date:20120924

Re: Fastest web framework

2012-09-24 Thread Alec Taylor

Can you throw in web2py?

Thanks

On Sun, Sep 23, 2012 at 7:19 PM, Andriy Kornatskyy <
andriy.kornats...@live.com> wrote:

>
> 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
>
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> http://mail.python.org/mailman/listinfo/python-list
>
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RE: Fastest web framework

2012-09-24 Thread Andriy Kornatskyy


Accepted.


> Date: Mon, 24 Sep 2012 17:36:25 +1000 
> Subject: Re: Fastest web framework 
> From: alec.tayl...@gmail.com 
> To: andriy.kornats...@live.com 
> CC: python-list@python.org 
> 
> Can you throw in web2py? 
> 
> Thanks 
> 
> On Sun, Sep 23, 2012 at 7:19 PM, Andriy Kornatskyy 
> mailto:andriy.kornats...@live.com>> wrote: 
> 
> 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 
> 
  
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Re: Invalid identifier claimed to be valid by docs (methinks)

2012-09-24 Thread Joshua Landau

On 24 September 2012 03:42, Terry Reedy  wrote:

> On 9/23/2012 6:57 PM, Ian Kelly wrote:
>
>> On Sun, Sep 23, 2012 at 4:24 PM, Joshua Landau
>>  wrote:
>>
>>> The docs describe identifiers to have this grammar:
>>>
>>> identifier   ::=  xid_start xid_continue*
>>> id_start ::=  >> Lo,
>>> Nl, the underscore, and characters with the Other_ID_Start property>
>>> id_continue  ::=  >> categories Mn, Mc, Nd, Pc and others with the Other_ID_Continue property>
>>> xid_start::=  >> is in
>>> "id_start xid_continue*">
>>>
>>
> xid_start is a subset of id_start
>
>
>  xid_continue ::=  >> normalization is
>>> in "id_continue*">
>>>
>>
> xid_continue is a subset of id_continue.
>
>
>  So I would assume that
>>>  exec("a{} = None".format(char))
>>> would be valid if
>>> unicodedata.normalize("NFKC", char)  == "1"
>>>
>>
> Read more carefully the definition of xid_continue. The un-normalized
> character must also be in id_continue.
>
Correct. Thank you for your time.


>  as
>>> exec("a1 = None")
>>> is valid.
>>>
>>> BUT "a¹ = None" is not valid*.
>>>
>>
> >>> ud.category("\u00b9")
> 'No'
>
> Category No is *not* in id_continue, and therefore not in xid_continue.
>
>
> exec("x\u00b9 = None")  # U+00B9 is superscript 1
>>
>> On the other hand, this does work:
>>
>> exec("x\u2071 = None")  # U+2071 is superscript i
>>
>> So it seems to be only an issue with superscript and subscript digits.
>>   Looks like a compiler bug to me.
>>
>
> The problem, if there were one, would be in the tokenizer that finds
> identifiers. However,
>
>
> >>> exec("x\u00b9 = None")
> ...
> x¹ = None
>   ^
> SyntaxError: invalid character in identifier
>
> this is correct.


Thank you both for helping. The bug is officially closed.
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Re: Fastest web framework

2012-09-24 Thread Tarek Ziadé


On 9/23/12 11:19 AM, Andriy Kornatskyy wrote:

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


I would try this with a web app that does more than 'Hello World'

You may argue that you're just trying the server stack, but that's not 
realistic because you don't really measure how the server behaves with a 
real app.


Have a look at 
https://github.com/mozilla-services/chaussette/blob/master/chaussette/util.py#L188


(setup_bench and teardow_bench have to be run on startup and tear down 
of the server)


I would be curious to see how things goes then

Cheers
Tarek
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style-url support for simplekml

2012-09-24 Thread lodeameije

Hi!
I love the simplekml package. 
I have a lot of files and always use an external file for styles.
For the moment, I could not find how to implement a style-url without running 
over the kml file after generating and changing 'manually'(well, it "is" 
automated) all styles:

i.e.: 
..\..\Cada_Styles.kml#B_CaPa
instead of 
#stylesel_459 (when a style was defined...)

An idea for the next version or am I looking over something?

Kind regards,
Lode
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Re: [Python-Dev] [RELEASED] Python 3.3.0 release candidate 3

2012-09-24 Thread Ethan Furman


Mark Lawrence wrote:

On 24/09/2012 07:18, Georg Brandl wrote:


[snip impressive list of improvements]

Yes, but apart from all that, what have the python devs ever done for 
us?  Nothing :)


I'll take that kind of nothing any day of the week!  ;)

~Ethan~

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Re: Pass numeric arrays from C extensions to Python

2012-09-24 Thread Grant Edwards

On 2012-09-24, JBT  wrote:

> I am looking for a way to pass numeric arrays, such as *float a[100];
> double b[200];*, from C extension codes to python. The use case of
> this problem is that you have data stored in a particular format,
> NASA common data format (CDF) in my case, and there exists an
> official C library to read/create/edit such data, and you want to do
> data analysis in python. The problem comes down to how to feed the
> data into python.

In a addition to scipy and scientific python (two different projects),
you should probably take a look at the struct module and the ctypes
module.

-- 
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  at   CONTEST!  I'm REFRESHINGLY
  gmail.comCANDID!!
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Re: keeping information about players around

2012-09-24 Thread Jean-Michel Pichavant

- Original Message -
> ytHello all:
> I've asked for a couple code reviews lately on a mud I've been
> working
> on, to kind of help me with ideas and a better design.
> 
> I have yet another design question.
> In my mud, zones are basically objects that manage a collection of
> rooms; For example, a town would be it's own zone.
> It holds information like maxRooms, the list of rooms as well as some
> other data like player owners and access flags.
> The access flags basically is a list holding the uid of a player, as
> well as a bitarray of permissions on that zone. For example, a player
> might have the ability to edit a zone, but not create rooms.
> So I have a couple of questions based on this:
> First, how viable would it be to keep a sort of player database
> around
> with stats and that?
> It could contain the player's level, as well as other information
> like
> their access (player, admin, builder etc), and then when someone does
> a
> whois on the player I don't have to load that player up just to get
> data
> about them. How would I keep the information updated? When I delete a
> player, I could just delete the entry from the database by uid.
> Second, would it be viable to have both the name and the uid stored
> in
> the dictionary? Then I could look up by either of those?
> 
> Also, I have a couple more general-purpose questions relating to the
> mud.
> When I load a zone, a list of rooms get stored on the zone, as well
> as
> world. I thought it might make sense to store references to objects
> located somewhere else but also on the world in WeakValueDictionaries
> to
> save memory. It prevents them from being kept around (and thus having
> to
> be deleted from the world when they lose their life), but also (I
> hope)
> will save memory. Is a weakref going to be less expensive than a full
> reference?
> Second, I want to set up scripting so that you can script events for
> rooms and npcs. For example, I plan to make some type of event
> system,
> so that each type of object gets their own events. For example, when
> a
> player walks into a room, they could trigger some sort of trap that
> would poison them. This leads to a question though: I can store
> scripting on objects or in separate files, but how is that generally
> associated and executed?
> Finally, I just want to make sure I'm doing things right. When I
> store
> data, I just pickle it all, then load it back up again. My world
> object
> has an attribute defined on it called picklevars, which is basically
> a
> list of variables to pickle, and my __getstate__ just returns a
> dictionary of those. All other objects are left "as-is" for now.
> Zones,
> (the entire zone and all it's rooms) get pickled, as well as players
> and
> then the world object for persistence. Is this the suggested way of
> doing things? I'll also pickle the HelpManager object, which will
> basically contain a list of helpfiles that can be accessed, along
> with
> their contents.
> Thanks, and appologies for all the questions.
> 
> --
> Take care,
> Ty
> http://tds-solutions.net
> The aspen project: a barebones light-weight mud engine:
> http://code.google.com/p/aspenmud
> He that will not reason is a bigot; he that cannot reason is a fool;
> he that dares not reason is a slave.
> 
> --
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> 

That's a lot of questions, few specific to python.
I have one advice:

Don't think too much about performances. Focus on keeping things simple, work 
on your design and forget about implementation.
Pickle everything, use sqllite for your database. When you get things working, 
then you can start measuring your performances and think about clever 
implementation to speed up things **if needed** (<- key notion). 


JM

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Re: Python presentations

2012-09-24 Thread andrea crotti

For anyone interested, I already moved the slides on github
(https://github.com/AndreaCrotti/pyconuk2012_slides)
and for example the decorator slides will be generated from this:

https://raw.github.com/AndreaCrotti/pyconuk2012_slides/master/deco_context/deco.rst

Notice the literalinclude with :pyobject: which allows to include any
function or class automatically very nicely from external files ;)
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Re: keeping information about players around

2012-09-24 Thread Jean-Michel Pichavant

- Original Message -
> >Pickle everything, use sqllite for your database. When you get
> >things
> working, then you can start measuring your performances and think
> >about
> clever implementation
> That was a bunch of information; sorry about that. what do you mean
> by
> using sqlite for the database? Currently I just drop everything into
> files. Is there a better way to do that?
> Thanks for your advice.

Please keep the discussion on list.

If you have a basic knowledge of databases, sure you could use a sqlite 
database to store you persistent objects. That's pretty reasonable.
Not to mention a lot of stuff can interface with that database. If you want to 
build a web app to manage the player database, you can, most of the frameworks 
handles sqlite. Actually if you don't need a web app, a lot of sqlite admin app 
already exists.

Note that the database is suitable only for the data. For serializing a python 
object with its code, you need pickle.

JM
 
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Re: Exact integer-valued floats

2012-09-24 Thread wrw

On Sep 22, 2012, at 7:06 PM, Dave Angel  wrote:

> On 09/22/2012 05:05 PM, Tim Roberts wrote:
>> Dennis Lee Bieber  wrote:
>>> On 22 Sep 2012 01:36:59 GMT, Steven D'Aprano wrote:
 For non IEEE 754 floating point systems, there is no telling how bad the 
 implementation could be :(
>>> Let's see what can be found...
>>> 
>>> IBM 360: Same as Sigma-6 (no surprise; hearsay is the Sigma was
>>> designed by renegade IBM folk; even down to using EBCDIC internally --
>>> but with a much different interrupt system [224 individual interrupt
>>> vectors as I recall, vs the IBM's 7 vectors and polling to find what
>>> device]).
>> The Control Data 6000/Cyber series had sign bit and 11-bit exponent, with
>> either a 48-bit mantissa or a 96-bit mantissa, packed into one or two
>> 60-bit words.  Values were not automatically normalized, so there was no
>> assumed 1 bit, as in IEEE-754.
> 
> And it's been a long time (about 39 years), but as I recall the CDC 6400
> (at least) had no integer multiply or divide.  You had to convert to
> float first.  The other oddity about the CDC series is it's the last
> machine I've encountered that used ones-complement for ints, with two
> values for zero.
> 
> 

Well, for what it is worth… the DEC Laboratory INstrument Computer (LINC-8, 
sort of a forced acronym because I believe they were built to specs issued by 
Lincoln Labs.) and the later DEC PDP-12 (which incorporated the LINC-8 
instruction set, along with the PDP-8 basic set) also did ones-complement 
integer arithmetic.  I never used a LINC-8, but I worked for several years 
around PDP-12s.  (They also had a build-in CRT and a MUX'd analog-to-digital 
converter with CPU instructions for driving both directly.)  As I remember, 
they maxed out at 32k (12-bit) words of RAM.  I don't know when they were 
discontinued, but there were still some PDP-12s in use as late as 1988 when I 
lost track. 

-Bil

> -- 
> 
> DaveA
> 
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Re: Java singletonMap in Python

2012-09-24 Thread Duncan Booth

Steven D'Aprano  wrote:

> On Mon, 24 Sep 2012 00:14:23 +0100, Mark Lawrence wrote:
> 
>> Purely for fun I've been porting some code to Python and came across
>> the singletonMap[1].  I'm aware that there are loads of recipes on
>> the web for both singletons e.g.[2] and immutable dictionaries
>> e.g.[3].  I was wondering how to combine any of the recipes to
>> produce the best implementation, where to me best means cleanest and
>> hence most maintainable.  I then managed to muddy the waters for
>> myself by recalling the Alex Martelli Borg pattern[4].  Possibly or
>> even probably the latter is irrelevant, but I'm still curious to know
>> how you'd code this beast.
>> 
>> First prize for the best solution is a night out with me, no guesses
>> what the second prize is :)
>> 
>> [1]http://docs.oracle.com/javase/1.4.2/docs/api/java/util/
> Collections.html
> 
> Copied from that page:
> 
> "static Map singletonMap(Object key, Object value) 
> Returns an immutable map, mapping only the specified key to the
> specified value."
> 
> I don't see the point of this. It takes a single key, with a single 
> value, and is immutable so you can't change it or add new keys. What's
> the point? Why bother storing the key:value pair in a data structure, 
> then look up the same data structure to get the same value every time?
> 
> # Pseudo-code
> d = singletonMap(key, calculate(key))
> # later:
> value = d[key]  # there's only one key this could be
> process(value)
> 
> 
> Why not just store the value, instead of key, value and mapping?
> 
> value = calculate(key)
> # later
> process(value)
> 
> 
> 
Google is your friend. Searching for "java singletonMap" gives this as
the second hit:

http://stackoverflow.com/questions/7125536/when-would-i-use-java-collections-singletonmap-method

The answers seem to be that it's for all those cases in Java where you have a 
method that takes a map as an argument and you want to pass in a map with a 
single
kep/value pair. In that case it lets you replace 3 lines of Java with 1.

e.g. from the comments:
"If you have a simple select statement like "select foo from bar where id = 
:barId" 
then you would need a parameter map with a single key-value pair, barId=123. 
That's a great place to use singletonMap()"

Of course in Python you just use a dict literal in that case so it's pointless.

-- 
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Re: write to a file two dict()

2012-09-24 Thread inq1ltd

On Sunday, September 23, 2012 10:44:30 AM giuseppe.amatu...@gmail.com wrote:
> Hi
> Have two dict() of the same length and i want print them to a common file.
> 
> 
> a={1: 1, 2: 2, 3: 3}
> b={1: 11, 2: 22, 3: 33}
> 
> in order to obtain
> 
> 1 1 1 11
> 2 2 2 22
> 3 3 3 33
> 
> I tried
> 
> output = open(dst_file, "w")
> for (a), b , (c) , d in a.items() , b.items() :
> output.write("%i %i %i %i\n" % (a,b,c,d))
> output.close()

Try this, not exactly what you want, but close.

Refine it to get what you want.

dictC = {}

a={1: 1, 2: 2, 3: 3}
b={1: 11, 2: 22, 3: 33}

for bkey in b.keys():

newlist = []
x = str(b.get(bkey, ''))
x = str(bkey)+x
newlist.append(x)

y = str(a.get(bkey, ''))
y = str(bkey)+y
newlist.append(y)

dictC[bkey] = newlist

print dictC, 


jimonlinux,
inqvista.com


> 
> but i get the error ValueError: need more than 3 values to unpack.
> 
> do you have some suggestions?.
> Thanks
> Giuseppe-- 
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Re: Does python have built command for package skeleton creation?

2012-09-24 Thread 88888 Dihedral

xliiv於 2012年9月21日星期五UTC+8下午9時13分38秒寫道：
> On Friday, September 21, 2012 3:04:02 PM UTC+2, Tarek Ziadé wrote:
> 
> > On 9/21/12 2:14 PM, xliiv wrote:
> 
> > 
> 
> > >
> 
> > 
> 
> > > Python Paste is probably what you are looking for - see
> 
> > 
> 
> > >
> 
> > 
> 
> > > http://lucasmanual.com/mywiki/PythonPaste for example
> 
> > 
> 
> > > It's a nice beast but:
> 
> > 
> 
> > > - it's not built in. Should it be? I think it should.
> 
> > 
> 
> > You can suggest this to python-ideas but I really doubt you will get any 
> 
> > 
> 
> > traction. The sdtlib don't get new features these days because it's a burden
> 
> > 
> 
> > to maintain high level tool on a 2 years release cycle
> 
> 
> 
> Why is this '2 years release cycle'?

This is good in python to focus on comming HW patforms with 
varied parameters as the industry is advacing toward  all way 
to avoid a heavy landing of the IT and electronics industry.
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Re: Java singletonMap in Python

2012-09-24 Thread 88888 Dihedral

Duncan Booth於 2012年9月25日星期二UTC+8上午1時33分31秒寫道：
> Steven D'Aprano  wrote:
> 
> 
> 
> > On Mon, 24 Sep 2012 00:14:23 +0100, Mark Lawrence wrote:
> 
> > 
> 
> >> Purely for fun I've been porting some code to Python and came across
> 
> >> the singletonMap[1].  I'm aware that there are loads of recipes on
> 
> >> the web for both singletons e.g.[2] and immutable dictionaries
> 
> >> e.g.[3].  I was wondering how to combine any of the recipes to
> 
> >> produce the best implementation, where to me best means cleanest and
> 
> >> hence most maintainable.  I then managed to muddy the waters for
> 
> >> myself by recalling the Alex Martelli Borg pattern[4].  Possibly or
> 
> >> even probably the latter is irrelevant, but I'm still curious to know
> 
> >> how you'd code this beast.
> 
> >> 
> 
> >> First prize for the best solution is a night out with me, no guesses
> 
> >> what the second prize is :)
> 
> >> 
> 
> >> [1]http://docs.oracle.com/javase/1.4.2/docs/api/java/util/
> 
> > Collections.html
> 
> > 
> 
> > Copied from that page:
> 
> > 
> 
> > "static Map singletonMap(Object key, Object value) 
> 
> > Returns an immutable map, mapping only the specified key to the
> 
> > specified value."
> 
> > 
> 
> > I don't see the point of this. It takes a single key, with a single 
> 
> > value, and is immutable so you can't change it or add new keys. What's
> 
> > the point? Why bother storing the key:value pair in a data structure, 
> 
> > then look up the same data structure to get the same value every time?
> 
> > 
> 
> > # Pseudo-code
> 
> > d = singletonMap(key, calculate(key))
> 
> > # later:
> 
> > value = d[key]  # there's only one key this could be
> 
> > process(value)
> 
> > 
> 
> > 
> 
> > Why not just store the value, instead of key, value and mapping?
> 
> > 
> 
> > value = calculate(key)
> 
> > # later
> 
> > process(value)
> 
> > 
> 
> > 
> 
> > 
> 
> Google is your friend. Searching for "java singletonMap" gives this as
> 
> the second hit:
> 
> 
> 
> http://stackoverflow.com/questions/7125536/when-would-i-use-java-collections-singletonmap-method
> 
> 
> 
> The answers seem to be that it's for all those cases in Java where you have a 
> 
> method that takes a map as an argument and you want to pass in a map with a 
> single
> 
> kep/value pair. In that case it lets you replace 3 lines of Java with 1.
> 
> 
> 
> e.g. from the comments:
> 
> "If you have a simple select statement like "select foo from bar where id = 
> :barId" 
> 
> then you would need a parameter map with a single key-value pair, barId=123. 
> 
> That's a great place to use singletonMap()"
> 
> 
> 
> Of course in Python you just use a dict literal in that case so it's 
> pointless.
> 
> 
> 
> -- 
> 
> Duncan Booth http://kupuguy.blogspot.com

Cheers to those who are programmers that really love  authoring in the high 
level one with tools to translate into other computer languages,
and also collecting  the upgrade fees from clients.


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Re: Java singletonMap in Python

2012-09-24 Thread Devin Jeanpierre

On Sun, Sep 23, 2012 at 7:14 PM, Mark Lawrence  wrote:
> Purely for fun I've been porting some code to Python and came across the
> singletonMap[1].  I'm aware that there are loads of recipes on the web for
> both singletons e.g.[2] and immutable dictionaries e.g.[3].  I was wondering
> how to combine any of the recipes to produce the best implementation

The word "singleton" usually means "thing with only one item". For
example, {a} is a singleton set containing only a, and with matrices,
any dimension of size one is called a singleton dimension, and so on.
In this case, a singleton map is a map with only one key-value pair,
such as {a:b}.

The singleton design antipattern is not relevant here.

-- Devin
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Re: Java singletonMap in Python

2012-09-24 Thread Mark Lawrence

On 24/09/2012 18:33, Duncan Booth wrote:

Steven D'Aprano wrote:

On Mon, 24 Sep 2012 00:14:23 +0100, Mark Lawrence wrote:

Purely for fun I've been porting some code to Python and came across
the singletonMap[1]. I'm aware that there are loads of recipes on
the web for both singletons e.g.[2] and immutable dictionaries
e.g.[3]. I was wondering how to combine any of the recipes to
produce the best implementation, where to me best means cleanest and
hence most maintainable. I then managed to muddy the waters for
myself by recalling the Alex Martelli Borg pattern[4]. Possibly or
even probably the latter is irrelevant, but I'm still curious to know
how you'd code this beast.

First prize for the best solution is a night out with me, no guesses
what the second prize is :)

[1]http://docs.oracle.com/javase/1.4.2/docs/api/java/util/

Collections.html

Copied from that page:

"static Map singletonMap(Object key, Object value)
Returns an immutable map, mapping only the specified key to the
specified value."

I don't see the point of this. It takes a single key, with a single
value, and is immutable so you can't change it or add new keys. What's
the point? Why bother storing the key:value pair in a data structure,
then look up the same data structure to get the same value every time?

# Pseudo-code
d = singletonMap(key, calculate(key))
# later:
value = d[key] # there's only one key this could be
process(value)

Why not just store the value, instead of key, value and mapping?

value = calculate(key)
# later
process(value)

Google is your friend. Searching for "java singletonMap" gives this as
the second hit:

http://stackoverflow.com/questions/7125536/when-would-i-use-java-collections-singletonmap-method

The answers seem to be that it's for all those cases in Java where you have a
method that takes a map as an argument and you want to pass in a map with a
single
kep/value pair. In that case it lets you replace 3 lines of Java with 1.

e.g. from the comments:
"If you have a simple select statement like "select foo from bar where id =
:barId"
then you would need a parameter map with a single key-value pair, barId=123.
That's a great place to use singletonMap()"

Of course in Python you just use a dict literal in that case so it's pointless.

Thank goodness for that, I'd assumed that I'd missed something blatantly
obvious. There are two chances of something like this getting into the
standard library, zero or none. I think in a way that's a great pity as
I'm sure that the Python devs would enjoy supporting the little feller
with code such as this http://tinyurl.com/9v7d7ld :)

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Cheers.

Mark Lawrence.

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Re: Fastest web framework

2012-09-24 Thread Albert Hopkins

On Sun, 2012-09-23 at 12:19 +0300, Andriy Kornatskyy wrote:
> 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.
> 

The thing I don't like about these benchmarks is.. they tell you which
framework is best for writing a trivial 'hello world' application.  But
no one writes trivial 'hello world' applications.  A
framework/programming language/software package/what-have-you.  Can be
really fast for trivial stuff, but perform much less favorably when
performing "real-world" tasks.  It's kind of the same argument that's
used when people say X computer boots faster than Y computer.  That's
nice and all, but I spend much more of my time *using* my computer than
*booting* it, so it doesn't give me a good picture of how the computers
perform.  This is why most "good" benchmarks run a series various tests
based on real-world use cases.

-a

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Re: Java singletonMap in Python

2012-09-24 Thread Mark Lawrence


On 24/09/2012 20:22, Devin Jeanpierre wrote:

On Sun, Sep 23, 2012 at 7:14 PM, Mark Lawrence  wrote:

Purely for fun I've been porting some code to Python and came across the
singletonMap[1].  I'm aware that there are loads of recipes on the web for
both singletons e.g.[2] and immutable dictionaries e.g.[3].  I was wondering
how to combine any of the recipes to produce the best implementation


The word "singleton" usually means "thing with only one item". For
example, {a} is a singleton set containing only a, and with matrices,
any dimension of size one is called a singleton dimension, and so on.
In this case, a singleton map is a map with only one key-value pair,
such as {a:b}.

The singleton design antipattern is not relevant here.

-- Devin



Java thinks so otherwise there wouldn't also be the singleton which is 
the spelling for singletonSet (don't ask me!!!) and a singletonList. 
From the Python viewpoint I think YAGNI is perfect.  I now understand 
why the BDFL and others fight so hard to keep bloatware out of the 
standard library.


--
Cheers.

Mark Lawrence.

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Re: Does python have built command for package skeleton creation?

2012-09-24 Thread Daniel Nogues


alternatively you can use virtualenv to create virtual environments

http://www.virtualenv.org/en/latest/index.html

however, if what you want is automated generation of some of the code,  
you can adopt an IDE or create some macros in your text editor of  
choice.



From: alex23 
Date: 24 September 2012 06:00:01 IST
To: python-list@python.org
Subject: Re: Does python have built command for package skeleton  
creation?



On Sep 24, 2:29 pm, Terry Reedy  wrote:
Batteries are batteries, not flashlights, phone, radios, toys,  
clickers,

etc.


I decided not to mention "venv" as it undermines my rant a little :)



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PIL questions: still supported? Problems on 2.7 for win? alternatives?

2012-09-24 Thread Gelonida N


Hi,

I'm trying to migrate a project with legacy code from 2.6 (with PIL 
1.1.6) to 2.7 with (PIL 1.1.7)

The SW should run on Windows.


PIL fails with an error concering '_imagingft'
This seems to be a known issue.

http://code.google.com/p/pythonxy/issues/detail?id=300
and the bug was never closed.

One suggestion is to download an alternative build from a non official site.

Looking at the activity of PIL ( 
http://www.pythonware.com/products/pil/index.htm ) it seems, that 
development stopped,
The latest build (with known bugs and missing functionality for python 
2.7.) seems to be from November 15, 2009.
In the net I read, that there's so little activity on PIL, because it's 
stable, which doesn't seem to be the case for the 2.7 binary package.


This all does not sound very comforting. Why is there no fix on the 
official site?


I wondered whether some of you have a little more insight into what's 
going on with PIL.


Short term: get PIL working on 2.7 windows?

My shortterm problem is migrating existing code to 2.7 and keeping the 
code, that uses PIL.
So I'll probably try to install the custom binary, but would like to 
know whether anybody has experience with this build.

http://www.lfd.uci.edu/~gohlke/pythonlibs/#pil

Alternatively how tricky is PIL to be compiled with mingw?



Mid term: What to use to manipulate images?


My midterm problem is to stay with Python 2.7 and to write occasinally 
new code, that does some basic image manipulations.


Can I still count on PIL? The fact, that the official devs don't even 
bother to fix some basic functionality of their binary release tells me 
that either very few people use PIL (or at least the broken 
functionality somehow related to the font libraries) on 2.7


What alternatives do exist for PIL?
We just need some lines drawn, some text drown, some scaling, 
transparency merging, . . . and PIL seend decent enough.


There seems to be freeimagepy, but the bindings seem to be 'only' ctypes 
bindings http://freeimagepy.sourceforge.net/

Any experience with this libraries?

Any other suggestions?



Longterm Will PIL officially exist for Python 3?
-

When really all libraries that the project  needs are supported
I''ll probably migrate to Python 3.

For Python 3 there is not even a broken official release, but only forks.

Why isn't any of these forks becoming 'official'?

If a package is not supported for Windows via official binary releases / 
easy_install, then I'm a little more afraid, that the package 
(maintainers included) will disappear in the near future.


Thanks a lot in advance for opinions / recommendations / clarifications









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RE: Fastest web framework

2012-09-24 Thread Andriy Kornatskyy


Try to see 'Hello World' benchmark as an answer to the question how effective 
is the framework inside...

If computer X boots faster than Y, it means it is more effective in this 
particular area.

If a sportsman runs a distance 1 second faster than other, he got a medal (it 
is not quite adequate to say if I load sportsman with 50 kilo bag he will not 
run that fast... just try split the concerns).

Thanks.

Andriy



> Subject: Re: Fastest web framework
> From: mar...@letterboxes.org
> To: python-list@python.org
> Date: Mon, 24 Sep 2012 15:42:00 -0400
>
> On Sun, 2012-09-23 at 12:19 +0300, Andriy Kornatskyy wrote:
> > 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.
> >
>
> The thing I don't like about these benchmarks is.. they tell you which
> framework is best for writing a trivial 'hello world' application. But
> no one writes trivial 'hello world' applications. A
> framework/programming language/software package/what-have-you. Can be
> really fast for trivial stuff, but perform much less favorably when
> performing "real-world" tasks. It's kind of the same argument that's
> used when people say X computer boots faster than Y computer. That's
> nice and all, but I spend much more of my time *using* my computer than
> *booting* it, so it doesn't give me a good picture of how the computers
> perform. This is why most "good" benchmarks run a series various tests
> based on real-world use cases.
>
> -a
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
  
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Re: Anyone able to help on installing packages?

2012-09-24 Thread John Mordecai Dildy

Anyone have Ideas on nose and distribute?
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metaclass question

2012-09-24 Thread Chris Withers


Hi All,

Is there a metaclass-y way I could cause the following:

class TheParser(Parser):
def handle_ARecord(self):
pass
def handle_ARecord(self):
pass

...to raise an exception as a result of the 'handle_ARecord' name being 
reused?


cheers,

Chris

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- http://www.simplistix.co.uk
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Re: metaclass question

2012-09-24 Thread Ian Kelly

On Mon, Sep 24, 2012 at 11:43 AM, Chris Withers  wrote:
> Hi All,
>
> Is there a metaclass-y way I could cause the following:
>
> class TheParser(Parser):
> def handle_ARecord(self):
> pass
> def handle_ARecord(self):
> pass
>
> ...to raise an exception as a result of the 'handle_ARecord' name being
> reused?

In Python 2.x, no.

In Python 3.x, the __prepare__ method of the metaclass allows you to
specify a custom namespace object for the class definition.  The most
commonly cited use case is to use an OrderedDict to remember the order
in which the attributes are defined, but you could also use a dict
subclass that raises an exception if an attribute is redefined.  See
the docs at:

http://docs.python.org/dev/reference/datamodel.html#preparing-the-class-namespace
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Re: request for another code review

2012-09-24 Thread Littlefield, Tyler


On 9/23/2012 9:48 PM, alex23 wrote:

On Sep 23, 6:14 am, "Littlefield, Tyler"  wrote:

I've gotten a bit farther into my python mud, and wanted to request
another code review for style and the like.

Are you familiar with codereview.stackexchange.com ?



I actually wasn't, thanks!



(This isn't to dissuade you from posting such requests here, just to
help increase the chance of eyeballs on your code.)



--
Take care,
Ty
http://tds-solutions.net
The aspen project: a barebones light-weight mud engine:
http://code.google.com/p/aspenmud
He that will not reason is a bigot; he that cannot reason is a fool; he that 
dares not reason is a slave.

--
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Re: request for another code review

2012-09-24 Thread Littlefield, Tyler


On 9/23/2012 9:48 PM, alex23 wrote:

On Sep 23, 6:14 am, "Littlefield, Tyler"  wrote:

I've gotten a bit farther into my python mud, and wanted to request
another code review for style and the like.

Are you familiar with codereview.stackexchange.com ?



I actually wasn't, thanks!



(This isn't to dissuade you from posting such requests here, just to
help increase the chance of eyeballs on your code.)



--
Take care,
Ty
http://tds-solutions.net
The aspen project: a barebones light-weight mud engine:
http://code.google.com/p/aspenmud
He that will not reason is a bigot; he that cannot reason is a fool; he that 
dares not reason is a slave.

--
http://mail.python.org/mailman/listinfo/python-list

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