: webscrapping ringcentral.com using mechanize

[S.Selvam]

On Thu, Dec 17, 2009 at 3:34 AM, shrini  wrote:

> Hi,
>
> I am trying to scrap the website 'http://service.ringcentral.com'
>
> It has a form with three input boxes.
>
> When trying to get the form with mechanize, it is throwing the
> following error.
>
> mechanize._mechanize.FormNotFoundError: no form matching name 'login'
>
> but, the page has the form with name "login".
>
> This form is submitted by javascript.
>


  Though i am not sure,i think posting values via urllib  could help .

   Also you may find it useful,


http://stackoverflow.com/questions/1806238/mechanize-python-click-a-button



-- 
Regards,
S.Selvam
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Re: Object Relational Mappers are evil (a meditation)

[Neil Cerutti]

On 2009-12-16, J Kenneth King  wrote:
> The language doesn't encourage anything.  It's just a medium
> like oil paints and canvas.  A painting can be good or bad
> despite the medium it is constructed on.  The skill of the
> painter is what matters.

Technically, oil paints do encourage a certain kind of painting.
They can be layered on top of old paint easily, and they dry
slowly, allowing you to slowly "build up" a painting in layers,
and create effects with texture. If you try doing thse things
with watercolors, and you'll probably be discouraged.

I think a programming language does encourage a certain kind of
code. Good code in one language can be poor in another.

-- 
Neil Cerutti
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Re: csv reader

[Emmanuel]

As csv.reader does not suport utf-8 encoded files, I'm using:

fp = codecs.open(arquivoCSV, "r", "utf-8")
self.tab=[]
for l in fp:
l=l.replace('\"','').strip()
self.tab.append(l.split(','))

It works much better except that when I do self.sel.type("q", ustring)
where ustring is a unicode string obtained from the file using the
code showed above.

Remaining problem is that I obtain  insted of a regular space...
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Re: parallelpython 1.5.7 crash

[makobu]

Thanks Zeph.
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accessing gmail

[Tony]

I'm having trouble getting to gmail messages.  I can access my googlemail 
account through imap with no problems, that's an old one.  The problem is 
trying to get to my current gmail account, which is actually 
t...@tonyburrows.com.  The page shows up as 
mail.google.com/a/tonyburrows.com and I can't see how to get at it.

mail = imaplib.IMAP4_SSL('imap.gmail.com, 993)
mail.login(username, password)

logs me in to my googlemail account and lets me collect mail in that one, 
but how do I get to the gmail one?

Tony
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Re: accessing gmail

[Tony]

Intchanter / Daniel Fackrell wrote:

> http://mail.google.com/support/bin/answer.py?hl=en&answer=77654

Thanks!

Actually I had a sudden inspiration last night as I went to bed.  I'd set 
up Thunderbird, all I needed to do was use the same full h...@domain as the 
username.  Stupid, stupid - I'd wasted so much time and it was so simple.  
I will remember it though.

Now to figure out the rest of it.

Tony
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Python Goldmine has been updated: http://preciseinfo.org/Convert/index_Convert_Python.html

[tanix]

Python Goldmine has been updated as of dec 15 2009.

http://preciseinfo.org/Convert/index_Convert_Python.html

Mirrors:

http://pythongoldmine.vndv.com.

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Re: More stuff added to ch 2 of my programming intro

[Ned Deily]

In article 
<183af5d2-e157-4cd6-bec6-8997809e1...@d21g2000yqn.googlegroups.com>,
 Mensanator  wrote:
> Oh, I don't know, maybe because I'm thinking about
> buying one and seeing 2.3, 2.4 and 2.5 directories
> on the model in the store made me wary.

That's odd since, AFAIK, Apple has never released an OS X with Python 
2.4.

Current Apple systems ship with OS X 10.6, aka Snow Leopard.   10.6 
includes a Python 2.6.1 (64-bit/32-bit) and a Python 2.5.4 (32-bit 
only).  The previous release, 10.5, shipped with 2.5 and 2.3.  But, not 
to worry, if you need other versions, you can download OS X installers 
from python.org.

> > http://www.python.org/download/releases/3.1.1/http://www.python.org/ftp/pyth
> > on/3.1.1/python-3.1.1.dmg
> 
> This tells me nothing.

That's the disk image for the OS X Python 3.1.1 installer.  Official 
binary installers for OS X are provided on python.org for every final 
Python release.

> > or (for MacPorts fans):
> >
> > $ sudo port install python31
> 
> 
> And since I haven't got one, this also tells me nothing.

http://www.macports.org/

"The MacPorts Project is an open-source community initiative to design 
an easy-to-use system for compiling, installing, and upgrading either 
command-line, X11 or Aqua based open-source software on the Mac OS X 
operating system."

-- 
 Ned Deily,
 n...@acm.org

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Re: Multiple python installations on opensuse?

[Ishwor Gurung]

2009/12/17 Johan Ekh :
> Hi all,
> I use the finite element package ABAQUS that is partly built around python
> 2.4.3.
> ABAQUS ships with its own version of python 2.4.3 but it comes without third
> party
> libraries, e.g. numpy and scipy. In order to load these modules into ABAQUS
> python
> I must install python 2.4.3. on my opensuse laptop. How can I do this
> without interference
> with my python 2.6 installation that I use for all my non-ABAQUS python
> work?

Go to python.org, and download appropriate source (shjould be one for
2.4 final release).

$ mkdir $HOME/my2.4build/
$ ./configure --prefix=$HOME/my2.4build && make && make install;


To run-
$ cd $HOME/my2.4build/bin
$ ./python

I am assuming you've got the C/C++ libraries installed.
-- 
Regards,
Ishwor Gurung
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Fwd: Multiple python installations on opensuse?

[Ishwor Gurung]

Scipy needs various libraries. On Ubuntu (which I use) -

Depends: python (< 2.7), python (>= 2.5), python-central (>= 0.6.11),
 python-numpy (>= 1:1.2.0), libblas3gf | libblas.so.3gf |
 libatlas3gf-base, libc6 (>= 2.4), libgcc1 (>= 1:4.1.1), libgfortran3
 (>= 4.3), liblapack3gf | liblapack.so.3gf | libatlas3gf-base,
 libstdc++6 (>= 4.1.1), libsuitesparse-3.2.0 (>= 1:3.2.0)

So, doing a source/binary install similarly and then install Scipy again.

-- Forwarded message --
From: Johan Ekh 
Date: 2009/12/17
Subject: Re: Multiple python installations on opensuse?
To: Ishwor Gurung 


Thanks guys,
I installed it as root without the --prefix option using "make
altinstall" instead of "make install".
It worked and I can now execute python2.4.6 with "python2.4 while
python2.6 is still executed
with "python".

I also managed to install numpy with "python2.4 setup.py install".
However, installing scipy
in the same way failed with the error below. Most of my libraries
appears to be in /usr/lib64/
or /usr/local/lib64 and the install script can't find them because it
searched /usr/lib/ and /usr/local/lib/.

How can I fix this?

Sorry for newbiesh questions...

//Johan

== Output from "python2.4 setup.py install"

Warning: No configuration returned, assuming unavailable.
blas_opt_info:
blas_mkl_info:
  libraries mkl,vml,guide not found in /usr/local/lib
  libraries mkl,vml,guide not found in /usr/lib
  NOT AVAILABLE

atlas_blas_threads_info:
Setting PTATLAS=ATLAS
  libraries ptf77blas,ptcblas,atlas not found in /usr/local/lib
  libraries ptf77blas,ptcblas,atlas not found in /usr/lib
  NOT AVAILABLE

atlas_blas_info:
  libraries f77blas,cblas,atlas not found in /usr/local/lib
  libraries f77blas,cblas,atlas not found in /usr/lib
  NOT AVAILABLE

/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1340:
UserWarning:
    Atlas (http://math-atlas.sourceforge.net/) libraries not found.
    Directories to search for the libraries can be specified in the
    numpy/distutils/site.cfg file (section [atlas]) or by setting
    the ATLAS environment variable.
  warnings.warn(AtlasNotFoundError.__doc__)
blas_info:
  libraries blas not found in /usr/local/lib
  libraries blas not found in /usr/lib
  NOT AVAILABLE

/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1349:
UserWarning:
    Blas (http://www.netlib.org/blas/) libraries not found.
    Directories to search for the libraries can be specified in the
    numpy/distutils/site.cfg file (section [blas]) or by setting
    the BLAS environment variable.
  warnings.warn(BlasNotFoundError.__doc__)
blas_src_info:
  NOT AVAILABLE

/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1352:
UserWarning:
    Blas (http://www.netlib.org/blas/) sources not found.
    Directories to search for the sources can be specified in the
    numpy/distutils/site.cfg file (section [blas_src]) or by setting
    the BLAS_SRC environment variable.
  warnings.warn(BlasSrcNotFoundError.__doc__)
Traceback (most recent call last):
  File "setup.py", line 92, in ?
    setup_package()
  File "setup.py", line 84, in setup_package
    configuration=configuration )
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/core.py",
line 150, in setup
    config = configuration()
  File "setup.py", line 54, in configuration
    config.add_subpackage('scipy')
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 851, in add_subpackage
    caller_level = 2)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 834, in get_subpackage
    caller_level = caller_level + 1)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 781, in _get_configuration_from_setup_py
    config = setup_module.configuration(*args)
  File "scipy/setup.py", line 8, in configuration
    config.add_subpackage('integrate')
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 851, in add_subpackage
    caller_level = 2)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 834, in get_subpackage
    caller_level = caller_level + 1)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py",
line 781, in _get_configuration_from_setup_py
    config = setup_module.configuration(*args)
  File "scipy/integrate/setup.py", line 10, in configuration
    blas_opt = get_info('blas_opt',notfound_action=2)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py",
line 267, in get_info
    return cl().get_info(notfound_action)
  File "/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py",
line 416, in get_info
    raise self.notfounderror,self.notfounderror.__doc__
numpy.distutils.system_info.BlasNotFoundError:
    Blas (http://www.netlib.org/blas/) libraries not found.
    Directories to search for the libraries can be specified in the
    numpy/distu

Re: (OT) Where Are Cookies Stored?

[Lie Ryan]

On 12/17/2009 2:33 AM, Dave Angel wrote:



Victor Subervi wrote:

On Tue, Dec 15, 2009 at 6:57 PM, r0g  wrote:



Cookies in FF for Windows are stored in an sqlite database in here...

~\Application Data\Mozilla\Firefox\Profiles\%XYZ%\firefox_profile\



Man, I searched C drive (the only drive) on this computer where I'm
working
(Internet cafe) for "Application Data" and nuttin.
V


How are you searching? Microsoft is so sure we don't want to see the
gory details that they hide all sorts of things, by default. And
especially on a public computer, you shouldn't even look with Explorer.
As for searching with Explorer, there are not only design problems, but
bugs as well. Get a command line, and do something like:




Or, you can just open Internet Explorer, type at the address bar 
"www.google.com"; then wait for a few seconds. After the page loads, 
type "windows {VERSION} application data" where you substitute {VERSION} 
with the windows version you're using. Press "I'm feeling lucky" and 
skim the page for something that looks like pathnames.

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Re: Help with parsing a list

[Sallu]

On Dec 17, 4:23 am, "thunderf...@gmail.com" 
wrote:
> not as slick as Emile's (didn't think about using strip() ), but
> seemingly functional:
>
> data = ['key1: data1','key2: data2','key3: data3',' key4: ','
> \tdata4.1',' \tdata4.2',' \tdata4.3','key5: data5']
> result = {}
>
> for item in data:
>     if item.endswith(': '):
>         currkey = item[:-2]
>         result[currkey] = []
>     elif item.startswith(' \t'):
>         result[currkey].append(item[2:])
>     else:
>         key, val = item.split(': ')
>         result[key] = val
>
> print 'data = %s' % data
> print 'result = %s' % result
>
>
>
> data = ['key1: data1', 'key2: data2', 'key3: data3', ' key4: ', '
> \tdata4.1', ' \tdata4.2', ' \tdata4.3', 'key5: data5']
> result = {'key3': 'data3', 'key2': 'data2', 'key1': 'data1', 'key5':
> 'data5', ' key4': ['data4.1', 'data4.2', 'data4.3']}
>
>
>
>

Hi i tried with thunderfoot code

error:

Traceback (most recent call last):
  File "", line 8, in ?
ValueError: need more than 1 value to unpack
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Re: PIL: problem to convert an image array to PIL format

[Robert Franke]

Hi,

On Thu, Dec 17, 2009 at 1:14 PM, Sverre  wrote:

> After converting a PIL image in memory to an array with numpy.asarray
> (), I make a adthreshold() with pymorph() with the result, that all
> pixels in the array are either false or true (boolean). But my try to
> convert this back into PIL format is failing
>
> img = Image.fromarray(rawimg, '1')
>
> because a true will be interpreted as integer 1 ), so that 7 pixels
> are black and one white. Has someone a solution, so that a  picture
> inly with "true" values doesn't look like this?
>
> http://img707.imageshack.us/img707/6051/p012.jpg
>
>
I am not 100% sure this is what you want, but this is how I apply a simple
threshold to a picture:


threshold = 145
img = Image.open("gray.jpg")
arr = numpy.asarray(img)
filtered = arr * (arr < threshold)
new_img = Image.fromarray(filtered,"L")


Cheers,

Robert
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file.close() does not really close under Windows?

[Dani]

Is it correct that low-level file handles are not being closed after
doing

  fd = open(filepath)
  fd.close()

If so, what is the rationale?

This seems to result in system errors when trying to (re-)move or
reopen "closed" files, as well as when opening (and closing) too many
files under Windows.

A workaround seems to be

  os_fd = os.open(filepath)
  fd = os.fdopen(os_fd)
  os.close(os_fd)
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Re: ftplib timeout in Python 2.4

[r0g]

Nico Grubert wrote:
> Hi there,
> 
> The ftplib has a timeout parameter in Python 2.6 and above.
> Is there a way to set a timeout in Python 2.4?
> 
> Regards
> Nico


I don't know of one so you may need a workaround. What platforms do you
need to support?

Roger.
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When to use mechanize and Windmill library during WebScraping ?

[Raji Seetharaman]

>
> -- Forwarded message --
> From: Javier Collado 
> To: Raji Seetharaman 
> Date: Sat, 12 Dec 2009 12:52:27 +0100
> Subject: Re: When to use mechanize and Windmill library during WebScraping
> ?
> Hello,
>
> If a script that uses mechanize fails to find an html node that has
> been identified with Firebug, this is probably because that node has
> been autogenerated (provided that the expression to get the node is
> correct).
>
> As an alternative to verify this, you can try to download the html
> page and open it in your favourite editor. If some of the nodes that
> you can see in your browser are missing or empty, then one of the
> JavaScript scripts in the page should have created/populated it.
>
> If you're in doubt, you can try to use mechanize and, if you have
> problems such as the described above, then you can move to windmill or
> some other tool that executes JavaScript code before trying to get the
> desired data.
>
> Best regards,
>Javier
>
>
Thanks for your help

Raji. S
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When to use mechanize and Windmill library during WebScraping ?

[Raji Seetharaman]

> Be sure to look at Scrapy too: http://scrapy.org
>
>
> Thank U

Raji. S
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Re: pyZui - anyone know about this?

[Daniel Fetchinson]

>> /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the
>> sha module is deprecated; use the hashlib module instead
>>   import sha
> Yeah, I'd noticed that. It's fixed in the repository now.

Great, thanks, pulled it and all looks good.

Cheers,
Daniel


>> > PyZUI 0.1 has been released:
>>
>> >http://da.vidr.cc/projects/pyzui/
>>
>> Cool, thanks very much!
>>
>> I'm using python 2.6 these days and noticed that you use the sha
>> module which makes py2.6 spit out a deprecation warning:
>>
>> /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the
>> sha module is deprecated; use the hashlib module instead
>>   import sha
>>
>> It's no big deal but if you want to be future proof maybe you can
>> switch to hashlib for py2.6 and stay with sha for py2.5 and before (a
>> try/except block would suffice).
>>
>> Cheers,
>> Daniel
>>
>> --
>> Psss, psss, put it down! -http://www.cafepress.com/putitdown
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown
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Re: Multiple python installations on opensuse?

[Ishwor Gurung]

2009/12/17 Johan Ekh :
> But I have them installed already! I have scipy installed under python 2.6
> and everything runs perfect.

ok

> It is only under python 2.4 that the install script can not find the
> libraries. I need to tell the script to
> lookin /usr/lib64 instead /usr/lib, how can I do this?

As root, tell linker to look for libraries in /usr/lib64:
$ echo /usr/lib64 >> /etc/ld.so.conf
$ ldconfig
$ ./configure

Please send email to the mailing list. I am subscribed to it :>

[...]
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Re: file.close() does not really close under Windows?

[Clovis Fabricio]

Hello Dani,

2009/12/17 Dani :
> Is it correct that low-level file handles are not being closed after
> doing
>  fd = open(filepath)
>  fd.close()
> If so, what is the rationale?

No, it is incorrect. I tested that exact snippet here and it correctly
closes the file. I can move the file around just after that.

There must be something wrong elsewhere on your code.

That said, you could use the "with" statement in python >2.5 to make it clearer:

with open(filepath) as fd:
   # ... do stuff with fd ...

The file will be closed at the end of the with block.

nosklo
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Re: file.close() does not really close under Windows?

[Tim Chase]

Dani wrote:

Is it correct that low-level file handles are not being closed after
doing

  fd = open(filepath)
  fd.close()


no, you are not correct.

Demonstration:

Cmd window #1:

c:\temp> echo hello world > x.txt

Cmd window #2

c:\temp> python
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more 
information.

>>> f = file('x.txt')
>>> f.close()
>>> # remaining in an open python session


back to Cmd window #1
C:\temp> del x.txt
C:\temp> rem note...no error here.
C:\temp> exit

back to Cmd window #2
>>> # quit python
>>> ^Z
C:\temp> exit



If so, what is the rationale?


it's not because there is no good rationale for wanting that 
behavior :)  The above was performed on XP (SP2 & SP3) with no 
issues.  I can't guarantee that MS hasn't borked something in 
Vista or Win7, but if they did, that's *their* issue, not Python's.



This seems to result in system errors when trying to (re-)move or
reopen "closed" files, as well as when opening (and closing) too many
files under Windows.


As always, check your own code/environment before assuming the 
problem is with Python.  In all likelihood, you had the file open 
in another window/process and didn't remember.  Perhaps some 
background indexing process happened to hold the file open for a 
brief spell?


-tkc



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Re: ftplib timeout in Python 2.4

[Nico Grubert]

I don't know of one so you may need a workaround. What platforms do you

> need to support?

Suse Linux Enterprise 10, 64 Bit with Python 2.4.4.
I need the Python 2.4.4 for a running application Server (Zope).
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Re: PIL: problem to convert an image array to PIL format

[Peter Otten]

Sverre wrote:

> After converting a PIL image in memory to an array with numpy.asarray
> (), I make a adthreshold() with pymorph() with the result, that all
> pixels in the array are either false or true (boolean). But my try to
> convert this back into PIL format is failing
> 
> img = Image.fromarray(rawimg, '1')
> 
> because a true will be interpreted as integer 1 ), so that 7 pixels
> are black and one white. Has someone a solution, so that a  picture
> inly with "true" values doesn't look like this?
> 
> http://img707.imageshack.us/img707/6051/p012.jpg

This has come up before, see

http://mail.python.org/pipermail/python-list/2009-October/1221578.html

Image.fromarray() expects one bit per pixel but actually gets one byte. One 
possible workaround: introduce an intermediate array with a format 
understood by fromarray():

>>> import numpy
>>> from PIL import Image
>>> rawimg = numpy.zeros((20, 20), bool)
>>> rawimg[:10, :10] = rawimg[10:, 10:] = True
>>> b = numpy.array(rawimg, numpy.uint8)
>>> b *= 255
>>> Image.fromarray(b).save("tmp.jpg")

Peter
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Re: file.close() does not really close under Windows?

[Dani]

> No, it is incorrect. I tested that exact snippet here and it correctly
> closes the file. I can move the file around just after that.

Yes, indeed. Sorry for not getting my facts straight and thank you for
testing. Part of the code *was* holding a low-level file handle.
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Re: Raw string substitution problem

[Alan G Isaac]

En Wed, 16 Dec 2009 11:09:32 -0300, Ed Keith  escribió:


I am having a problem when substituting a raw string. When I do the
following:

re.sub('abc', r'a\nb\nc', '123abcdefg')

I get

"""
123a
b
cdefg
"""

what I want is

r'123a\nb\ncdefg'


 
On 12/16/2009 9:35 AM, Gabriel Genellina wrote:

 From http://docs.python.org/library/re.html#re.sub

re.sub(pattern, repl, string[, count])

...repl can be a string or a function; if
it is a string, any backslash escapes in
it are processed. That is, \n is converted
to a single newline character, \r is
converted to a linefeed, and so forth.

So you'll have to double your backslashes:




I'm not persuaded that the docs are clear.  Consider:

>>> 'ab\\ncd' == r'ab\ncd'
True

Naturally enough.  So I think the right answer is:

1. this is a documentation bug (i.e., the documentation
   fails to specify unexpected behavior for raw strings), or
2. this is a bug (i.e., raw strings are not handled correctly
   when used as replacements)

I vote for 2.

Peter's use of a function highlights just how odd this is:
getting the raw string via a function produces a different
result than providing it directly.  If this is really the
way things ought to be, I'd appreciate a clear explanation
of why.

Alan Isaac

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Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[python]

Does anyone have any recommendations on which version of the
MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9)
based executable? (I assume I need just a matching pair of MSVCR90.DLL
and MSVCP90.DLL?)

My understanding is that I need to match the version of the DLL's that
my version of Python 2.6.4 was compiled against?

On my Windows 7 Professional (64-bit) workstation, I have the following
sets of MSVC?9.DLL files to choose from. 

Directory of C:\Program Files\Sony\VAIO Care
07/14/2009  01:18 PM   245,248 msvcm90.dll
07/14/2009  01:18 PM   851,456 msvcp90.dll
07/14/2009  01:18 PM   627,200 msvcr90.dll
   3 File(s)  1,723,904 bytes

Directory of C:\Program Files\Sony\VAIO
Care\plugins\Microsoft.VC90.CRT
07/14/2009  01:18 PM   245,248 msvcm90.dll
07/14/2009  01:18 PM   851,456 msvcp90.dll
07/14/2009  01:18 PM   627,200 msvcr90.dll
   3 File(s)  1,723,904 bytes

Directory of C:\Program Files (x86)\Sony\VAIOData Restore Tool
11/26/2008  10:26 AM   568,832 msvcp90.dll
11/26/2008  08:57 AM   655,872 msvcr90.dll
   2 File(s)  1,224,704 bytes

Directory of C:\Program Files (x86)\Sony\VAIO Recovery\plugins
07/15/2009  05:21 PM   224,768 msvcm90.dll
07/15/2009  05:21 PM   568,832 msvcp90.dll
07/15/2009  05:21 PM   655,872 msvcr90.dll
   3 File(s)  1,449,472 bytes

Directory of C:\Program Files (x86)\Sony\VAIO
Recovery\plugins\x64
07/15/2009  05:21 PM   627,200 msvcr90.dll
   1 File(s)627,200 bytes
Directory of C:\Program Files (x86)\Sony\VAIO VP Utilities
04/02/2009  07:12 PM   568,832 msvcp90.dll
04/02/2009  07:12 PM   655,872 msvcr90.dll
   2 File(s)  1,224,704 bytes

Directory of
C:\Windows\winsxs\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.2
1022.8_none_750b37ff97f4f68b
09/04/2009  04:35 AM   245,248 msvcm90.dll
09/04/2009  04:35 AM   851,456 msvcp90.dll
09/04/2009  04:35 AM   627,200 msvcr90.dll
   3 File(s)  1,723,904 bytes

Directory of
C:\Windows\winsxs\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.3
0729.4926_none_08e1a05ba83fe554
06/10/2009  03:31 PM   245,760 msvcm90.dll
06/10/2009  03:31 PM   853,328 msvcp90.dll
06/10/2009  03:31 PM   623,440 msvcr90.dll
   3 File(s)  1,722,528 bytes

Directory of
C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.210
22.8_none_bcb86ed6ac711f91
09/04/2009  04:35 AM   224,768 msvcm90.dll
09/04/2009  04:35 AM   568,832 msvcp90.dll
09/04/2009  04:35 AM   655,872 msvcr90.dll
   3 File(s)  1,449,472 bytes

Directory of
C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.307
29.1_none_e163563597edeada
09/04/2009  04:19 AM   225,280 msvcm90.dll
09/04/2009  04:19 AM   572,928 msvcp90.dll
09/04/2009  04:19 AM   655,872 msvcr90.dll
   3 File(s)  1,454,080 bytes

Directory of
C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.307
29.4926_none_508ed732bcbc0e5a
06/10/2009  04:14 PM   225,280 msvcm90.dll
06/10/2009  04:14 PM   569,664 msvcp90.dll
06/10/2009  04:14 PM   652,608 msvcr90.dll
   3 File(s)  1,447,552 bytes

Thank you,
Malcolm
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Re: Where is PyMethod_GET_CLASS in Python 3?

[Antoine Pitrou]

Le Tue, 15 Dec 2009 08:08:01 -0800, Infinity77 a écrit :
> 
> When building C extensions In Python 2.X, there was a magical
> PyMethod_GET_CLASS implemented like this:
> 
> #define PyMethod_GET_CLASS(meth) \
>   (((PyMethodObject *)meth) -> im_class)
> 
> It looks like Python 3 has wiped out the "im_class" attribute. Which is
> the alternative was to handle this case in Python 3?

First, is it a bound method? Unbound methods are just function objects in 
py3k. Check that PyMethod_Check() returns true.
Second, have you tried Py_TYPE(PyMethod_GET_SELF(meth))?

> BTW, it's very, very,
> *very* hard to find any possible reference to help migrating existing C
> extensions from Python 2.X to Python 3.

There's http://docs.python.org/3.1/howto/cporting.html
You are encouraged to post any suggestions or corrections on the bug 
tracker: http://bugs.python.org

Finally, there's also a dedicated mailing-list for porting to py3k:
http://mail.python.org/mailman/listinfo/python-porting
While it hasn't seen a lot of activity lately, I'm sure there are people 
there willing to answer any questions you have!

Regards

Antoine.


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Re: More stuff added to ch 2 of my programming intro

[Benjamin Kaplan]

On Thu, Dec 17, 2009 at 5:33 AM, Ned Deily  wrote:
>
>> > or (for MacPorts fans):
>> >
>> > $ sudo port install python31
>>
>>
>> And since I haven't got one, this also tells me nothing.
>
> http://www.macports.org/
>
> "The MacPorts Project is an open-source community initiative to design
> an easy-to-use system for compiling, installing, and upgrading either
> command-line, X11 or Aqua based open-source software on the Mac OS X
> operating system."

Description sans marketing fluff: It's a Mac package manager. It's
basically the same as Gentoo's portage if you've ever used that. It
downloads source tarballs and patches and then compiles them locally.
There are built-in lists of "variants", basically sets of configure
args, to compile each package.
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Re: Raw string substitution problem

[Richard Brodie]

"Alan G Isaac"  wrote in message 
news:qemdnrut0jvj1lfwnz2dnuvz_vqdn...@rcn.net...

> Naturally enough.  So I think the right answer is:
>
> 1. this is a documentation bug (i.e., the documentation
>fails to specify unexpected behavior for raw strings), or
> 2. this is a bug (i.e., raw strings are not handled correctly
>when used as replacements)

 There is no raw string. 

A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.

>>> (r'\n', u'a', 0x16)
('\\n', u'a', 22)





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Re: frames in toplevel Tkinter

[J Wolfe]

On Dec 16, 11:09 pm, J Wolfe  wrote:
> Probably a stupid question, but can you have a frames in a toplevel
> widget? Anything I try to put in a frame goes back to the main or root
> widget and not the toplevel or pop-up widget.
>
> Thanks for the help!
> Jonathan

Thank you John,

from Tkinter import *
root = Tk()
Label(root, text='This is the root window').pack()
top = Toplevel(root)
fr = Frame(top)   # frame child of Toplevel called top
fr.pack()
Label(fr, text='This is in a frame in the Toplevel window').pack()
root.mainloop()

I swear I tried that about 20 times yesterday...and it kept putting it
in my main window.  Perhaps I had a naming issue.

Thanks!
Jonathan
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Re: Using Python to Execute a C or FORTRAN Program (Windows)

[W. eWatson]

sturlamolden wrote:

On 17 Des, 03:41, "W. eWatson"  wrote:


His program was originally written in Python, but a new
hardware device (capture card) had no good interface with Python, so he
wrote it in C++, which does. From my knowledge of the Python program
before the entry of c++, it seems he could have farmed out the hardware
interface in much the same way he had done it before with a capture card
well know to him.


This sounds a bit incompetent.

Why didn't he just write an extension module in C++?

Also, if you don't know how to spawn a subprocess, I'd question your
competence as well.



I can't read his mind.
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Re: Either IDLE Can't Start a subprocess or a firewall software firewall is blocking the connection (Win)--Battlin McAfee

[W. eWatson]

Alf P. Steinbach wrote:

* W. eWatson:
See Subject msg from Python 2.5 Win XP. It is preceded by a "Socket 
Error". It happened while I had a simple program displayed, and I 
wanted to see the shell. The msg occurred when I pressed Shell on Run 
from the menu. I played around for awhile, but got nowhere. Same msg. 
I did remove my McAfee firewall protection, and it worked once, but 
reverted to not working.


I rebooted and the first time I could use Shell, it succeeded. After 
that it failed. Comments? Geeze! Mcaffe turned on the firewall again 
after the reboot.


All seems well now. Nope. McAfee turned the firewall back on. It 
decided to warn me it was off, but now has allowed me to ignore the 
fact it is "no longer protecting me". I'll just let Win firewall do 
that, thank you.


Nope it's back. I'll just stop here and let anyone who wants to just 
chime in. If I get it to stop, I'll be back.


I recall vaguely some similar problem caused by a program attempting to 
connect to localhost, and the solution then was to edit the hosts file 
(don't ask me for details, but perhaps that'll help you search: that 
problem had entirely to do with Windows' very over-zealous "security" 
measures).



Cheers & hth.,

- Alf

As it turns out, I can "sneak" around it, so I'm putting it aside.
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Re: PIL: problem to convert an image array to PIL format

[Sverre]

On 17 Des, 15:45, Peter Otten <__pete...@web.de> wrote:
>
> This has come up before, see
>
> http://mail.python.org/pipermail/python-list/2009-October/1221578.html
>

> Peter

Thank you!

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Re: iterators and views of lists

[Anh Hai Trinh]

> I have a couple of thoughts:
> 1. Since [:] by convention already creates a copy, it might violate
> people's expectations if that syntax were used.

Indeed, listagent returns self on __getitem__[:]. What I meant was
this:

  x = [0, 1, 2, 3, 4, 5, 6, 7]
  a = listagent(x)[::2]
  a[:] = listagent(x)[::-2]

And we get x = [7, 1, 5, 3, 3, 5, 1, 7], the copying happens in-place,
of course.


> 2. I'd give the listagent the mutable sequence interface

Done!  I put the code in a repository here for those who might be
interested:
.

In retrospect, the Python gurus here was right though. Copy, modify
then replace is good enough, if not better since items are just
pointers instead of values. For reversing, you need to translate all
the indices (which cost exactly one addition and one multiplication
per index). Is that cheaper than copying all the pointers to a new
list?  For sorting, you definitely need to construct a lookup table
since the sort algorithm needs to look over the indices multiple
times, which means you are using two pointer indirections per index.
Is that cheaper than just copying all the pointers to a new list? Even
if there is any benefit at all, you'll need to implement listagent in
C to squeeze it out.

However, using listagents is faster if you just want a few items out
of the slice. And it's cute.

Peace,
aht
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Re: Raw string substitution problem

[Alan G Isaac]

On 12/17/2009 11:24 AM, Richard Brodie wrote:

A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.


(r'\n', u'a', 0x16)

('\\n', u'a', 22)




Yes, that was a mistake.  But the problem remains::

>>> re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc', 
'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
True
>>> r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
False

Why are the first two strings being treated as if they are the last one?
That is, why isn't '\\' being processed in the obvious way?
This still seems wrong.  Why isn't it?

More simply, consider::

>>> re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
  File "", line 1, in 
  File "C:\Python26\lib\re.py", line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
  File "C:\Python26\lib\re.py", line 273, in _subx
template = _compile_repl(template, pattern)
  File "C:\Python26\lib\re.py", line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)

Why is this the proper handling of what one might think would be an
obvious substitution?

Thanks,
Alan Isaac
 
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Re: Help with parsing a list

[thunderf...@gmail.com]

On Dec 17, 6:05 am, Sallu  wrote:
> Hi i tried with thunderfoot code
>
> error:
>
> Traceback (most recent call last):
>   File "", line 8, in ?
> ValueError: need more than 1 value to unpack- Hide quoted text -
>

hence, my 'seemingly' functional qualification. :)

that's most likely to due to a datum starting with '\t' instead of '
\t'. yet another reason that emile's code is superior to my one off.
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Re: Raw string substitution problem

[D'Arcy J.M. Cain]

On Thu, 17 Dec 2009 11:51:26 -0500
Alan G Isaac  wrote:
>  >>> re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc', 
> 'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
>  True

Was this a straight cut and paste or did you make a manual change?  Is
that leading space in the middle one a copying error?  I get False for
what you actually have there for obvious reasons.

>  >>> r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
>  False
> 
> Why are the first two strings being treated as if they are the last one?

They aren't.  The last string is different.

>>> for x in (r'a\nb\n.c\a', 'a\\nb\\n.c\\a', 'a\nb\n.c\a'): print repr(x)
...
'a\\nb\\n.c\\a'
'a\\nb\\n.c\\a'
'a\nb\n.c\x07'

> That is, why isn't '\\' being processed in the obvious way?
> This still seems wrong.  Why isn't it?

What do you think is wrong?  What would the "obvious" way of handling
'//' be?
> 
> More simply, consider::
> 
>  >>> re.sub('abc', '\\', '123abcdefg')
>  Traceback (most recent call last):
>File "", line 1, in 
>File "C:\Python26\lib\re.py", line 151, in sub
>  return _compile(pattern, 0).sub(repl, string, count)
>File "C:\Python26\lib\re.py", line 273, in _subx
>  template = _compile_repl(template, pattern)
>File "C:\Python26\lib\re.py", line 260, in _compile_repl
>  raise error, v # invalid expression
>  sre_constants.error: bogus escape (end of line)
> 
> Why is this the proper handling of what one might think would be an
> obvious substitution?

Is this what you want?  What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.

>>> re.sub('abc', r'\\', '123abcdefg')
'123\\defg'

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Re: Raw string substitution problem

[MRAB]

Alan G Isaac wrote:

On 12/17/2009 11:24 AM, Richard Brodie wrote:

A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.


(r'\n', u'a', 0x16)

('\\n', u'a', 22)




Yes, that was a mistake.  But the problem remains::

>>> re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc', 
'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')

True
>>> r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
False

Why are the first two strings being treated as if they are the last one?
That is, why isn't '\\' being processed in the obvious way?
This still seems wrong.  Why isn't it?

More simply, consider::

>>> re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
  File "", line 1, in 
  File "C:\Python26\lib\re.py", line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
  File "C:\Python26\lib\re.py", line 273, in _subx
template = _compile_repl(template, pattern)
  File "C:\Python26\lib\re.py", line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)

Why is this the proper handling of what one might think would be an
obvious substitution?


Regular expressions and replacement strings have their own escaping
mechanism, which also uses backslashes.

Some of these regex escape sequences are the same as those of string
literals, eg \n represents a newline; others are different, eg \b in a
regex represents a word boundary and not a backspace as in a string
literal.

You can match a newline in a regex by either using an actual newline
character ('\n' in a string literal) or an escape sequence ('\\n' or
r'\n' in a string literal). If you want a regex to match an actual
backslash followed by a letter 'n' then you need to escape the backslash
in the regex and then either use a raw string literal or escape it again
in a non-raw string literal.

Match characters: 
Regex: \n
Raw string literal: r'\n'
Non-raw string literal: '\\n'

Match characters: \n
Regex: \\n
Raw string literal: r'\\n'
Non-raw string literal: 'n'

Replace with characters: 
Replacement: \n
Raw string literal: r'\n'
Non-raw string literal: '\\n'

Replace with characters: \n
Replacement: \\n
Raw string literal: r'\\n'
Non-raw string literal: 'n'
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shouldn't list comprehension be faster than for loops?

[Carlos Grohmann]

Hello all

I am testing my code with list comprehensions against for loops.

the loop:

dipList=[float(val[1]) for val in datalist]
dip1=[]
for dp in dipList:
if dp == 90:
dip1.append(dp - 0.01)
else:
dip1.append(dp)

listcomp:

dipList=[float(val[1]) for val in datalist]
dip1=[(dp, dp-0.01)[dp==90.0] for dp in dipList]


Tenting the time spent by each approach (using time.clock()), with a
file with about 100,000 entries, I get 0.03s for the loop and 0.05s
for the listcomp.

thoughts?

TIA
Carlos

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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[Ross Ridge]

 wrote:
>Does anyone have any recommendations on which version of the
>MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9)
>based executable? (I assume I need just a matching pair of MSVCR90.DLL
>and MSVCP90.DLL?)

Either the one the came with your copy Microsoft Visual C++ or Python
2.6.4.  Otherwise, you don't have the legal right to redistribute
Microsoft's code.

Ross Ridge

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[oo][oo]  rri...@csclub.uwaterloo.ca
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Re: pyZui - anyone know about this?

[Terry Reedy]

On 12/17/2009 2:14 AM, Donn wrote:

On Wednesday 16 December 2009 07:03:19 David Roberts wrote:

It involves scaling an image to various resolutions, and partitioning
them into fixed-size tiles. It's roughly the same technique used by
Google Maps/Earth.

Thanks. That gives me something to go on. Wikipedia didn't like my search
terms.


ZUIs are useful for particular types of data - images&  mapping
especially - but I'd hate to have to navigate my desktop using its
approach.

Ever since Corel Draw in the 90's zoomed into my life I have been in love with
the idea of an endless canvas that makes me feel like a satellite on a bungee
cord. I think it would fit the desktop very well.

Personally I see a merging of normal app windows and a zui: some kind of new
window manager.


The original idea, perhaps, was from Jef Raskin in The Human Interface. 
Wikipedia has articles on both. His idea was for a document rather than 
app centric plain. Not clear how one would pipe data from app to app in 
his model, though.


tjr

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Re: shouldn't list comprehension be faster than for loops?

[Alf P. Steinbach]

* Carlos Grohmann:

Hello all

I am testing my code with list comprehensions against for loops.

the loop:

dipList=[float(val[1]) for val in datalist]
dip1=[]
for dp in dipList:
if dp == 90:
dip1.append(dp - 0.01)
else:
dip1.append(dp)

listcomp:

dipList=[float(val[1]) for val in datalist]
dip1=[(dp, dp-0.01)[dp==90.0] for dp in dipList]


Tenting the time spent by each approach (using time.clock()), with a
file with about 100,000 entries, I get 0.03s for the loop and 0.05s
for the listcomp.

thoughts?


In the list comprehension you're constructing n tuples that you're not 
constructing in the loop.


Have you tried this with

  dip1 = [dp - 0.01 if dp == 90 else dp for dp in dipList]

?


Cheers & hth.,

- Alf
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Re: Raw string substitution problem

[Alan G Isaac]

Alan G Isaac  wrote:

  >>>  re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc', 
'a\\nb\\n.c\\a','123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
  True
Why are the first two strings being treated as if they are the last one?
 


On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:

They aren't.  The last string is different.


Of course it is different.
That is the basis of my question.
Why is it being treated as if it is the same?
(See the end of this post.)



Alan G Isaac  wrote:

More simply, consider::

  >>>  re.sub('abc', '\\', '123abcdefg')
  Traceback (most recent call last):
File "", line 1, in
File "C:\Python26\lib\re.py", line 151, in sub
  return _compile(pattern, 0).sub(repl, string, count)
File "C:\Python26\lib\re.py", line 273, in _subx
  template = _compile_repl(template, pattern)
File "C:\Python26\lib\re.py", line 260, in _compile_repl
  raise error, v # invalid expression
  sre_constants.error: bogus escape (end of line)

Why is this the proper handling of what one might think would be an
obvious substitution?



On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:

Is this what you want?  What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.

 re.sub('abc', r'\\', '123abcdefg')
> '123\\defg'


Turning again to the documentation:
"if it is a string, any backslash escapes in it are processed.
That is, \n is converted to a single newline character, \r is
converted to a linefeed, and so forth."
So why is '\n' converted to a newline but '\\' does not become a literal
backslash?  OK, I don't do much string processing, so perhaps this is where
I am missing the point: how is the replacement being "converted"?
(As Peter's example shows, if you supply the replacement via
a function, this does not happen.) You suggest it is just a matter of
it being an re, but::

>>> re.sub('abc', 'a\\nc','1abcd') == re.sub('abc', 'a\nc','1abcd')
True
>>> re.compile('a\\nc') == re.compile('a\nc')
False

So I have two string that are not the same, nor do they compile
equivalently, yet apparently they are "converted" to something
equivalent for the substitution. Why? Is my question clearer?

If the answer looks too obvious to state, assume I'm missing it anyway
and please state it.  As I said, I seldom use the re module.

Alan Isaac
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Re: More stuff added to ch 2 of my programming intro

[Mensanator]

On Dec 17, 4:33 am, Ned Deily  wrote:
> In article
> <183af5d2-e157-4cd6-bec6-8997809e1...@d21g2000yqn.googlegroups.com>,
>
>  Mensanator  wrote:
> > Oh, I don't know, maybe because I'm thinking about
> > buying one and seeing 2.3, 2.4 and 2.5 directories
> > on the model in the store made me wary.
>
> That's odd since, AFAIK, Apple has never released an OS X with Python
> 2.4.

Hmm...I was poking around in the finder on a display of new
iMacs at Best Buy last saturday. I searched for "python" and
it took me to a directory listing with three items:
Python 2.3
Python 2.4
Python 2.5

It's possible that Python 2.6 is located somewhere else. I assume
that Snow Leopard was installed, but I didn't actually check that.

>
> Current Apple systems ship with OS X 10.6, aka Snow Leopard.   10.6
> includes a Python 2.6.1 (64-bit/32-bit) and a Python 2.5.4 (32-bit
> only).  The previous release, 10.5, shipped with 2.5 and 2.3.  But, not
> to worry, if you need other versions, you can download OS X installers
> from python.org.
>
> > >http://www.python.org/download/releases/3.1.1/http://www.python.org/f...
> > > on/3.1.1/python-3.1.1.dmg
>
> > This tells me nothing.
>
> That's the disk image for the OS X Python 3.1.1 installer.  

But it doesn't say whether that disk image is compatible with
Snow Leopard and I don't take such things for granted.

> Official
> binary installers for OS X are provided on python.org for every final
> Python release.
>
> > > or (for MacPorts fans):
>
> > > $ sudo port install python31
>
> > And since I haven't got one, this also tells me nothing.
>
> http://www.macports.org/
>
> "The MacPorts Project is an open-source community initiative to design
> an easy-to-use system for compiling, installing, and upgrading either
> command-line, X11 or Aqua based open-source software on the Mac OS X
> operating system."

Ok, now I know. Thanks for the information.

>
> --
>  Ned Deily,
>  n...@acm.org

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Re: More stuff added to ch 2 of my programming intro

[Mensanator]

On Dec 17, 10:12 am, Benjamin Kaplan  wrote:
> On Thu, Dec 17, 2009 at 5:33 AM, Ned Deily  wrote:
>
> >> > or (for MacPorts fans):
>
> >> > $ sudo port install python31
>
> >> And since I haven't got one, this also tells me nothing.
>
> >http://www.macports.org/
>
> > "The MacPorts Project is an open-source community initiative to design
> > an easy-to-use system for compiling, installing, and upgrading either
> > command-line, X11 or Aqua based open-source software on the Mac OS X
> > operating system."
>
> Description sans marketing fluff: It's a Mac package manager. It's
> basically the same as Gentoo's portage if you've ever used that. It
> downloads source tarballs and patches and then compiles them locally.
> There are built-in lists of "variants", basically sets of configure
> args, to compile each package.

That's the kind of thing I want to hear.

Looks like I can go ahead and get a Mac and not worry about getting
3.1.1 installed.

Thanks.
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Re: More stuff added to ch 2 of my programming intro

[Mensanator]

On Dec 17, 1:40 am, geremy condra  wrote:
> On Thu, Dec 17, 2009 at 2:25 AM, Mensanator  wrote:
> > On Dec 16, 8:45 pm, Ned Deily  wrote:
> >> In article
> >> <88bab2c0-d27c-4081-a703-26b353b9e...@9g2000yqa.googlegroups.com>,
>
> >> Mensanator  wrote:
> >> > Oh, and about Chapter 1.
>
> >> > If you're going to use version 3.1.1 as your standard, shouldn't
> >> > you also point out that 3.1.1 is NOT bundled with Mac OS X?
>
> >> > How about devoting a section on downloading the source files
> >> > and compiling it on a Mac?
>
> >> Why would you do that?
>
> > Oh, I don't know, maybe because I'm thinking about
> > buying one and seeing 2.3, 2.4 and 2.5 directories
> > on the model in the store made me wary.
>
> >>http://www.python.org/download/releases/3.1.1/http://www.python.org/f...
>
> > This tells me nothing.
>
> >> or (for MacPorts fans):
>
> >> $ sudo port install python31
>
> > And since I haven't got one, this also tells me nothing.
>
> He just told you what it meant, as if it weren't already obvious.

Why would it be obvious? I use a PC, for which
$ sudo port install python31
is meaningless. Is MacPorts bundled with Snow Leopard?

Or do I have to do this first:

MacPorts version 1.8.1 is available in various formats for download
and installation (note, if you are upgrading your Mac OS X to a new
major release, see the migration info page):

“dmg” disk images for Snow Leopard, Leopard and Tiger as a legacy
platform, containing pkg installers for use with the Mac OS X
Installer. By far the simplest installation procedure that most users
should follow after meeting the requirements listed below.

In source form as either a tar.bz2 package or a tar.gz one for manual
compilation, if you intend to customize your installation in any way.

SVN checkout of the unpackaged sources, if you wish to follow MacPorts
development.

The selfupdate target of the port(1) command, for users who already
have MacPorts installed and wish to upgrade to a newer release.

Checksums for our packaged downloads are contained in the
corresponding checksums file.

Please note that in order to install and run MacPorts on Mac OS X,
your system must have installations of the following components:

Apple's Xcode Developer Tools (version 3.2.1 or later for Snow
Leopard, 3.1.4 or later for Leopard, or 2.5 for Tiger), found at the
Apple Developer Connection site or on your Mac OS X installation CDs/
DVD.

Ensure that the optional components for command line development are
installed ("Unix Development" in the Xcode 3.x installer).

The X11 windowing environment (A.K.A. “X11 User”) for ports that
depend on the functionality it provides to run.

The “X11 User” package is an optional installation on your system CDs/
DVD for Tiger, enabled through the “Customize” button of the
installer, whereas it is included by default on Leopard and Snow
Leopard.

You can use the xorg-server port instead of Apple's X11.app if you
wish.



>
> Geremy Condra

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Re: pyZui - anyone know about this?

[Donn]

On Thursday 17 December 2009 19:46:41 Terry Reedy wrote:
> His idea was for a document rather than 
> app centric plain. 
These days I find the notion of monolithic apps to be a pita. 
The concept of many small black boxes (but open source) that each do a single 
job and pipe in/out is so much more powerful. I don't see why everything in a 
gui and down can't be such a box. Then we get to wire them together as needed. 
We'd still have 'big apps' but they would be constructed more loosely and we 
could adapt them to fit real life needs.

I dunno. I think big apps are dinosaurs. As much as I love Inkscape and 
Blender and others, they are all islands with vast gulfs between them.

And let's have Python glue them all together!

> Not clear how one would pipe data from app to app in 
> his model, though.
The picture I have of it is illustrated by Blender's material node system. 
have a look at this pic:
http://upload.wikimedia.org/wikipedia/commons/2/26/Working_with_Nodes_Blender.PNG
Just a mental jump-off point. Think bash meets zui with a Python driving. :D

\d

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Re: PyArg_ParseTupleAndKeywords in Python3.1

[Joachim Dahl]

In the Ubuntu 9.10 version of Python 3.1 (using your patch), there's a
related bug:

>>> foo(b='b')

will set the value of a in the extension module to zero, thus clearing
whatever
default value it may have had.  In other words, the optional character
arguments
that are skipped seem to be nulled by PyArg_ParseTupleAndKeywords().
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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[Jonathan Hartley]

On Dec 17, 5:36 pm, Ross Ridge  wrote:
>  wrote:
> >Does anyone have any recommendations on which version of the
> >MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9)
> >based executable? (I assume I need just a matching pair of MSVCR90.DLL
> >and MSVCP90.DLL?)
>
> Either the one the came with your copy Microsoft Visual C++ or Python
> 2.6.4.  Otherwise, you don't have the legal right to redistribute
> Microsoft's code.
>
>                                         Ross Ridge
>
> --
>  l/  //   Ross Ridge -- The Great HTMU
> [oo][oo]  rri...@csclub.uwaterloo.ca
> -()-/()/  http://www.csclub.uwaterloo.ca/~rridge/
>  db  //  

Hi. I clearly haven't yet quite understood this very well.

Only this week I sent a py2exe-derived executable to someone else (a
non-developer) and it would not run on their WinXP machine ("'The
system cannot execute the specified program'") - my current favourite
hypothesis is that my omission of this dll or something similar was to
blame.

To diagnose what's wrong, I can't get access to the machine that gives
the above error. To try and reproduce, I'm right now in the process of
creating a bare-bones WindowsXP installed on a VM.

My questions are, sadly, legion:


1) I don't understand why the OP's question doesn't deserve a literal
answer - isn't one of those DLLs in the WinSxS directory derived from
his MSVC install? In which case does he have the rights to
redistribute it?


Ross said:
> Either the one the came with your copy Microsoft Visual C++ or Python 2.6.4.

2) The required dlls come with Python? Whatwhatwhat? Is this if I
download Python source to compile myself?

2b) Presumably these runtimes must come with Visual Studio express
edition (the free one.) I assume I can just prise the required DLL off
my filesystem after MSVS express edition has installed, rather than
insisting that my users run the MSVC runtime installer at

3) The wxpython site describes that I have to use a manifest file as
well as the DLLs, although I find no mention of the word 'manifest' on
www.py2exe.org, excepting a vaguely worded news item. Other sites (eg.
StackOverflow) report conflicting ideas of whether and when this
manifest file is needed. Is there a simple answer to whether this is
required?


4) The py2exe wiki says, of the msvc runtime dll version 7.1 (for
versions of Python prior to 2.6) that:

"Since most Windows installations nowadays include this DLL by
default, it may be unnecessary."

To what extent is this true? Does the same not also apply to the msvc
runtime 9.0 dll? (for Python 2.6.4)


Malcome said:
> (I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?)

5) Whatwhatwhat again? More than one DLL is required? Are there ever
any more than these two?


Sorry to be dense. Terse links to useful sources of information
appreciated. I've read the whole py2exe wiki and been googling the
last hour.

Jonathan
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Re: Raw string substitution problem

[MRAB]

Alan G Isaac wrote:

Alan G Isaac  wrote:
  >>>  re.sub('abc', r'a\nb\n.c\a','123abcdefg') == 
re.sub('abc', 'a\\nb\\n.c\\a','123abcdefg') == re.sub('abc', 
'a\nb\n.c\a','123abcdefg')

  True
Why are the first two strings being treated as if they are the last one?
 


On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:

They aren't.  The last string is different.


Of course it is different.
That is the basis of my question.
Why is it being treated as if it is the same?
(See the end of this post.)



Alan G Isaac  wrote:

More simply, consider::

  >>>  re.sub('abc', '\\', '123abcdefg')
  Traceback (most recent call last):
File "", line 1, in
File "C:\Python26\lib\re.py", line 151, in sub
  return _compile(pattern, 0).sub(repl, string, count)
File "C:\Python26\lib\re.py", line 273, in _subx
  template = _compile_repl(template, pattern)
File "C:\Python26\lib\re.py", line 260, in _compile_repl
  raise error, v # invalid expression
  sre_constants.error: bogus escape (end of line)

Why is this the proper handling of what one might think would be an
obvious substitution?



On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:

Is this what you want?  What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.

 re.sub('abc', r'\\', '123abcdefg')
> '123\\defg'


Turning again to the documentation:
"if it is a string, any backslash escapes in it are processed.
That is, \n is converted to a single newline character, \r is
converted to a linefeed, and so forth."
So why is '\n' converted to a newline but '\\' does not become a literal
backslash?  OK, I don't do much string processing, so perhaps this is where
I am missing the point: how is the replacement being "converted"?
(As Peter's example shows, if you supply the replacement via
a function, this does not happen.) You suggest it is just a matter of
it being an re, but::

>>> re.sub('abc', 'a\\nc','1abcd') == re.sub('abc', 'a\nc','1abcd')
True
>>> re.compile('a\\nc') == re.compile('a\nc')
False

So I have two string that are not the same, nor do they compile
equivalently, yet apparently they are "converted" to something
equivalent for the substitution. Why? Is my question clearer?


re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').

However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').

However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.


If the answer looks too obvious to state, assume I'm missing it anyway
and please state it.  As I said, I seldom use the re module.


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Re: iterators and views of lists

[Brendan Miller]

On Thu, Dec 17, 2009 at 8:41 AM, Anh Hai Trinh  wrote:
>> I have a couple of thoughts:
>> 1. Since [:] by convention already creates a copy, it might violate
>> people's expectations if that syntax were used.
>
> Indeed, listagent returns self on __getitem__[:]. What I meant was
> this:
>
>  x = [0, 1, 2, 3, 4, 5, 6, 7]
>  a = listagent(x)[::2]
>  a[:] = listagent(x)[::-2]
>
> And we get x = [7, 1, 5, 3, 3, 5, 1, 7], the copying happens in-place,
> of course.
>
>
>> 2. I'd give the listagent the mutable sequence interface
>
> Done!  I put the code in a repository here for those who might be
> interested:
> .
>
> In retrospect, the Python gurus here was right though. Copy, modify
> then replace is good enough, if not better since items are just
> pointers instead of values. For reversing, you need to translate all
> the indices (which cost exactly one addition and one multiplication
> per index). Is that cheaper than copying all the pointers to a new
> list?  For sorting, you definitely need to construct a lookup table
> since the sort algorithm needs to look over the indices multiple
> times, which means you are using two pointer indirections per index.
> Is that cheaper than just copying all the pointers to a new list? Even
> if there is any benefit at all, you'll need to implement listagent in
> C to squeeze it out.
>
> However, using listagents is faster if you just want a few items out
> of the slice. And it's cute.

Well, it doesn't really need to be any slower than a normal list. You
only need to use index and do extra additions because it's in python.
However, if listagent were written in C, you would just have a pointer
into the contents of the original list, and the length, which is all
that list itself has.

I don't actually expect you to write that, I'm just pointing it out.

As for copying pointers not taking much time... that depends on how
long the list is. if you are working with small sets of data, you can
do almost anything and it will be efficient. However, if you have
megabytes or gigabytes of data (say you are working with images or
video), than the difference between an O(1) or an O(n) operation is a
big deal.

I agree though, it doesn't matter to everyone and anyone. The reason I
was interested was because i was trying to solve some specific
problems in an elegant way. I was thinking it would be cool to make
python more usable in programming competitions by giving it its own
port of the STL's algorithm library, which needs something along the
lines of C++'s more powerful iterators.
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Re: Raw string substitution problem

[Alan G Isaac]

On 12/17/2009 2:45 PM, MRAB wrote:

re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').

However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').

However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.



OK, this is helpful.
(I did check equality but did not understand
I got True only because re used caching.)
So is the bottom line the following?
A string replacement is not just "converted"
as described in the documentation, essentially
it is compiled?

But that cannot quite be right.  E.g., \b will be a back
space not a word boundary.  So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the "obvious" conversion?

Thanks,
Alan Isaac
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Re: I have a cross platform os.startfile but I need to asociate files with xdg-open in linux how do I do that??

[eric_dex...@msn.com]

On Dec 16, 3:02 pm, "eric_dex...@msn.com"  wrote:
> On Dec 16, 10:36 am, Paul Boddie  wrote:
>
>
>
> > On 16 Des, 17:03, "eric_dex...@msn.com"  wrote:
>
> > > #this should be a cross platform example of os.startfile ( startfile )
> > > #for windows and linux.  this is the first version and
> > > #linux, mac, other os's commands for exceptions to the
> > > #rule would be appreciated.  at some point this will be
> > > #in the dex tracker project.
>
> > You could look at the desktop package for something similar:
>
> >http://pypi.python.org/pypi/desktop
>
> > The desktop.open function supports a few extra workarounds, mostly
> > because it pre-dates xdg-open.
>
> > Paul
>
> "Since desktop environments like KDE and GNOME provide mechanisms for
> running
> browsers and editors according to the identified type of a file or
> resource,
> just as Windows "runs" files or resources, it is appropriate to have a
> module
> which accesses these mechanisms. It is this kind of functionality that
> the
> desktop package aims to support. Note that this approach is arguably
> better"
>
> I am concerned this means I cant do something like associate python
> files with python in artistx (ubuntu).  It just associates text files
> with editors??  It does look like a cool package and I will look into
> that further.

I suppose I could test the extension..  if '.py' in filename and then
default to xdg-open if it isn't seems realy messy though.

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Re: How to create a self-destructing Tkinter dialog box?

[John Posner]

On Thu, 17 Dec 2009 02:09:03 -0500, Martin P. Hellwig  
 wrote:



mrstevegross wrote:

Ok, I would like to put together a Python/Tkinter dialog box that
displays a simple message and self-destructs after N seconds. Is there
a simple way to do this?
 Thanks,
 --Steve


Just, thinking aloud, I probably would do something like registering the  
[place|grid|pack]_forget() function by using the alarm callback  
'after()' function of that frame.




Yup, after() is your friend:

#---
from Tkinter import *
from functools import partial

def RemoveWindow(win):
win.destroy()

# root window
root = Tk()
Label(root, text="this is the main window").pack()

# another top-level window, to be removed in 2 seconds
top = Toplevel()
Label(top, text="this is the window to be removed").pack()
root.after(2000, partial(RemoveWindow, top))

# go
root.mainloop()
#---

HTH,
John
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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[Christian Heimes]

Jonathan Hartley wrote:
> Only this week I sent a py2exe-derived executable to someone else (a
> non-developer) and it would not run on their WinXP machine ("'The
> system cannot execute the specified program'") - my current favourite
> hypothesis is that my omission of this dll or something similar was to
> blame.
> 
> To diagnose what's wrong, I can't get access to the machine that gives
> the above error. To try and reproduce, I'm right now in the process of
> creating a bare-bones WindowsXP installed on a VM.

MSVCR90 is a side-by-side assembly (SxS). You can't just copy a SxS
assembly to another computer. You must at least ship the manifest file,
too. The easiest way to get your program running is the installation of
the MSVCR redistributable installer.

Christian

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Re: Raw string substitution problem

[MRAB]

Alan G Isaac wrote:

On 12/17/2009 2:45 PM, MRAB wrote:

re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').

However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').

However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.



OK, this is helpful.
(I did check equality but did not understand
I got True only because re used caching.)
So is the bottom line the following?
A string replacement is not just "converted"
as described in the documentation, essentially
it is compiled?

But that cannot quite be right.  E.g., \b will be a back
space not a word boundary.  So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the "obvious" conversion?


If you give the re module a string containing \b, eg. '\\b' or r'\b',
then it will compile it to a word boundary if it's in a regex string or
a backspace if it's in a replacement string. This is different from
giving the re module a string which actually contains a backspace, eg,
'\b'.

Because the re module uses backslashes for escaping, you'll need to
escape a literal backslash with a backslash in the string you give it.
But string literals also use backslashes for escaping, so you'll need to
escape each of those backslashes with a backslash.
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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[Ross Ridge]

Jonathan Hartley   wrote:
>1) I don't understand why the OP's question doesn't deserve a literal
>answer ...

I gave what I thought was a simple, direct and literal answer.

>.. isn't one of those DLLs in the WinSxS directory derived from
>his MSVC install?

I have no idea.  He might not even have Microsoft Visual C++ installed
on his machine. 

>2) The required dlls come with Python? Whatwhatwhat? 

The DLLs are required for Python to work, so yes the DLLs are included in
the official binary Python distribution for Windows. 

> Is this if I download Python source to compile myself?

No, the DLLs aren't included in the source distribution.  However, if
you compile the Python source yourself with a suitably licenced copy of
Microsoft Visual C++ then you'd be allowed to redistribute the Microsoft
Runtime DLLs as a part of your own binary Python distribution.

>2b) Presumably these runtimes must come with Visual Studio express
>edition (the free one.)

I'd assume so, but you should check the the terms of the EULA for that
particular product to make sure it also allows you to redistribute the
runtime DLLs.

> I assume I can just prise the required DLL off my filesystem after
>MSVS express edition has installed, rather than insisting that my users
>run the MSVC runtime installer at

It would problably simpler to use the DLL included in the "redist"
subdirectory of Microsoft Visual C++ installation.  That is, assumming
there is one, again you'll need to check the EULA.  Sometimes Microsoft
makes specific requirements on how its redistributables are packaged and
installed, and that definately seems to be the case with Visual C++ 2008.

>4) The py2exe wiki says, of the msvc runtime dll version 7.1 (for
>versions of Python prior to 2.6) that:
>
>"Since most Windows installations nowadays include this DLL by
>default, it may be unnecessary."
>
>To what extent is this true?

It's less true for newer versions of Windows.  I know there are a fair
number of people running Windows Vista and Windows 7 who've run into
problems with my own py2exe wrapped program because their machines don't
already have MSVCR71.DLL installed in their system directories.

>Does the same not also apply to the msvc
>runtime 9.0 dll? (for Python 2.6.4)

I'd assume the problem would be even worse.  I don't think Microsoft
allows the 9.0 runtime to be installed in system directory, so the
specific version of the runtime would need to be already installed the
WinSxS directory.

>Malcome said:
>> (I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?)
>
>5) Whatwhatwhat again? More than one DLL is required? Are there ever
>any more than these two?

The "P" DLL is for C++ and so the original poster may not actually need
it.  I'm pretty sure Python itself doesn't need it, and py2exe shouldn't
either, but wxPython, or more precisely wxWidgets, almost certainly does.
So in your case you'll probably need to redistribute both DLLs.

Ross Ridge

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read from bin file

[luca72]

I have a bin file that i read as:
in_file = open('primo.ske', 'rb')
leggo = luca.readlines()

i get a list like :
['\x00\x80p\x8b\x00\x00\x01\x19\x9b\x11\xa1\xa1\x1f\xc9\x12\xaf\x81!
\x84\x01\x00\x01\x01\x02\xff\xff\x80\x01\x03\xb0\x01\x01\x10m\x7f\n',
etc...]

but if i try to print  luca[0]
i get not the the string in the list but i get some like " 򀰉{"
how i can get a string like the string in the list?
Thanks Luca
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Re: read from bin file

[Jerry Hill]

On Thu, Dec 17, 2009 at 3:59 PM, luca72  wrote:
> I have a bin file that i read as:
> in_file = open('primo.ske', 'rb')
> leggo = luca.readlines()
>
> i get a list like :
> ['\x00\x80p\x8b\x00\x00\x01\x19\x9b\x11\xa1\xa1\x1f\xc9\x12\xaf\x81!
> \x84\x01\x00\x01\x01\x02\xff\xff\x80\x01\x03\xb0\x01\x01\x10m\x7f\n',
> etc...]
>
> but if i try to print  luca[0]
> i get not the the string in the list but i get some like " 򀰉{"
> how i can get a string like the string in the list?

print repr(luca[0])

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subprocess.Popen and ordering writes to stdout and stderr

[Chris Withers]

Hi All,

I have this simple function:

def execute(command):
process = Popen(command.split(),stderr=STDOUT,stdout=PIPE)
return process.communicate()[0]

..but my unit test for it fails:

from testfixtures import tempdir,compare
from unittest import TestCase

class TestExecute(TestCase):

@tempdir()
def test_out_and_err(self,d):
path = d.write('test.py','\n'.join((
"import sys",
"sys.stdout.write('stdout\\n')",
"sys.stderr.write('stderr\\n')",
"sys.stdout.write('stdout2\\n')",
)),path=True)
compare('stdout\nstderr\nstdout2\n',
execute(sys.executable+' '+path))

...because:

AssertionError:
@@ -1,4 +1,4 @@
-stdout
-stderr
-stdout2
+stdout
+stdout2
+stderr

...the order of the writes isn't preserved.
How can I get this to be the case?

Chris

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Re: ftplib timeout in Python 2.4

[r0g]

Nico Grubert wrote:
>> I don't know of one so you may need a workaround. What platforms do you
>> need to support?
> 
> Suse Linux Enterprise 10, 64 Bit with Python 2.4.4.
> I need the Python 2.4.4 for a running application Server (Zope).



OK, then one approach would be to use signals.alarm(timeout) to raise
SIGALRM and break out of your FTP function. Have a look at the example
at the very bottom of...

http://docs.python.org/library/signal.html

Roger.
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Re: subprocess.Popen and ordering writes to stdout and stderr

[exarkun]

On 09:15 pm, ch...@simplistix.co.uk wrote:

Hi All,

I have this simple function:

def execute(command):
process = Popen(command.split(),stderr=STDOUT,stdout=PIPE)
return process.communicate()[0]

..but my unit test for it fails:

from testfixtures import tempdir,compare
from unittest import TestCase

class TestExecute(TestCase):

@tempdir()
def test_out_and_err(self,d):
path = d.write('test.py','\n'.join((
"import sys",
"sys.stdout.write('stdout\\n')",
"sys.stderr.write('stderr\\n')",
"sys.stdout.write('stdout2\\n')",
)),path=True)
compare('stdout\nstderr\nstdout2\n',
execute(sys.executable+' '+path))

...because:

AssertionError:
@@ -1,4 +1,4 @@
-stdout
-stderr
-stdout2
+stdout
+stdout2
+stderr

...the order of the writes isn't preserved.
How can I get this to be the case?


You probably just need to flush stdout and stderr after each write.  You 
set them up to go to the same underlying file descriptor, but they still 
each have independent buffering on top of that.


Jean-Paul
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Re: subprocess.Popen and ordering writes to stdout and stderr

[Chris Withers]

exar...@twistedmatrix.com wrote:

How can I get this to be the case?


You probably just need to flush stdout and stderr after each write.  You 
set them up to go to the same underlying file descriptor, but they still 
each have independent buffering on top of that.


Okay, but if I do:

os.system(sys.executable+' '+path)

...with test.py as-is, I get things in the correct order.

How come?

Chris

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Re: subprocess.Popen and ordering writes to stdout and stderr

[exarkun]

On 09:56 pm, ch...@simplistix.co.uk wrote:

exar...@twistedmatrix.com wrote:

How can I get this to be the case?


You probably just need to flush stdout and stderr after each write. 
You set them up to go to the same underlying file descriptor, but they 
still each have independent buffering on top of that.


Okay, but if I do:

os.system(sys.executable+' '+path)

...with test.py as-is, I get things in the correct order.


libc is probably giving you line buffering when you use os.system 
(because the child process inherits the parent's stdio, and the parent's 
stdio is probably a pty, and that's the policy libc implements).


When you use subprocess.Popen, the child process gets a pipe (ie, not a 
pty) for its stdout/err, and libc gives you block buffering instead.


This makes the difference, since your test writes all end with \n - 
flushing the libc buffer when it's in line buffered mode, but not 
otherwise.


Try the os.system version with the parent process's stdio not attached 
to a pty (say, 'cat | program | cat') or try giving the subprocess.Popen 
version a pty of its own (I'm not sure how you do this with 
subprocess.Popen, though).  You should be able to observe the behavior 
change based on this.


Jean-Paul
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Re: subprocess.Popen and ordering writes to stdout and stderr

[Chris Withers]

exar...@twistedmatrix.com wrote:
libc is probably giving you line buffering when you use os.system 
(because the child process inherits the parent's stdio, and the parent's 
stdio is probably a pty, and that's the policy libc implements).




Interesting, but do these assertions still hold true when I tell you 
that I'm doing all this on Windows? ;-)


Chris

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Re: read from bin file

[Dave Angel]

Jerry Hill wrote:

On Thu, Dec 17, 2009 at 3:59 PM, luca72  wrote:
  

I have a bin file that i read as:
in_file =pen('primo.ske', 'rb')
leggo =uca.readlines()

i get a list like :
['\x00\x80p\x8b\x00\x00\x01\x19\x9b\x11\xa1\xa1\x1f\xc9\x12\xaf\x81!
\x84\x01\x00\x01\x01\x02\xff\xff\x80\x01\x03\xb0\x01\x01\x10m\x7f\n',
etc...]

but if i try to print  luca[0]
i get not the the string in the list but i get some like " 򀰉{"
how i can get a string like the string in the list?



print repr(luca[0])

  
You have several questions there. First, readlines() doesn't make sense 
if the file is binary. Unless you know that \n happens to be a delimiter 
in that particular formatted file, it makes more sense to just use 
read(), rather than readlines(). And in that case, you get a single 
string. You can specify how many bytes you want to read() each time.


Now when you print a list, print calls repr() on each item in the list. 
So Jerry is right that repr() is the direct answer to your question.


However, you may want a prettier output, such as that produced by 
binascii.hexlify(). A traditional dump file has hex bytes on one side, 
and printable characters on the other, with suitable spacing and such.


DaveA

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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?

[Mark Hammond]

On 18/12/2009 7:44 AM, Ross Ridge wrote:

The "P" DLL is for C++ and so the original poster may not actually need
it.  I'm pretty sure Python itself doesn't need it, and py2exe shouldn't
either, but wxPython, or more precisely wxWidgets, almost certainly does.
So in your case you'll probably need to redistribute both DLLs.


FYI, my experience is that an entire manifest must be distributed.  As 
the manifest in question actually lists 3 DLLs, IIUC, you must ship all 
4 files - the 3 DLLs and the manifest, even if only one of the DLLs is 
actually used.


This is from memory some time back though, so apologies in advance if 
I'm mis-remembering.


Mark
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Re: subprocess.Popen and ordering writes to stdout and stderr

[Mark Hammond]

On 18/12/2009 9:33 AM, Chris Withers wrote:

exar...@twistedmatrix.com wrote:

libc is probably giving you line buffering when you use os.system
(because the child process inherits the parent's stdio, and the
parent's stdio is probably a pty, and that's the policy libc implements).




Interesting, but do these assertions still hold true when I tell you
that I'm doing all this on Windows? ;-)


Yep.  You can see similar behaviour from just the cmd-prompt and the 
following script:


--
import sys
for i in range(10):
  print "stdout"
  print >> sys.stderr, "stderr"
--

If you execute it "normally" from a command-prompt, you will see things 
written in the correct order.  If you execute it like 'python foo.py > 
out 2>&1', the order will be mixed up.  If you execute it like 'python 
-u foo.py > out 2>&1' the order is restored.


HTH,

Mark
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Re: subprocess.Popen and ordering writes to stdout and stderr

[Terry Reedy]

On 12/17/2009 5:33 PM, Chris Withers wrote:

exar...@twistedmatrix.com wrote:

libc is probably giving you line buffering when you use os.system
(because the child process inherits the parent's stdio, and the
parent's stdio is probably a pty, and that's the policy libc implements).




Interesting, but do these assertions still hold true when I tell you
that I'm doing all this on Windows? ;-)


Which version /-)?

You can *fix* the test by sorting before comparing. If the app really 
requires synchronization of streams, I would just flush when needed and 
see if that were enough.


tjr



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Re: Raw string substitution problem

[Rhodri James]

On Thu, 17 Dec 2009 20:18:12 -, Alan G Isaac   
wrote:



So is the bottom line the following?
A string replacement is not just "converted"
as described in the documentation, essentially
it is compiled?


That depends entirely on what you mean.


But that cannot quite be right.  E.g., \b will be a back
space not a word boundary.  So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the "obvious" conversion?


'\\' *is* a backslash.  That string containing a single backslash is then  
processed by the re module which sees a backslash, tries to interpret it  
as an escape, fails and barfs.


"re.compile('a\\nc')" passes a sequence of four characters to re.compile:  
'a', '\', 'n' and 'c'.  re.compile() then does it's own interpretation:  
'a' passes through as is, '\' flags an escape which combined with 'n'  
produces the newline character (0x0a), and 'c' passes through as is.


"re.compile('a\nc')" by contrast passes a sequence of three character to  
re.compile: 'a', 0x0a and 'c'.  re.compile() does it's own interpretation,  
which happens not to change any of the characters, resulting in the same  
regular expression as before.


Your problem is that you are conflating the compile-time processing of  
string literals with the run-time processing of strings specific to re.


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Re: Seek support for new slice syntax PEP.

[Nobody]

On Mon, 14 Dec 2009 14:18:49 -0500, Terry Reedy wrote:

> Many more people uses range objects (xrange in 2.x). A range object has 
> the same info as a slice object *plus* it is iterable.

This isn't quite true, as a range cannot have a stop value of None, i.e.
you can't represent [n:] or [:] etc as a range. Similarly for using
negative stop values for indices relative to the end of the sequence being
sliced.

Also, aside from the semantics of slice objects themselves, slice notation
isn't limited to a single slice object; it can also return a tuple of
slices and values, e.g.:

> numpy.s_[1::2,...,3,4:5:6]
(slice(1, None, 2), Ellipsis, 3, slice(4, 5, 6))

For a single slice, enumerating over a slice with an unspecified stop
value would be equivalent to itertools.count(). Negative stop values won't
work.

For a multi-dimensional slice, with everything specified, you would
probably want to iterate over the cartesian product (i.e. N nested loops
for an N-dimensional slice). But this won't work if anything other than
the outermost loop has an unspecified stop value, or if you use an
ellipsis within a slice.

Oh, and being able to slice a slice could be quite useful, i.e.:

[10:90:10][2::2] == [30:90:20]

cf:
> numpy.arange(100)[10:90:10][2::2]
array([30, 50, 70])
> numpy.arange(100)[30:90:20]
array([30, 50, 70])

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Parsing file format to ensure file meets criteria

[seafoid]

Hi folks,

I am new to python and am having some trouble parsing a file.

I wish to parse a file and ensure that the format meets certain
restrictions.

The file format is as below (abbreviated):

c this is a comment
p wcnf 1468 817439 186181
286 32 0
186191 -198 -1098 0
186191 98 -1098 1123 0

Lines beginning c are comment lines and must precede all other lines.

Lines beginning p are header lines with the numbers being 'nvar', 'nclauses'
and 'hard' respectively.

All other lines are clause lines. These must contain at least two integers
followed by zero. There is no limit on the number of clause lines.

Header lines must precede clause lines.

In the above example:
nvar = 1468
nclauses = 817439
hard = 186191

Now for the interesting part...

The first number in a clause line = weight.
All else are literals.
Therefore, clause = weight + literals

weight <= hard
|literal| > 0
|literal| <= nvar
number of clause lines = nclauses

My attempts thus far have been a dismal failure, computing is so viciously
logical :confused:

My main problem is that below:

fname = raw_input('Please enter the name of the file: ')

z = open(fname, 'r')

z_list = [i.strip().split() for i in z]

#here each line is converted to a list, all nested within a list - all
elements of the list are strings, even integers are converted to strings

Question - how are nested lists indexed?

I then attempted to extract the comment, headers and clauses from the nested
list and assign them to a variable.

I tried:

for inner in z_list:
for lists in inner:
if lists[0] == 'c':
comment = lists[:]
elif lists[0] == 'p':
header = lists[:]
else:
clause = lists[:]
print comment, header, clause   

This does not work for some reasons which I understand. I have messed up the
indexing and my assignment of variables is wrong.

The aim was to extract the headers and comments and then be left with a
nested list of clauses.

Then I intended to converted the strings within the clauses nested list back
to integers and via indexing, check that all conditions are met. This would
have involved also converting the numerical strings within the header to
integers but the actual strings are proving a difficult problem to ignore.

Any suggestions?

If my mistakes are irritatingly stupid, please feel free to advise that I
r.t.f.m (read the f**king manual). However, thus far the manual has helped
me little.

Thanking you,
Seafoid.


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Re: Parsing file format to ensure file meets criteria

[MRAB]

seafoid wrote:

Hi folks,

I am new to python and am having some trouble parsing a file.

I wish to parse a file and ensure that the format meets certain
restrictions.

The file format is as below (abbreviated):

c this is a comment
p wcnf 1468 817439 186181
286 32 0
186191 -198 -1098 0
186191 98 -1098 1123 0

Lines beginning c are comment lines and must precede all other lines.

Lines beginning p are header lines with the numbers being 'nvar', 'nclauses'
and 'hard' respectively.

All other lines are clause lines. These must contain at least two integers
followed by zero. There is no limit on the number of clause lines.

Header lines must precede clause lines.

In the above example:
nvar = 1468
nclauses = 817439
hard = 186191

Now for the interesting part...

The first number in a clause line = weight.
All else are literals.
Therefore, clause = weight + literals

weight <= hard
|literal| > 0
|literal| <= nvar
number of clause lines = nclauses

My attempts thus far have been a dismal failure, computing is so viciously
logical :confused:

My main problem is that below:

fname = raw_input('Please enter the name of the file: ')

z = open(fname, 'r')

z_list = [i.strip().split() for i in z]

#here each line is converted to a list, all nested within a list - all
elements of the list are strings, even integers are converted to strings

Question - how are nested lists indexed?


A list is indexed by integers:

>>> my_list = ['a', 'b', 'c']
>>> my_list[0]
'a'

A list of lists requires 2 subscripts, one for the list and the other
for the list in that list:

>>> my_list = [['a', 'b'], ['c', 'd']]
>>> my_list[0]
['a', 'b']
>>> my_list[0][1]
'b'


I then attempted to extract the comment, headers and clauses from the nested
list and assign them to a variable.

I tried:


z_list is a list of lines, where each line is a list of words.

For example, is the file contains:

c this is a comment
p wcnf 1468 817439 186181

then z_list contains:

[['c', 'this', 'is', 'a', 'comment'], ['p', 'wcnf', '1468',
'817439', '186181']]


for inner in z_list:
for lists in inner:
if lists[0] == 'c':
comment = lists[:]
elif lists[0] == 'p':
header = lists[:]
else:
clause = lists[:]
print comment, header, clause   


This does not work for some reasons which I understand. I have messed up the
indexing and my assignment of variables is wrong.

The aim was to extract the headers and comments and then be left with a
nested list of clauses.

Then I intended to converted the strings within the clauses nested list back
to integers and via indexing, check that all conditions are met. This would
have involved also converting the numerical strings within the header to
integers but the actual strings are proving a difficult problem to ignore.

Any suggestions?

If my mistakes are irritatingly stupid, please feel free to advise that I
r.t.f.m (read the f**king manual). However, thus far the manual has helped
me little.


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Re: Parsing file format to ensure file meets criteria

[John Bokma]

seafoid  writes:

> Hi folks,
>
> I am new to python and am having some trouble parsing a file.

It really sounds like you need something that generates a parser for you
based on a grammar instead of trying to code your own parser.

See: http://wiki.python.org/moin/LanguageParsing
for an overview of modules.

-- 
John Bokma

Read my blog: http://johnbokma.com/
Hire me (Perl/Python): http://castleamber.com/
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Re: Parsing file format to ensure file meets criteria

[seafoid]

MRAB-2

Thank you for that!

Funny how something so simple clarifies a whole lot!

I will crack on now!

Once again,
Cheers and Thanks!

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Re: Parsing file format to ensure file meets criteria

[seafoid]

Hi John,

I considered that, but in an attempt to really figure out this supposedly
simple language, I figure that I should try and solve this.

I will check out the modules for future reference.

Thanks,
Seafoid :-)

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Re: More stuff added to ch 2 of my programming intro

[Ned Deily]

In article 
,
 Mensanator  wrote:
> > That's the disk image for the OS X Python 3.1.1 installer.  
> 
> But it doesn't say whether that disk image is compatible with
> Snow Leopard and I don't take such things for granted.

That's a good point.  There should be stated there somewhere about which 
operating systems are supported.  For the record, 3.1.1 has been tested 
on 10.4, 10.5, and 10.6 and should work on 10.3.9.

-- 
 Ned Deily,
 n...@acm.org

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Re: iterators and views of lists

[Steven D'Aprano]

On Thu, 17 Dec 2009 12:07:59 -0800, Brendan Miller wrote:

> I was thinking it would be cool to make python more usable in
> programming competitions by giving it its own port of the STL's
> algorithm library, which needs something along the lines of C++'s more
> powerful iterators.

For the benefit of those of us who aren't C++ programmers, what do its 
iterators do that Python's don't?


-- 
Steven
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ANN: Zeus for Windows IDE Version 3.97a

[JussiJ]

The latest 3.97a release of the Zeus for Windows IDE is
now available:

  http://www.zeusedit.com/whatsnew.html

Zeus is fully configurable, language neutral IDE.

It comes pre-configured with Python syntax highlighting
and code folding.

It is also possible to write Zeus scripts using Python.

Jussi Jumppanen
Author: Zeus for Windows
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imports in __init__.py

[Phil]

I use distutils / setup.py to install 'packagename', where...
/packagename
__init__.py
modulename.py

modulename.py has a class named 'classname'.

>From an arbitrary python module, I 'import packagename'.
In said module, I want to use the 'classname' class from
'packagename.modulename', by doing 'packagename.classname(params)'.

I have seen this done by having either 'import modulename' and/or
'from modulename import *' in 'packagename's __init__.py. I don't
really know which one or combination of them would work, but I can't
get it to work either way. Unless I am missing something, webpy does
this with, among other things, its application class that is in
application.py. From a new web app, you would just use web.application
(params).

I am using Python 3.1.1, although I don't think that should matter.

Any help is appreciated. Thanks!
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Re: imports in __init__.py

[Ben Finney]

Phil  writes:

> I use distutils / setup.py to install 'packagename', where...
> /packagename
> __init__.py
> modulename.py
>
> modulename.py has a class named 'classname'.

As per PEP 8, it's best if user-defined classes are named with
TitleCase, so ‘ClassName’.

> From an arbitrary python module, I 'import packagename'.

At that point, you have all the names that were defined within
‘packagename’, available inside the namespace ‘packagename’. Since
‘modulename’ is a module in that package, the module's namespace is
available to you via ‘packagename.modulename’.

> In said module, I want to use the 'classname' class from
> 'packagename.modulename', by doing 'packagename.classname(params)'.

The name ‘ClassName’ is not in the namespace ‘packagename’. It is in the
namespace ‘packagename.modulename’, so you'll need to access it there::

import packagename.modulename
packagename.modulename.ClassName(params)

You can import the class from that namespace explicitly::

from packagename.modulename import ClassName
ClassName(params)

or you can import the module from the package namespace::

from packagename import modulename
modulename.ClassName(params)

> I have seen this done by having either 'import modulename' and/or
> 'from modulename import *' in 'packagename's __init__.py.

Importing the module in the package would mean you would not have to
import the module yourself when using the package; it would not change
the qualification necessary of the namespace.

Importing using the ‘from foo import *’ form is usually a bad idea,
since it clobbers namespaces and makes it impossible to tell by looking
at the import code where the name ‘ClassName’ appeared from. Best to
import only explicit names, as above.

If you want to abbreviate, you can use the ability to rename while
importing::

import packagename.modulename as foo
foo.ClassName(params)

which keeps the names explicit and traceable.

-- 
 \   “Give a man a fish, and you'll feed him for a day; give him a |
  `\religion, and he'll starve to death while praying for a fish.” |
_o__)   —Anonymous |
Ben Finney
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Re: imports in __init__.py

[Phil]

I understand all of the above, including the reasons as to why this is
bad. For purposes of experimenting, I would still like to do it.

I guess I'm (still) wondering how it is done in webpy. I recall seeing
it done elsewhere too.

All I noticed was that in webpy's package 'web', it defines the
'application' class in 'application.py'.
And in web's __init__.py it has...
from application import *
And in whatever app you are creating, it has...
import web
app = web.application(params)

That being said, I can't get similar functionality with my own
package. Is there more to this? Within my package's __init__.py, I am
unable to import a module from the package without an import error.

Thanks again!
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ANN: withrestart 0.2.1

[Ryan Kelly]

Hi All,


  Apologies if you receive multiple copies of this, my python-announce
posts don't seem to be making it through.

  I've just released a new python module called "withrestart".  It's an
attempted Pythonisation of the restart-based condition system of Common
Lisp.  Details are on PyPI:

http://pypi.python.org/pypi/withrestart/0.2.1


  For an introduction to conditions and restarts, see "Beyond Exception
Handling" by Peter Seibel:

   
http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html


  For a quick demo of the module in action, keep reading...

  Cheers,

  Ryan



About withrestart:
--

Version:  0.2.1
Licence:  MIT
Source:   http://github.com/rfk/withrestart


withrestart is a Pythonisation (Lispers might rightly say "bastardisation") of
the restart-based condition system of Common Lisp.  It's designed to make error
recovery simpler and easier by removing the assumption that unhandled errors
must be fatal.

A "restart" represents a named strategy for resuming execution of a function
after the occurrence of an error.  At any point during its execution a
function can push a Restart object onto its call stack.  If an exception
occurs within the scope of that Restart, code higher-up in the call chain can
invoke it to recover from the error and let the function continue execution.
By providing several restarts, functions can offer several different strategies
for recovering from errors.

A "handler" represents a higher-level strategy for dealing with the occurrence
of an error.  It is conceptually similar to an "except" clause, in that one
establishes a suite of Handler objects to be invoked if an error occurs during
the execution of some code.  There is, however, a crucial difference: handlers
are executed without unwinding the call stack.  They thus have the opportunity
to take corrective action and then resume execution of whatever function
raised the error.

As an example, here's a function that doesn't like the number seven:

def anything_but_seven(v):
if v == 7:
raise ValueError("Argh!  A Seven!")
return v
 
And here's a function that can recover from the occurrence of a seven
using the pre-defined restarts "skip" and "use_value":

def sum_items(items):
total = 0
for i in items:
with restarts(skip,use_value) as invoke:
total += invoke(anything_but_seven,i)
return total

Naively calling this will raise a ValueError:

>>> sum_items(range(8))
Traceback (most recent call last):
...
ValueError: Argh! A Seven!
>>>

But if we handle ValueErrors by invoking the "skip" restart, we can
still get the sum of the remaining items:

>>> with Handler(ValueError,"skip"):
... sum_items(range(8))
... 
21
>>> 

Alternately, we can invoke the "use_value" restart to replace the sevens
with another value:

>>> with Handler(ValueError,"use_value",12):
... sum_items(range(8))
... 
33
>>> 

By splitting the responsibility for error recovery between Handlers and
Restarts, we can cleanly separate the low-level mechanics of recovering
from an error from the high-level decisions about what sort of recovery
to perform.



-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
r...@rfk.id.au|  http://www.rfk.id.au/ramblings/gpg/ for details





signature.asc
Description: This is a digitally signed message part
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Re: iterators and views of lists

[Brendan Miller]

On Thu, Dec 17, 2009 at 6:44 PM, Steven D'Aprano
 wrote:
> On Thu, 17 Dec 2009 12:07:59 -0800, Brendan Miller wrote:
>
>> I was thinking it would be cool to make python more usable in
>> programming competitions by giving it its own port of the STL's
>> algorithm library, which needs something along the lines of C++'s more
>> powerful iterators.
>
> For the benefit of those of us who aren't C++ programmers, what do its
> iterators do that Python's don't?

Python iterators basically only have one operation:

next(), which returns the next element or throws StopIteration.

In C++ terminology this is a Input iterator. It is good for writing
"for each" loops or map reduce operations.

An input iterator can't mutate the data it points to.

C++ also has progressively stronger iterators:
http://www.sgi.com/tech/stl/Iterators.html

InputIterator <- read only, one direction, single pass
ForwardIterator <- read/write, one direction, multi pass
BidirectionalIterator <- read/write, can move in either direction
RandomAccessIterator <- read/write, can move in either direction by an
arbitrary amount in constant time (as powerful as a pointer)

Each only adds extra operations over the one before. So a
RandomAccessIterator can be used anywhere a InputIterator can, but not
vice versa.

Also, this is a duck typing relationship, not a formal class
inheritance. Anything that quacks like a RandomAccessIterator is a
RandomAccessIterator, but there is no actual RandomAccessIterator
class.

So, for instance stl sort function takes pair of random access
iterator delimiting a range, and can sort any datastructure that can
provide that powerful of an iterator (arrays, vectors, deques).

http://www.sgi.com/tech/stl/sort.html

MyCollection stuff;
// put some stuff in stuff

sort(stuff.begin(), stuff.end());

Where begin() and end() by convention return iterators pointing to the
beginning and end of the sequence.
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Re: regex help

[S.Selvam]

On Wed, Dec 16, 2009 at 10:46 PM, Gabriel Rossetti <
gabriel.rosse...@arimaz.com> wrote:

> Hello everyone,
>
> I'm going nuts with some regex, could someone please show me what I'm doing
> wrong?
>
> I have an XMPP msg :
>
> 
>   
>   
>   123
>   456
>   
>   ...
>   
>   
> 
>
> the  node may be absent or empty (), the  node
> may be absent. I'd like to grab everything exept the  nod and
> create something new using regex, with the XMPP message example above I'd
> get this :
>
> 
>   
>   
>   123
>   456
>   
>   
>   
> 
>
> for some reason my regex doesn't work correctly :
>
> r"().*?( .*?>).*?(?:(.*?)|)?.*?()?"
>
>
If all you need is to remove payload node ,this could be useful,

s1="123456..."

pat=re.compile(r"")
s1=pat.sub("",s1)


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Re: Raw string substitution problem

[Gregory Ewing]

MRAB wrote:


Regular expressions and replacement strings have their own escaping
mechanism, which also uses backslashes.


This seems like a misfeature to me. It makes sense for
a regular expression to give special meanings to backslash
sequences, because it's a sublanguage with its own syntax.
But I can't see any earthly reason to do that with the
*replacement* string, which is just data.

It looks like a feature that's been blindly copied over
from Perl without thinking about whether it makes sense
in Python.

--
Greg
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share dictionary between processes

[blumenkraft]

Hi,

I want to share dictionary between two distinct processes.


Something like this:

first.py
import magic_share_module

def create_dictionary():
return {"a": 1}

magic_share_module.share("shared_dictionary",
creator.create_dictionary)
while True:
 pass


second.py
import magic_share_module
d = magic_share_module.get_shared("shared_dictionary")
print d["a"]

And then run in command line:
python first.py &
sleep 1
python second.py

I have looked at POSH, but it requires master process that will fork
childs. I want read-only sharing between completely unrelated
processes.
Is it possible?
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