Re: [Python-ideas] Make "is" checks on non-singleton literals errors
On Tue, Oct 9, 2012 at 1:14 PM, Guido van Rossum wrote: > Maybe we should do something more drastic and always create a new, > unique constant whenever a literal occurs as an argument of 'is' or > 'is not'? Then such code would never work, leading people to examine > their code more closely. I betcha we have people who could change the > bytecode compiler easily enough to do that. (I'm not seriously > proposing this, except as a threat of what we could do if the > SyntaxWarning is rejected. :-) That wouldn't guarantee that the code would never work, merely that the 'is' checks would be never true. Dangerous if the condition is a guard for an unusual condition. A unit test could of course catch it, but that assumes that everyone who writes "if x is 0" has tests probing both branches of that check... ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Unpaking Tuple
Dave Angel writes: > On 10/09/2012 02:07 AM, Bob Martin wrote: > > in 682592 20121008 232126 "Prasad, Ramit" wrote: [snip mess] > > How does one unpack this post? ;-) > > Since that's not the way it arrived here, i have to ask, how do you > get these posts? Are you subscribed to individual messages by email > via python.org? or are you using google-groups or some other > indirection? > > In any reasonable mail program, you can see the source of a message. > Most of the troubles i've seen here have been caused by people > trying to send html mail to a text-based mailing list. But in the > case you quote, the original message came here as text/plain, and > well formatted. I see a carriage return rendered as ^M at the end of every line from Prasad's messages. Other than that, they are well-formatted plain text for me, too. I guess Prasad's system sends \r\n instead of \n\r (the DOS line-end) and \r\n gets interpreted as a stray \r followed by end-of-line. -- http://mail.python.org/mailman/listinfo/python-list
Re: Blue Screen Python
Il giorno venerdì 21 settembre 2012 16:04:48 UTC+2, mikcec82 ha scritto: > Hallo to all, > > > > I'm using Python 2.7.3 with Windows 7 @ 64 bit > > and an Intel Core i3 -2350M CPU @2.30GHz 2.3GHz. > > > > Sometimes, when I'm programming in Python on my screen compare this blue > screen: > > http://imageshack.us/a/img228/8352/48579647436249494527021.jpg > > > > Can you help on what is the issue, and how I can solve it? > > > > If you need more info I'm available. > > > > Thank you so much, > > Michele Hi to all, and thanks for your answers. I'm not using a buggy library. Yesterday I have another BSOD...but I was using only "OS" library. I have also tested memory using memtest, but there wasn't errors. In my script I open and close an html (in a FOR cycle); could be this the problem? Or is it possible that Python 2.7 is not compatible with Win7? Thank you very much to you. Have a good day, Michele -- http://mail.python.org/mailman/listinfo/python-list
FW: question Python custome events
Hi, Is it possible to define an Event which should fire when a value of a variable changes? Something like below self.Bind(wx.EVT_ON_VAL_CHANGE, variable_to_watch, self.Callback) I need a Text ctrl UI which continuously changes values based on external data changes. Unfortunately I could not find events in Python which can be triggered when a variable value changes? Please let me know how this can be achieved? Thanks, Hussain -- http://mail.python.org/mailman/listinfo/python-list
Re: Blue Screen Python
On 10/09/2012 09:37 AM, mikcec82 wrote: > In my script I open and close an html (in a FOR cycle); could be this the > problem? Unless you're running your Python script as a kernel driver (and you can't do that accidentally), there is no way that your user-space program should cause a bluescreen. This is an error in Windows (or one of the drivers), not in Python or your program. What you can do is insert your Windows DVD, boot from it, and click Repair. > Or is it possible that Python 2.7 is not compatible with Win7? No, even if a user-space program could legitimately cause a bluescreen, Python 2.7 still works fine one thousands of Win7 machines. Cheers, Philipp signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: mangled messages (was: Unpaking Tuple)
On 10/09/12 02:22, Jussi Piitulainen wrote: >>> in 682592 20121008 232126 "Prasad, Ramit" wrote: > [snip mess] >>> How does one unpack this post? ;-) >> >> Since that's not the way it arrived here, i have to ask, how do you >> get these posts? > > I see a carriage return rendered as ^M at the end of every line from > Prasad's messages. Other than that, they are well-formatted plain text > for me, too. > > I guess Prasad's system sends \r\n instead of \n\r (the DOS line-end) > and \r\n gets interpreted as a stray \r followed by end-of-line. Prasad's system is correctly sending the "right" order (DOS line-ends are CR+LF = \r\n, not the other way around). However, it might be that there is no CR+LF on the last line, or that one line is missing the CR, so your viewer heuristic (vim does this) thinks it has Unix NL-only line-endings and shows the ^M on all the lines that have the CR. All for one stray line without. Prasad's email came through cleanly here (gmane + Thunderbird). -tkc -- http://mail.python.org/mailman/listinfo/python-list
pydelicious documentation
Does somebody know where I can get the documentation for pydelicious?
The documentation links ("For code documentation
see doc/pydelicious or doc/dlcs.py.") in
http://packages.python.org/pydelicious/README.html#id3
gave me
404 Not Found
nginx/1.1.19
Prof. Dr. Andrés Soto
--
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Re: + in regular expression
Cameron Simpson wrote:
>| Because "\s{6}+"
>| has other meanings in different regex syntaxes and the designers didn't
>| want confusion?
>
> I think Python REs are supposed to be Perl compatible; ISTR an opening
> sentence to that effect...
>
I don't know the full history of how regex engines evolved, but I suspect
at least part of the answer is that the decisions the Perl developers made
influenced the other implementations.
Perl's quantifiers allow both '?' and '+' as modifiers on the standard
quantifiers so clearly you cannot stack those particular quantifiers in
Perl, therefore quantifiers in general are unstackable.
The only grammars I can find online for regular expressions split out the
elements and quantifiers the way I did in my previous post. Python's regex
parser (and I would guess also most of the others in existence) tend more
to the spaghetti code than following a grammar (_parse is a 238 line
function). So I think it really is just trying to match existing regular
expression parsers and any possible grammar is an excuse for why it should
be the way it is rather than an explanation.
--
Duncan Booth http://kupuguy.blogspot.com
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Re: To get the accurate value of 1 - 0.999999999999999 ,how to implement the python algorithm ？
On Tue, 09 Oct 2012 02:00:04 +1100, Chris Angelico wrote: > On Tue, Oct 9, 2012 at 1:48 AM, Dave Angel wrote: >> import decimal >> a = decimal.Decimal(4.3) >> print(a) >> >> 5.0996447286321199499070644378662109375 > > Ah, the delights of copy-paste :) > >> The Decimal class has the disadvantage that it's tons slower on any >> modern machine I know of... > > Isn't it true, though, that Python 3.3 has a completely new > implementation of decimal that largely removes this disadvantage? Yes. It's blazingly fast: up to 120 times faster than the pure Python version, and within an order of magnitude of the speed of binary floats: [steve@ando ~]$ python3.3 -m timeit -s "x, y = 1001.0, 978.0" > "x+y-(x/y)**4" 100 loops, best of 3: 0.509 usec per loop [steve@ando ~]$ python3.3 -m timeit -s "from decimal import Decimal" > -s "x, y = Decimal(1001), Decimal(978)" "x+y-(x/y)**4" 10 loops, best of 3: 3.58 usec per loop Without hardware support, Decimal will probably never be quite as fast as binary floats, but its fast enough for all but the most demanding needs. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Insert item before each element of a list
mooremath...@gmail.com wrote:
> What's the best way to accomplish this? Am I over-complicating it?
> My gut feeling is there is a better way than the following:
>
import itertools
x = [1, 2, 3]
y = list(itertools.chain.from_iterable(('insertme', x[i]) for i in
range(len(x y
> ['insertme', 1, 'insertme', 2, 'insertme', 3]
>
> I appreciate any and all feedback.
>
Given the myriad of proposed solutions, I'm surprised nobody has suggested
good old list slicing:
>>> x = [1,2,3]
>>> y = ['insertme']*(2*len(x))
>>> y[1::2] = x
>>> y
['insertme', 1, 'insertme', 2, 'insertme', 3]
--
Duncan Booth
--
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Re: pydelicious documentation
Hi Professor Soto,
Not sure what's going on with their servers', but I was able to find
the documentation on their repo:
https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/index.html
https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/HACKING.html
https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/dlcs.html
https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/pydelicious.html
Just save the files locally then open them in your browser.
All the best,
Alec Taylor
On Tue, Oct 9, 2012 at 10:06 PM, Andres Soto wrote:
> Does somebody know where I can get the documentation for pydelicious?
> The documentation links ("For code documentation see doc/pydelicious or
> doc/dlcs.py.") in http://packages.python.org/pydelicious/README.html#id3
> gave me
>
> 404 Not Found
>
>
> nginx/1.1.19
>
> Prof. Dr. Andrés Soto
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
--
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Re: pydelicious documentation
Actually it seems this project has been official abandoned.
Unofficially use this, was updated only a month ago:
https://github.com/mgan59/python-pinboard
On Tue, Oct 9, 2012 at 10:47 PM, Alec Taylor wrote:
> Hi Professor Soto,
>
> Not sure what's going on with their servers', but I was able to find
> the documentation on their repo:
>
> https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/index.html
> https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/HACKING.html
> https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/dlcs.html
> https://pydelicious.googlecode.com/svn/trunk/doc/htmlref/pydelicious.html
>
> Just save the files locally then open them in your browser.
>
> All the best,
>
> Alec Taylor
>
> On Tue, Oct 9, 2012 at 10:06 PM, Andres Soto wrote:
>> Does somebody know where I can get the documentation for pydelicious?
>> The documentation links ("For code documentation see doc/pydelicious or
>> doc/dlcs.py.") in http://packages.python.org/pydelicious/README.html#id3
>> gave me
>>
>> 404 Not Found
>>
>>
>> nginx/1.1.19
>>
>> Prof. Dr. Andrés Soto
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
--
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Creating a dictionary
below is the text file i have How to create Facility as a key and then assign multiple values to it FACILITY : BACKUP FAILED BACKUP_BEFORE FAILED BACKUP_INTERCHANGE Total : 34 Passed : 32 Failed : 2 Not Run : 0 FACILITY : CDU Total : 9 Passed : 9 Failed : 0 for example Facility BACKUP is a key & its values are Total Passed, Failed Not Run and Facility CDU as a key & its values Total:9,Passed:9,Failed:0 etc... -- http://mail.python.org/mailman/listinfo/python-list
Re: Insert item before each element of a list
On Mon, 08 Oct 2012 19:34:26 -0700, rusi wrote:
> How about a 2-paren version?
>
x = [1,2,3]
reduce(operator.add, [['insert', a] for a in x])
> ['insert', 1, 'insert', 2, 'insert', 3]
That works, but all those list additions are going to be slow. It will be
an O(N**2) algorithm.
If you're going to be frequently interleaving sequences, a helper
function is a good solution. Here's my muxer:
def mux(*iterables):
"""Muxer which yields items interleaved from each iterator or
sequence argument, stopping when the first one is exhausted.
>>> list( mux([1,2,3], range(10, 15), "ABCD") )
[1, 10, 'A', 2, 11, 'B', 3, 12, 'C']
"""
for i in itertools.izip(*iterables): # in Python 3 use builtin zip
for item in i:
yield item
Then call it like this:
py> list(mux(itertools.repeat("insert me"), range(5)))
['insert me', 0, 'insert me', 1, 'insert me', 2, 'insert me', 3, 'insert
me', 4]
--
Steven
--
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Re: mangled messages (was: Unpaking Tuple)
Tim Chase writes: > On 10/09/12 02:22, Jussi Piitulainen wrote: > >>> in 682592 20121008 232126 "Prasad, Ramit" wrote: > > [snip mess] > >>> How does one unpack this post? ;-) > >> > >> Since that's not the way it arrived here, i have to ask, how do you > >> get these posts? > > > > I see a carriage return rendered as ^M at the end of every line from > > Prasad's messages. Other than that, they are well-formatted plain text > > for me, too. > > > > I guess Prasad's system sends \r\n instead of \n\r (the DOS line-end) > > and \r\n gets interpreted as a stray \r followed by end-of-line. > > Prasad's system is correctly sending the "right" order (DOS > line-ends are CR+LF = \r\n, not the other way around). You are right. I managed to confuse myself about the order of the two characters while staring on a source that says the opposite of what I said (http://en.wikipedia.org/wiki/Newline). Doubly sorry about the noise (being both off-topic and incorrect). > However, it might be that there is no CR+LF on the last line, or > that one line is missing the CR, so your viewer heuristic (vim does > this) thinks it has Unix NL-only line-endings and shows the ^M on > all the lines that have the CR. All for one stray line without. That doesn't sound robust. The problem is still quite rare for me. > Prasad's email came through cleanly here (gmane + Thunderbird). I'm on Gnus in Emacs, probably a few years out of date. -- http://mail.python.org/mailman/listinfo/python-list
Re: Blue Screen Python
Il giorno venerdì 21 settembre 2012 16:04:48 UTC+2, mikcec82 ha scritto: > Hallo to all, > > > > I'm using Python 2.7.3 with Windows 7 @ 64 bit > > and an Intel Core i3 -2350M CPU @2.30GHz 2.3GHz. > > > > Sometimes, when I'm programming in Python on my screen compare this blue > screen: > > http://imageshack.us/a/img228/8352/48579647436249494527021.jpg > > > > Can you help on what is the issue, and how I can solve it? > > > > If you need more info I'm available. > > > > Thank you so much, > > Michele Thank you so much Philipp. Now I am at work and I can't insert Windows DVD, but as soon as possible I'll done as you said and report you if the problem is solved or not. Best regards, Michele -- http://mail.python.org/mailman/listinfo/python-list
Re: Insert item before each element of a list
Duncan Booth wrote:
> mooremath...@gmail.com wrote:
>
>> What's the best way to accomplish this? Am I over-complicating it?
>> My gut feeling is there is a better way than the following:
>>
> import itertools
> x = [1, 2, 3]
> y = list(itertools.chain.from_iterable(('insertme', x[i]) for i in
> range(len(x y
>> ['insertme', 1, 'insertme', 2, 'insertme', 3]
>>
>> I appreciate any and all feedback.
>>
>
> Given the myriad of proposed solutions, I'm surprised nobody has suggested
> good old list slicing:
My post on gmane
http://thread.gmane.org/gmane.comp.python.general/718940/focus=718947
apparently didn't make it through to the list.
x = [1,2,3]
y = ['insertme']*(2*len(x))
y[1::2] = x
y
> ['insertme', 1, 'insertme', 2, 'insertme', 3]
An advantage of this approach -- it is usually much faster.
--
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Re: Creating a dictionary
On Tue, 09 Oct 2012 04:59:49 -0700, argbsk wrote:
> below is the text file i have How to create Facility as a key and then
> assign multiple values to it
To use Facility as a key in a dict:
d = {}
d['Facility'] = 'ham'
Note that keys are case-sensitive, so that 'Facility', 'facility',
'FACILITY' and 'FaCiLiTy' are all different.
To have multiple values assigned to a key, use a list:
d['Facility'] = ['ham', 'spam', 'cheese', 'eggs']
d['Facility'].append('tomato')
--
Steven
--
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Re: Creating a dictionary
In article <50741ffe$0$6574$c3e8da3$54964...@news.astraweb.com>,
Steven D'Aprano wrote:
> On Tue, 09 Oct 2012 04:59:49 -0700, argbsk wrote:
>
> > below is the text file i have How to create Facility as a key and then
> > assign multiple values to it
>
> To use Facility as a key in a dict:
>
> d = {}
> d['Facility'] = 'ham'
>
> Note that keys are case-sensitive, so that 'Facility', 'facility',
> 'FACILITY' and 'FaCiLiTy' are all different.
>
> To have multiple values assigned to a key, use a list:
>
> d['Facility'] = ['ham', 'spam', 'cheese', 'eggs']
> d['Facility'].append('tomato')
I think what he really wants to end up with is a dictionary of
dictionaries:
{'BACKUP': {'Total' : 34,
'Passed' : 32,
'Failed' : 2,
'Not Run' : 0
},
'CDU': {}
}
Or, somewhat more work, but a richer solution, create a FacilityData
class, whose attributes are total, passed, failed, not_run, etc, and
have instances of FacilityData be the values.
--
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Re: Creating a dictionary
Am 09.10.2012 13:59, schrieb arg...@gmail.com: below is the text file i have How to create Facility as a key and then assign multiple values to it The value part of a dict element can be any kind of object, like e.g. a tuple, namedtuple or even a dict. Uli -- http://mail.python.org/mailman/listinfo/python-list
RE: Fastest web framework
How fast python web framework process routing (URL dispatch)? Here is a benchmark for various web frameworks (bottle, django, flask, pyramid, tornado and wheezy.web) running the following routing: static, dynamic, SEO and missing... with a trivial 'hello world' application (all routes are pointing to the same handler). http://mindref.blogspot.com/2012/10/python-web-routing-benchmark.html Benchmark is executed in isolated environment using CPython 2.7. Comments or suggestions are welcome. Thanks. Andriy Kornatskyy > From: andriy.kornats...@live.com > To: python-list@python.org > Subject: Fastest web framework > Date: Sun, 23 Sep 2012 12:19:16 +0300 > > > I have run recently a benchmark of a trivial 'hello world' application for > various python web frameworks (bottle, django, flask, pyramid, web.py, > wheezy.web) hosted in uWSGI/cpython2.7 and gunicorn/pypy1.9... you might find > it interesting: > > http://mindref.blogspot.com/2012/09/python-fastest-web-framework.html > > Comments or suggestions are welcome. > > Thanks. > > Andriy Kornatskyy > > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Private methods
On 09/10/2012 14:24, D.M. Procida wrote: What exactly is the point of a private method? Why or when would I want to use one? Daniele Hardly a Python question but using a search engine could have got you here, and rather faster :) http://stackoverflow.com/questions/2620699/why-private-methods-in-the-object-oriented -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: Private methods
Mark Lawrence wrote: > On 09/10/2012 14:24, D.M. Procida wrote: > > What exactly is the point of a private method? Why or when would I want > > to use one? > > > > Daniele > > > > Hardly a Python question but using a search engine could have got you > here, and rather faster :) > http://stackoverflow.com/questions/2620699/why-private-methods-in-the-ob ject-oriented Thanks. Sometimes I prefer to talk to real people on Usenet than do web searches. Just my preference. Anyway, one of the answers on that page explains that public methods are interfaces to a class, that other things might rely on, and private ones are for its own internal logic, that other things don't need to care about. In Python, using an underscore is simply a convention to note that a method is private - it doesn't actually hide it from other things - correct? Daniele -- http://mail.python.org/mailman/listinfo/python-list
string contains and special characters
I am trying to match a string that containing the "<" and ">" characters, using
the string contains function, but it never seems to find the lines containing
the string
e.g if mystring.contains("") :
Do I need to escape the characters...and if so how?
--
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Re: Private methods
On 12-10-09 06:59 AM, D.M. Procida wrote: In Python, using an underscore is simply a convention to note that a method is private - it doesn't actually hide it from other things - correct? Daniele A single underscore semantically means private. A double underscore will name mangle the function such that it's only accessible strictly by name through the class that it's define in. Note that you *can* still access it if you understand how name mangling works. Nothing in Python is truly private. -- Demian Brecht @demianbrecht http://demianbrecht.github.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Insert item before each element of a list
On Monday, October 8, 2012 10:06:50 PM UTC-4, Roy Smith wrote:
> In article ,
>
(big snip)
>
>
> > y = list(itertools.chain.from_iterable(('insertme', x[i]) for i in
> > range(len(x
>
>
>
> A statement ending in four close parens is usually going to be pretty
>
> difficult to figure out. This is one where I had to pull out my pencil
>
> and start pairing them off manually to figure out how to parse it.
Fair enough. I admit I was looking for a tricky one-liner, which rarely leads
to good code...I should know better.
Thanks for all the feedback from everyone. It's amazing how much Python one
can learn just asking about a small section of code!
--
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Re: Private methods
On 10/9/12 2:59 PM, D.M. Procida wrote: Mark Lawrence wrote: On 09/10/2012 14:24, D.M. Procida wrote: What exactly is the point of a private method? Why or when would I want to use one? Daniele Hardly a Python question but using a search engine could have got you here, and rather faster :) http://stackoverflow.com/questions/2620699/why-private-methods-in-the-ob ject-oriented Thanks. Sometimes I prefer to talk to real people on Usenet than do web searches. Just my preference. That's understandable, but the real people on Usenet who will answer your questions usually prefer that you do a web search first, for a variety of reasons. http://www.catb.org/esr/faqs/smart-questions.html#before Anyway, one of the answers on that page explains that public methods are interfaces to a class, that other things might rely on, and private ones are for its own internal logic, that other things don't need to care about. In Python, using an underscore is simply a convention to note that a method is private - it doesn't actually hide it from other things - correct? This is correct. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Unpaking Tuple
On 2012-10-09, Bob Martin wrote: > in 682592 20121008 232126 "Prasad, Ramit" wrote: >>Thomas Bach wrote:=0D=0A> Hi there,=0D=0A> =0D=0A> On Sat, Oct 06, 2012 at = >>03:08:38PM +, Steven D'Aprano wrote:=0D=0A> >=0D=0A> > my_tuple =3D my_= >>tuple[:4]=0D=0A> > a,b,c,d =3D my_tuple if len(my_tuple) =3D=3D 4 else (my_= > > How does one unpack this post? ;-) Yea, my newsreader doesn't like those posts either -- though they're not as bad as what yours displays. Mine just shows "^M" strings all at the end of every line. -- Grant Edwards grant.b.edwardsYow! BARBARA STANWYCK makes at me nervous!! gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: string contains and special characters
On 10/09/2012 04:02 PM, loial wrote:
> I am trying to match a string that containing the "<" and ">" characters,
> using the string contains function, but it never seems to find the lines
> containing the string
>
> e.g if mystring.contains("") :
>
> Do I need to escape the characters...and if so how?
>
if '' in yourstring:
# your code
--
Agon Hajdari
--
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Re: Private methods
On 10/09/12 08:59, D.M. Procida wrote: >> On 09/10/2012 14:24, D.M. Procida wrote: >>> What exactly is the point of a private method? Why or when would I want >>> to use one? > > In Python, using an underscore is simply a convention to note that a > method is private - it doesn't actually hide it from other things - > correct? Correct. You can read the leading underscore as "if you use this, don't come crying if it breaks on you in a future version because we changed an internal implementation. We told you so." -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: string contains and special characters
On 10/09/2012 10:02 AM, loial wrote:
> I am trying to match a string that containing the "<" and ">" characters,
> using the string contains function, but it never seems to find the lines
> containing the string
>
> e.g if mystring.contains("") :
>
> Do I need to escape the characters...and if so how?
>
What language are you trying to use, and what version of that language?
In all the Python versions I know of, that line would simply be a syntax
error. There's no "contains" method in the str class, use the 'in' keyword.
if "' in mystring:
No need to escape any ASCII characters except backslash.
--
DaveA
--
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Re: mangled messages
On 10/09/12 07:05, Jussi Piitulainen wrote: > Tim Chase writes: >> However, it might be that there is no CR+LF on the last line, >> or that one line is missing the CR, so your viewer heuristic >> (vim does this) thinks it has Unix NL-only line-endings and >> shows the ^M on all the lines that have the CR. All for one >> stray line without. > > That doesn't sound robust. The problem is still quite rare for > me. Vim's heuristic is that, if *all* the lines end in CR+LF, it's a DOS-formatted file; otherwise it's a Unix-style (LF) file with spurious CRs in it (they just happen to come at the end of most-but-not-all lines). It works quite robustly, since writing the file back out will reliably put the CRs back where they were and leave the non-CR'ed lines as they were with only LF. Vim makes it pretty easy to remove the spurious CRs and then change the file-format from Unix to DOS line-endings and write it out if that's what you want[1]. -tkc [1] :%s/\r$ :set ff=dos :w which (1) removes the spurious/inconsistent CRs, (2) tells vim that newlines should be written as CR+LF when writing and (3) writes the file back out to disk. -- http://mail.python.org/mailman/listinfo/python-list
Re: string contains and special characters
On 10/09/2012 10:23 AM, Dave Angel wrote:
> On 10/09/2012 10:02 AM, loial wrote:
>> I am trying to match a string that containing the "<" and ">" characters,
>> using the string contains function, but it never seems to find the lines
>> containing the string
>>
>> e.g if mystring.contains("") :
>>
>> Do I need to escape the characters...and if so how?
>>
> What language are you trying to use, and what version of that language?
> In all the Python versions I know of, that line would simply be a syntax
Sorry, I should have said "Attribute" error.
> error. There's no "contains" method in the str class, use the 'in' keyword.
>
> if "' in mystring:
>
> No need to escape any ASCII characters except backslash.
>
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Re: string contains and special characters
On Tue, Oct 9, 2012 at 10:02 AM, loial wrote:
> I am trying to match a string that containing the "<" and ">" characters,
> using the string contains function, but it never seems to find the lines
> containing the string
>
> e.g if mystring.contains("") :
>
> Do I need to escape the characters...and if so how?
Strings don't have a contains() method. Assuming that mystring is
actually a string, you should be getting a very specific error,
telling you exactly what's wrong with your code (something like
AttributeError: 'str' object has no attribute 'contains').
If that isn't what you're seeing, you'll need to provide the full and
complete text of the error you are getting, and preferably enough of
your code that we can reproduce the issue and help you solve it.
--
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Re: string contains and special characters
On 09/10/2012 15:23, Dave Angel wrote:
On 10/09/2012 10:02 AM, loial wrote:
I am trying to match a string that containing the "<" and ">" characters, using
the string contains function, but it never seems to find the lines containing the string
e.g if mystring.contains("") :
Do I need to escape the characters...and if so how?
What language are you trying to use, and what version of that language?
In all the Python versions I know of, that line would simply be a syntax
error. There's no "contains" method in the str class, use the 'in' keyword.
I see you've already corrected youself :)
if "' in mystring:
No need to escape any ASCII characters except backslash.
No need to escape anything if raw strings are used.
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Mark Lawrence.
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Re: string contains and special characters
On Tuesday, 9 October 2012 15:19:33 UTC+1, Agon Hajdari wrote:
> On 10/09/2012 04:02 PM, loial wrote: > I am trying to match a string that
> containing the "<" and ">" characters, using the string contains function,
> but it never seems to find the lines containing the string > > e.g if
> mystring.contains("") : > > Do I need to escape the characters...and if
> so how? > if '' in yourstring: # your code -- Agon Hajdari
That worked...thanks
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surprising behaviour of global dictionaries
I have the following module implementing a registry of functions with a
decorator:
$ cat x.py
registry = {} # global dictionary
def dec(func):
registry[func.__name__] = func
print registry, id(registry)
return func
if __name__ == '__main__':
import xlib
print registry, id(registry)
The library xlib just defines two dummy functions:
$ cat xlib.py
from x import dec
@dec
def f1():
pass
@dec
def f2():
pass
Then I get the following output:
$ python x.py
{'f1': } 27920352
{'f1': , 'f2': }
27920352
{} 27395472
This is surprising since I would expect to have a single global dictionary, not
two: how comes the registry inside the ``if __name__ == '__main__'`` block is
different from the one seen in the library?
This is python 2.7.3 on Ubuntu.
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Re: string contains and special characters
Am 09.10.2012 16:02, schrieb loial:
I am trying to match a string that containing the "<" and ">"
characters, using the string contains function, but it never seems to
find the lines containing the string
e.g if mystring.contains("") :
I can't locate a 'contains' function anywhere, what type is 'mystring'?
Do I need to escape the characters...and if so how?
Maybe. Please provide some example code that unexpectedly fails.
Uli
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Re: surprising behaviour of global dictionaries
Michele Simionato wrote:
> I have the following module implementing a registry of functions with a
> decorator:
>
> $ cat x.py
> registry = {} # global dictionary
>
> def dec(func):
> registry[func.__name__] = func
> print registry, id(registry)
> return func
>
> if __name__ == '__main__':
> import xlib
> print registry, id(registry)
>
> The library xlib just defines two dummy functions:
>
> $ cat xlib.py
> from x import dec
>
> @dec
> def f1():
> pass
>
> @dec
> def f2():
> pass
>
> Then I get the following output:
>
> $ python x.py
> {'f1': } 27920352
> {'f1': , 'f2': {0x7f7bce0cd6e0>} 27920352 } 27395472
>
> This is surprising since I would expect to have a single global
> dictionary, not two: how comes the registry inside the ``if __name__ ==
> '__main__'`` block is different from the one seen in the library?
>
> This is python 2.7.3 on Ubuntu.
Welcome to python -- this is a trap every newbie falls into ;)
Seriously, you shouldn't use the main script as a library; it is put into
the sys.modules cache under the "__main__" key. Subsequent imports under its
real name will not find that name in the cache and import another instance
of the module, with puzzling effects, like
$ cat x.py
import x
class A: pass
a = A()
assert isinstance(a, x.A)
$ python x.py
Traceback (most recent call last):
File "x.py", line 4, in
assert isinstance(a, x.A)
AssertionError
$
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Re: surprising behaviour of global dictionaries
On Tuesday, October 9, 2012 5:24:17 PM UTC+2, Peter Otten wrote: > Seriously, you shouldn't use the main script as a library; it is put into > > the sys.modules cache under the "__main__" key. Subsequent imports under its > > real name will not find that name in the cache and import another instance > > of the module, with puzzling effects Actually I usually never use the main script as a library, this is why I never experience this puzzling behavior before. But now it is clear, thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: surprising behaviour of global dictionaries
On 2012-10-09, Peter Otten <__pete...@web.de> wrote: > Welcome to python -- this is a trap every newbie falls into ;) > > Seriously, you shouldn't use the main script as a library; There must be something wrong with me. It never even occurred to me to try to import a file from within that same file. I don't think I've ever even heard of that before... -- Grant Edwards grant.b.edwardsYow! The Korean War must at have been fun. gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Generating C++ code
Greetings, I'm trying to generate C++ code from an XML file. I'd like to use a template engine, which imo produce something readable and maintainable. My google search about this subject has been quite unsuccessful, I've been redirected to template engine specific to html mostly. Does anybody knows a python template engine for generating C++ code ? Here's my flow: XML file -> nice python app -> C++ code >From what I know I could use Cheetah, a generic template engine. I never used >it though, I'm not sure this is what I need. I'm familiar with jinja2 but I'm not sure I could use it to generate C++ code, did anybody try ? (maybe that's a silly question) Any advice would be appreciated. JM -- http://mail.python.org/mailman/listinfo/python-list
Re: wordnet semantic similarity: how to refer to elements of a pair in a list? can we sort dictionary according to the value?
Thanks indeed for your tips. Now I understand the difference between tuples and dictionaries deeper. -- http://mail.python.org/mailman/listinfo/python-list
Re: surprising behaviour of global dictionaries
On 10/09/2012 11:36 AM, Michele Simionato wrote: > On Tuesday, October 9, 2012 5:24:17 PM UTC+2, Peter Otten wrote: >> Seriously, you shouldn't use the main script as a library; it is put into >> >> the sys.modules cache under the "__main__" key. Subsequent imports under its >> >> real name will not find that name in the cache and import another instance >> >> of the module, with puzzling effects > Actually I usually never use the main script as a library, this is why I > never experience this puzzling behavior before. But now it is clear, thanks. More generally, you should arrange your imports so that there are no cycles. If module/script "a" imports "b", directly or indirectly, "b" should not try to import "a." Move the common code to a third place, and import it from both "a" and from "b". The other symptoms you can get are more subtle than this one, but just as surprising. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
RE: RE: Unpaking Tuple
Bob Martin wrote > in 682592 20121008 232126 "Prasad, Ramit" wrote: > >Thomas Bach wrote:=0D=0A> Hi there,=0D=0A> =0D=0A> On Sat, Oct 06, 2012 at = > >03:08:38PM +, Steven D'Aprano wrote:=0D=0A> >=0D=0A> > my_tuple =3D my_= > >tuple[:4]=0D=0A> > a,b,c,d =3D my_tuple if len(my_tuple) =3D=3D 4 else (my_= > >tuple + (None,)*4)[:4]=0D=0A> >=0D=0A> =0D=0A> Are you sure this works as y= > >ou expect? I just stumbled over the following:=0D=0A> =0D=0A> $ python=0D= > >=0A> Python 3=2E2=2E3 (default, Jun 25 2012, 23:10:56)=0D=0A> [GCC 4=2E7=2E= > >1] on linux2=0D=0A> Type "help", "copyright", "credits" or "license" for mo= > >re information=2E=0D=0A> >>> split =3D ['foo', 'bar']=0D=0A> >>> head, tail= > >=3D split if len(split) =3D=3D 2 else split[0], None=0D=0A> >>> head=0D=0A= > >> ['foo', 'bar']=0D=0A> >>> tail=0D=0A> >>>=0D=0A> =0D=0A> I don't get it! = > >Could someone help me, please? Why is head not 'foo'=0D=0A> and tail not 'b= > >ar'?=0D=0A> =0D=0A> Regards,=0D=0A> Thomas=0D=0A> --=0D=0A=0D=0AI think yo= > >u just need to wrap the else in parenthesis so the=0D=0Aelse clause is trea= > >ted as a tuple=2E Without the parenthesis =0D=0AI believe it is grouping th= > >e code like this=2E=0D=0A=0D=0Ahead, tail =3D (split if len(split) =3D=3D 2= > >else split[0] ), None=0D=0A=0D=0AYou want:=0D=0Ahead, tail =3D split if le= > >n(split) =3D=3D 2 else (split[0], None )=0D=0A=0D=0A=0D=0ARamit=0D=0AThis e= > >mail is confidential and subject to important disclaimers and=0D=0Aconditio= > >ns including on offers for the purchase or sale of=0D=0Asecurities, accurac= > >y and completeness of information, viruses,=0D=0Aconfidentiality, legal pri= > >vilege, and legal entity disclaimers,=0D=0Aavailable at http://www=2Ejpmorg= > >an=2Ecom/pages/disclosures/email=2E > > How does one unpack this post? ;-) > -- Hmm, I am not sure why that happened. For reference: http://mail.python.org/pipermail/python-list/2012-October/632603.html This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- http://mail.python.org/mailman/listinfo/python-list
Re: FW: question Python custome events
On Tue, Oct 9, 2012 at 2:35 AM, Hussain, Mushabbar wrote: > > > Hi, > > Is it possible to define an Event which should fire when a value of a > variable changes? Something like below > > > > self.Bind(wx.EVT_ON_VAL_CHANGE, variable_to_watch, self.Callback) > > > > I need a Text ctrl UI which continuously changes values based on external > data changes. Unfortunately I could not find events in Python which can be > triggered when a variable value changes? Please let me know how this can be > achieved? Yes, you would need to: 1) encapsulate the variable; 2) define a custom event; 3) set up a wx.EvtHandler for the variable, since it's not itself associated with a window; 4) bind your callback to the event handler; 5) have the variable setter fire the custom event. That said, an event is likely not going to be the best way to do this. You should instead use the wx.lib.pubsub module, which implements the observer pattern for you. This will be cleaner and easier, as you only need to: 1) encapsulate the variable; 2) subscribe your callback to the update message; 3) have the variable setter publish the update message. Observers are also conceptually simpler than events. You can find information about pubsub at: http://wiki.wxpython.org/WxLibPubSub Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
Re: surprising behaviour of global dictionaries
Grant Edwards wrote: > On 2012-10-09, Peter Otten <__pete...@web.de> wrote: > >> Welcome to python -- this is a trap every newbie falls into ;) >> >> Seriously, you shouldn't use the main script as a library; > > There must be something wrong with me. It never even occurred to me > to try to import a file from within that same file. It is typically done in two steps: (1) Write module x, use it in module y. (2) For convenience add "if __name__ == '__main__'" and import module y. Hilarity ensues. > I don't think I've ever even heard of that before... As I was poking fun at Michele who really is an expert and likely knows more about Python than I do I may have exaggerated a bit ;) But it does come up, see "Singleton implementation problems" http://mail.python.org/pipermail/python-list/2008-July/470770.html "Dynamically declared shared constant/variable imported twice problem" http://mail.python.org/pipermail/python-list/2009-May/535619.html There are more, but I don't know a convenient way to find the posts. Related problems with reload() or paths into a package occur even more frequently. -- http://mail.python.org/mailman/listinfo/python-list
Getting ipython notebook to plot inline
I've just managed to install ipython and get it to run by typing ipython notebook --pylab=inline Now I'm getting the following error when I try to plot something in ipython notebook: AttributeError: 'module' object has no attribute 'FigureCanvas' I've tried using imports to make this work: import matplotlib.pyplot as plt import numpy as np x = np.arange(0, 5, 0.1); y = np.sin(x) plt.plot(x, y) But for some reason I still get this error. Anybody else know what's going on here? All of the print statements I've done before have worked, and I actually got my plots to work when I didn't set --pylab=inline, though they came up in a separate window and I want them to stay in the ipython notebook. -- http://mail.python.org/mailman/listinfo/python-list
Re: Generating C++ code
On 10/09/2012 05:00 PM, Jean-Michel Pichavant wrote: Greetings, I'm trying to generate C++ code from an XML file. I'd like to use a template engine, which imo produce something readable and maintainable. My google search about this subject has been quite unsuccessful, I've been redirected to template engine specific to html mostly. Does anybody knows a python template engine for generating C++ code ? Here's my flow: XML file -> nice python app -> C++ code From what I know I could use Cheetah, a generic template engine. I never used it though, I'm not sure this is what I need. I'm familiar with jinja2 but I'm not sure I could use it to generate C++ code, did anybody try ? (maybe that's a silly question) Any advice would be appreciated. JM I think you can use anything to generate C++ code, but is it a good idea? Are you going to produce this code only one time and then maintain it manually? And are you sure that the design that you would get from the XML file actually makes sense when translated in C++? -- http://mail.python.org/mailman/listinfo/python-list
Re: Generating C++ code
On Tue, 09 Oct 2012 20:55:48 +0100 Andrea Crotti wrote: > On 10/09/2012 05:00 PM, Jean-Michel Pichavant wrote: > > Greetings, > > > > I'm trying to generate C++ code from an XML file. I'd like to use a > > template engine, which imo produce something readable and maintainable. > > My google search about this subject has been quite unsuccessful, I've been > > redirected to template engine specific to html mostly. > > > > Does anybody knows a python template engine for generating C++ code ? > > > > Here's my flow: > > > > XML file -> nice python app -> C++ code > > > > From what I know I could use Cheetah, a generic template engine. I never > > used it though, I'm not sure this is what I need. > > I'm familiar with jinja2 but I'm not sure I could use it to generate C++ > > code, did anybody try ? (maybe that's a silly question) > > > > Any advice would be appreciated. > > > > JM > > I think you can use anything to generate C++ code, but is it a good idea? > Are you going to produce this code only one time and then maintain it > manually? > > And are you sure that the design that you would get from the XML file > actually makes sense when > translated in C++? > -- > http://mail.python.org/mailman/listinfo/python-list You can build nice python app with Cython/Pyrex too if you got sufficient knowledge in C/C++ programming to extend the app in C. :-) Otherwise that seem like a little counter-productive to produce a python template only for generating C stubs when python is good for many things without requiring advanced C++ skills like memory management, etc. HTH, E -- Etienne Robillard Green Tea Hackers Club Fine Software Carpentry For The Rest Of Us! http://gthc.org/ e...@gthcfoundation.org -- http://mail.python.org/mailman/listinfo/python-list
share with friends
HotNet1 hi, join small social bookmarking and share best links with pepole. Please share your friends.We are waiting for you. thank you HotNet1 team http://www.hotnet1.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Private methods
On Tue, 09 Oct 2012 11:08:13 -0600, Ian Kelly wrote: > On Tue, Oct 9, 2012 at 8:08 AM, Demian Brecht > wrote: >> A single underscore semantically means private. A double underscore >> will name mangle the function such that it's only accessible strictly >> by name through the class that it's define in. Note that you *can* >> still access it if you understand how name mangling works. Nothing in >> Python is truly private. > > I tend to view name mangling as being more for avoiding internal > attribute collisions in complex inheritance structures than for > designating names as private. Really? I tend to view name mangling as a waste of time, and complex inheritance structures as something to avoid. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Private methods
On 12-10-09 04:51 PM, Steven D'Aprano wrote: Really? I tend to view name mangling as a waste of time, and complex inheritance structures as something to avoid. Yep, I've been coming around to this as of late. -- Demian Brecht @demianbrecht http://demianbrecht.github.com -- http://mail.python.org/mailman/listinfo/python-list
an error in python lib?
Hi list, I just noticed that in /usr/lib/python2.7/threading.py class _Condition(_Verbose): ... def _is_owned(self): # Return True if lock is owned by current_thread. # This method is called only if __lock doesn't have _is_owned(). if self.__lock.acquire(0): self.__lock.release() return False else: return True The return values seem to be wrong. They should be swapped: def _is_owned(self): if self.__lock.acquire(0): self.__lock.release() return True else: return False Or I understood it wrong here? Thanks, Wenhua -- http://mail.python.org/mailman/listinfo/python-list
Re: IDLE Crashing in Mac OS 10.8.2 with 2.7.3
On 10/9/12 11:27 AM, bkee...@gmail.com wrote: I've tried all the usual suspect of uninstalling and reinstalling IDLE and Python 2.7.3, but my IDLE environment always crashes unexpectedly on Mac OS X 10.8. Where did you get Python? What version of Tcl/Tk do you have installed? Is it the one from ActiveState or the one bundled with OS X? -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Porting notmm to pep 3333 and mod_wsgi
Hi, Has PEP- introduced backward incompatibilities or changes in unicode encoding and decoding or should this updated pep require python 3 to make mod_wsgi working with wsgi 1.0 (pep-333) scripts ? Moreover is it possible to use python 2.7 with mod_wsgi at all without the utf-8 encoding errors? Besides theses minor Unicode encoding problems I'm glad to announce experimental mod_wsgi support for notmm on python 2.7.3. I will also include a sample app into the next notmm release as a proof-of-concept for Django-based projects but so far I haven't found more serious problems following the standard documentation in mod_wsgi 3.4... Furthermore this newer support for mod_wsgi should allow experimented Django developers to use mod_wsgi and Apache as an alternative to FastCGI (and nginx) for serving high-performance Django apps compiled into optimized C bindings using Cython and notmm! :-) Cheers, Etienne -- Etienne Robillard Green Tea Hackers Club Fine Software Carpentry For The Rest Of Us! http://gthc.org/ e...@gthcfoundation.org Donations for the notmm project are accepted through Pledgie.com. For more info please visit: http://pledgie.com/campaigns/16268 -- http://mail.python.org/mailman/listinfo/python-list
Re: an error in python lib?
On 2012-10-10 01:32, Wenhua Zhao wrote: Hi list, I just noticed that in /usr/lib/python2.7/threading.py class _Condition(_Verbose): ... def _is_owned(self): # Return True if lock is owned by current_thread. # This method is called only if __lock doesn't have _is_owned(). if self.__lock.acquire(0): self.__lock.release() return False else: return True The return values seem to be wrong. They should be swapped: def _is_owned(self): if self.__lock.acquire(0): self.__lock.release() return True else: return False Or I understood it wrong here? The .acquire method will return True if the attempt to acquire has been successful. This can occur only if it is not currently owned. In pseudocode: if the attempt to acquire it succeeds: no-one owed it before, but now I own it release it now no-one owns it return False else: someone already owns it return True -- http://mail.python.org/mailman/listinfo/python-list
communicate with external process via pty
I have an external process, 'tralics' that emits mathml when you feed it
latex equations. I want to get that mathml into a string.
The problem for me is that tralics wants to talk to a tty and I've never
done that before; it basically starts its own subshell.
I have the following code which works for simple things. I'm not sure
this is the best way though: basically I got this from google...
import os,sys
import subprocess
import shlex
import pty
cmd = 'tralics --interactivemath'
(master, slave) = pty.openpty()
p = subprocess.Popen(shlex.split(cmd),close_fds=True,
stdin=slave,stdout=slave,stderr=slave)
os.read(master,1024)# start the process
os.write(master,'$\sqrt{x}$\n') # feed it an equation
mathml.append(os.read(master,1024)) # get the mathml in a string
os.write(master,'$\sqrt{x}$\n') # feed more equations
mathml.append(os.read(master,1024)) # get the next string
Any suggestions for improvement?
thanks,
--Tim
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lxml 3.0 final released - efficient XML and HTML processing with Python
Hi everyone, it's been a while since the last stable release series appeared, so I'm proud to announce the final release of lxml 3.0. http://lxml.de/ http://pypi.python.org/pypi/lxml/3.0 Changelog: http://lxml.de/changes-3.0.html In short, lxml is the most feature-rich and easy-to-use library for processing XML and HTML in the Python language. It's also very fast, in case you're interested in that. It runs on Python 2.4 - 3.3. The 3.0 release features initial support for PyPy and a new tree API for DTDs (by Walter Dörwald), as well as some major cleanups in the code base. The lxml.cssselect package was moved into a separate PyPI project nicely extended and maintained by Simon Sapin. If you are interested in commercial support or customisations for the lxml package, please contact me directly. Have fun, Stefan -- http://mail.python.org/mailman/listinfo/python-list
