Re: Optimization: Picking random keys from a dictionary and mutating values

[Carl Banks]

On May 28, 7:41 pm, blaine <[EMAIL PROTECTED]> wrote:
> Hey everyone,
>   Just a friendly question about an efficient way to do this.

Friendly advance reminder: in many optimization problems, the
objective function is far more expensive to calculate than the
optimizing procedure.  Your time is usually better spent optimizing
the objective function, or tuning the optimizer.

But what they hey.

> I have
> a graph with nodes and edges (networkx is am amazing library, check it
> out!).  I also have a lookup table with weights of each edge.  So:
>
> weights[(edge1, edge2)] = .12
> weights[(edge2, edge5)] = .53
> weights[(edge5, edge1)] = 1.23
> weights[(edge3, edge2)] = -2.34
> etc.
>
> I would like to take this weight table and subject it to evolutionary
> mutations.  So given a probability p (mutation rate), mutate edge
> weights by some random value.   So in effect, if p is .25, choose 25%
> random edges, and mutate them some amount.  So:
> 1.  Whats a good way to get the keys? I'm using a loop with
> random.choice() at the moment.

That's probably the best way.

You might be able to squeeze a little more speed out of it by using a
partial random shuffle as opposed to removing the item from the list.
This will minimize the amount of copying.  Here's an example (without
error checking):

def partial_random_shuffle(lst,nshuffled):
for i in xrange(nshuffled):
j = random.randrange(i,len(lst))
t = lst[i]
lst[i] = lst[j]
lst[j] = t

The first nshuffled items of lst upon return will be the selected
items.  Note: This might also be slower than removing items.  It
should scale better, though.


> 2.  Any comments on how to get a 'fair' mutation on an existing edge
> value?

random.normalvariate is usually a good choice for selecting random
real-valued increments.

val = random.normalvariate(val,sigma)

where sigma, the standard deviation, is the amount


> I currently am doing something like this, which seems like it leaves
> something to be desired.
>
> import random
> weights = generateweights() # generates table like the one above
> p = 0.25
> v = random.betavariate(2, 10)
> num = int(v*len(weights)) # How many weights should we mutate?
> keys = w.keys()
> for i in xrange(num):
>   val = random.choice(keys) # Choose a single random key
>   w[val] = w[val]*(random.random()*5-1) # Is this a 'good' way to
> 'mutate' the value?

If you don't remove keys[val], there's a chance you'll mutate the same
key twice, which I doubt is what you want.


> This is an evolutionary search, so mutate in this sense relates to a
> genetic algorithm, perhaps a gradient decent?

A gradient descent method is not an evolutionary search and involves
no randomness (unless noise is added to the objective, which is a
possible way to attack a function with unimportant small scale
features, and in that case normalvariate would be the thing used).



Carl Banks
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Anyone using TestNG

[kanarya]

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Re: How to get all the variables in a python shell

[A.T.Hofkamp]

On 2008-05-29, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hi!
>
> I'm currently working on a scientific computation software built in
> python.
> What I want to implement is a Matlab style command window <->
> workspace interaction.

ok, although I personally favor the style of writing and running a
script/program, since it scales much better (you can easier automate steps),
and it is much easier reproducible (something you probably want in scientific
software) and storable (in a VCS).

> For example, you type 'a=1' in the command window, and you see a list
> item named 'a' in the workspace.
> You double click the icon of the item, and you see its value. You can
> modify the value of the list item,
> 1 -> 100 etc,  after which if you go back to the command window and
> type 'a'  and press enter, you see that
> varable a's value has been changed to 100.

I do hope you have made a fair estimate of the amount of work that it costs to
change the value of a variable in this way.

I would propose to simply use the interactive Python prompt. It doesn't give
you popup icons for clicking, but you do get the entire Python interpreter, and
all its libraries for free.

The Python library has a frame work for customizing the interpreter. Have a
look at 'cmd' module.

> So my question is : if you have two DOS command windows running under
> WINDOWS OS, how can you make them share the same internal variable
> buffer? Or is there any easier way to implement such kind of
> interaction?

Now you have lost me. One window is not enough for interaction?

Obviously, you'll need to have a common interpreter/storage backend. One
solution may be to have a common execution back-end, and for each window a
'frontend' which passes commands entered to the back-end, and echoes results
from the back-end to the terminal.

> Maybe I could just build a small database to store all the values and
> access them from both programs, but chances are sometimes I have to
> deal with big arrays, and they will eat extra memory if I keep them in

They eat memory when you keep them in a data base? It seems, you are making
assumptions about implementations here without telling them.
(ie pick a data base that uses a disk, and your problem is solved. Why is that
not an option?)

Sincerely,
Albert

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How do I tell "imconplete input" from "valid input"?

[たか]

Hi everyone,

 I am developing the console which has the embedded Python interactive
interpreter. So, I want to judge whether current command is complete
or not. Below is good example to solve this problem.

//
// http://effbot.org/pyfaq/how-do-i-tell-incomplete-input-from-invalid-input.htm
//
int testcomplete(char *code)
  /* code should end in \n */
  /* return -1 for error, 0 for incomplete, 1 for complete */
{
  node *n;
  perrdetail e;

  n = PyParser_ParseString(code, &_PyParser_Grammar,
   Py_file_input, &e);
  if (n == NULL) {
if (e.error == E_EOF)
  return 0;
return -1;
  }

  PyNode_Free(n);
  return 1;
}

 But, I think this code has a problem. For example, when argument
'code' has below python command,

if x % 2:
   print "odd"

at the current situation, this function returns COMPLETE!
But, I think that sometimes users want to type "else" statement. So, I
expected to get INCOMPLETE from this function, but I didn't.

How should I do it?


Thanks,
urai
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Re: Struct usages in Python

[Alex Gusarov]

>
> Yes. That is the somewhat unfortunate difference between new-style and
> old-style classes. Use new-style if you can, and that means that "object"
> must be part of the inheritance graph.
>
...

> You are wrong for Python 2.X, but right for Python 3 where old-style
> classes are gone for good.
>

Thanks, I don't knew it before and it's a sensitive information for me.

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Re: Python and Flaming Thunder

[Duncan Booth]

Dave Parker <[EMAIL PROTECTED]> wrote:

> Catch doesn't return just error types or numbers, it can return any
> object returned by the statements that are being caught; catch doesn't
> care what type they are.  For example:
> 
>   Writeline catch(set x to "hello world".).
> 
> will write "hello world".

I really don't get this. Surely the point about an error being thrown to a 
catch statement is that the error path is separate from the normal 
execution path? What you are doing here is ensuring that unexpected errors 
have no chance at all of propagating up to the top level: they are 
invariably going to get caught by some other handler that was installed 
just because someone was too lazy to write a set statement followed by a 
writeline.

-- 
Duncan Booth http://kupuguy.blogspot.com
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Re: Struct usages in Python

[Alex Gusarov]

>
> Yes. That is the somewhat unfortunate difference between new-style and
> old-style classes. Use new-style if you can, and that means that "object"
> must be part of the inheritance graph.
>
...

> You are wrong for Python 2.X, but right for Python 3 where old-style
> classes are gone for good.
>

Thanks, I don't knew it before and it's a sensitive information for me.

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Re: Struct usages in Python

[Alex Gusarov]

> Yes. That is the somewhat unfortunate difference between new-style and 
> old-style classes.
> Use new-style if you can, and that means that "object" must be part of the 
> inheritance graph.

...

>You are wrong for Python 2.X, but right for Python 3 where old-style
>
>classes are gone for good.

Thanks, I don't knew it before and it's a sensitive information for me.

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Re: pydb remote debugging/cmd.Cmd over socket?

[Diez B. Roggisch]

As part of the 2006 Google Summer of Code project Matt Flemming
started working on remote debugging in pydb. Alas it wasn't completed
and I let the code fall through the cracks. 


Matt claimed it worked to some degree but I could never get it to work
for me. Most definitely the code has atrophied.

The user interface was loosely based or reminiscent of gdb. So
you'd run pydbserver either as a command inside the debugger or as an
option to pydb or call inside Python pdbserver after importing. 


There is a connection class (file pydb/connection.rb) which was to
allow different kinds of protocols, like a socket connection or 
a serial line connection, or maybe even two FIFO's so that you could

connect to a different process on the same computer.

And there were some commands on the user-interaction side
to attach or detach the Python program you want to debug.

If you look in pydb.py.in and gdb.py.in you'll see some code commented
out with double hashes which is part of this effort.

I invite you or others to try to resurrect this effort. However as I
look at the code now, it doesn't make much sense other than the broad
outline given above.


Hm. Ok, I'll look into that. It's just that I don't get cmd.Cmd to work 
against two streams. Maybe I need to dive into unix-coding a bit deeper 
again.



Another approach and possibly a much simpler one if you are looking
for a Python debugger which supports remote debugging is Winpdb
http://winpdb.org/ by Nir Aides.



I've found that - and while it's nice, it has one problem: I can only 
start it with winpdb governing the process already, preventing python 
from starting.


In contrast, the possibility to use a sginal to start the debugger of 
pydb is great, so that's the reason I want to stick with it.


Diez
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code of a function

[Dark Wind]

Hi,

Is there any command in Python which gives the code for a function like just
typing the name of a function (say svd) in R returns its code.

Thank you
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Re: How to get all the variables in a python shell

[Tim Golden]

[EMAIL PROTECTED] wrote:

I'm currently working on a scientific computation software built in
python.
What I want to implement is a Matlab style command window <->
workspace interaction.

For example, you type 'a=1' in the command window, and you see a list
item named 'a' in the workspace.
You double click the icon of the item, and you see its value. You can
modify the value of the list item,
1 -> 100 etc,  after which if you go back to the command window and
type 'a'  and press enter, you see that
varable a's value has been changed to 100.

So my question is : if you have two DOS command windows running under
WINDOWS OS, how can you make them share the same internal variable
buffer? Or is there any easier way to implement such kind of
interaction?


I stronly suggest you look at IPython [1]. To do what I think
you're describing, you'd need to hack or reimplement the interpreter.
And that's what they've done. ISTR that they even have a branch
which is dealing with parallel instances.

TJG

[1] http://ipython.scipy.org/moin/
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Re: unittest: Calling tests in liner number order

[Antoon Pardon]

On 2008-05-24, Fuzzyman <[EMAIL PROTECTED]> wrote:
>
> A worthwhile question for the OP - your patch seems fairly simple. Is
> it easy for you to extend unittest for your own testing needs by
> subclassing?

I've been ill the last days, but I will look into this possibility.

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run a script in vista

[Graham Feeley]

Hi, I have a script which runs in xp, however now I have upgraded to vista 
this script now does'nt work

Can someone help with this problem please ?
this is the start of the script

import cPAMIE
import cModalPopUp
import winGuiAuto as wga
import time, datetime
import os, sys, re
import mx.ODBC.Windows as odbc

appreciate any help  here
Regards
Graham

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Finding file details...

[Kalibr]

I've been trying to figure out how to find the details of files
(specifically music for now) for a little sorting script I'm making,
My aim is to get details on the artist, album, and genre for mp3 and
wma files (possibly more in the future). My closest match was when I
stumbled accross PyMedia, but it only supports up to 2.4 (I have 2.5).
Now I see a bit mentioned on GetFileVersionInfo, but that doesn't seem
to help (and most of it went over my head). Is there any module I can
use to find this sort of data? I'm trying to not make it specialised
in music, because I may want to extend this to picture, movie, text
etc. files in the future. Any ideas how I could go about this?
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Re: run a script in vista

[Tim Golden]

Graham Feeley wrote:
Hi, I have a script which runs in xp, however now I have upgraded to 
vista this script now does'nt work

Can someone help with this problem please ?
this is the start of the script

import cPAMIE
import cModalPopUp
import winGuiAuto as wga
import time, datetime
import os, sys, re
import mx.ODBC.Windows as odbc


You're not helping very much here: what does "now doesn't work" mean?
It doesn't even start? It runs but gives an error? If so, what's the traceback?
etc. etc.

TJG
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Re: code of a function

[Gary Herron]

Dark Wind wrote:

Hi,

Is there any command in Python which gives the code for a function 
like just typing the name of a function (say svd) in R returns its code.


Thank you


Nope.




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Compare 2 files and discard common lines

[loial]

I have a requirement to compare 2 text files and write to a 3rd file
only those lines that appear in the 2nd file but not in the 1st file.

Rather than re-invent the wheel I am wondering if anyone has written
anything already?

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Re: How do I tell "imconplete input" from "valid input"?

[Inyeol . Lee]

On May 29, 9:26 am, たか <[EMAIL PROTECTED]> wrote:
> Hi everyone,
>
>  I am developing the console which has the embedded Python interactive
> interpreter. So, I want to judge whether current command is complete
> or not. Below is good example to solve this problem.
> //
> //http://effbot.org/pyfaq/how-do-i-tell-incomplete-input-from-invalid-i...
> //
> int testcomplete(char *code)
>   /* code should end in \n */
>   /* return -1 for error, 0 for incomplete, 1 for complete */
> {
>   node *n;
>   perrdetail e;
>
>   n = PyParser_ParseString(code, &_PyParser_Grammar,
>Py_file_input, &e);
>   if (n == NULL) {
> if (e.error == E_EOF)
>   return 0;
> return -1;
>   }
>
>   PyNode_Free(n);
>   return 1;
>
> }
>
>  But, I think this code has a problem. For example, when argument
> 'code' has below python command,
>
> if x % 2:
>print "odd"
>
> at the current situation, this function returns COMPLETE!
> But, I think that sometimes users want to type "else" statement. So, I
> expected to get INCOMPLETE from this function, but I didn't.
>
> How should I do it?
>
> Thanks,
> urai

I guess you should use "Py_single_input" instead of "Py_file_input" in
your code, which requires extra NEWLINE to end complex statement.
Plz check details in Grammar/Grammar from python source distribution

--Inyeol
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Re: code of a function

[Anand Patil]

On Thu, May 29, 2008 at 9:10 AM, Dark Wind <[EMAIL PROTECTED]> wrote:

> Hi,
>
> Is there any command in Python which gives the code for a function like
> just typing the name of a function (say svd) in R returns its code.
>
> Thank you
>

If you're using IPython, you can type svd?? .
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Re: Compare 2 files and discard common lines

[Chris]

On May 29, 10:36 am, loial <[EMAIL PROTECTED]> wrote:
> I have a requirement to compare 2 text files and write to a 3rd file
> only those lines that appear in the 2nd file but not in the 1st file.
>
> Rather than re-invent the wheel I am wondering if anyone has written
> anything already?

How large are the files ? You could load up the smallest file into
memory then while iterating over the other one just do 'if line in
other_files_lines:' and do your processing from there.  By your
description it doesn't sound like you want to iterate over both files
simultaneously and do a line for line comparison because that would
mean if someone plonks an extra newline somewhere it wouldn't gel.
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Re: Compare 2 files and discard common lines

[Stefan Behnel]

loial wrote:
> I have a requirement to compare 2 text files and write to a 3rd file
> only those lines that appear in the 2nd file but not in the 1st file.

   lines_in_file2 = set(open("file2").readlines())
   for line in open("file1"):
   if line not in lines_in_file2:
   print line

Stefan
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Re: Compare 2 files and discard common lines

[Stefan Behnel]

Kalibr wrote:
> On May 29, 6:36 pm, loial <[EMAIL PROTECTED]> wrote:
>> I have a requirement to compare 2 text files and write to a 3rd file
>> only those lines that appear in the 2nd file but not in the 1st file.
>>
>> Rather than re-invent the wheel I am wondering if anyone has written
>> anything already?
> 
> You can use the cmp(x, y) function to tell if a string is similar to
> another.

Or "==".

Stefan
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Re: Compare 2 files and discard common lines

[Kalibr]

On May 29, 6:36 pm, loial <[EMAIL PROTECTED]> wrote:
> I have a requirement to compare 2 text files and write to a 3rd file
> only those lines that appear in the 2nd file but not in the 1st file.
>
> Rather than re-invent the wheel I am wondering if anyone has written
> anything already?

You can use the cmp(x, y) function to tell if a string is similar to
another.

going cmp('spam', 'eggs') will return 1 (spam is greater than eggs)
(have no idea why)
swapping the two give -1
and having 'eggs' and 'eggs' gives 0.

is that what you were looking for?
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请教,关于Python对多处理器的支持，Pyth on在AIX下但CPU的效率比多CPU的效率高?

[Cyril.Liu]

最近在公司在优化平台（C +
Python实现的一个业务处理框架：C实现的一个网络服务接受来自外界的请求，收到请求后创建一个进程调用Python解释器执行Python脚本进行业务逻辑处理）发现Python脚本在
AIX下多处理器环境下运行的效率还不如在单处理器环境下的运行效率。我觉得这个跟GIL有关系，但我们的Python脚本里用的基本上都是Python自带的lib做一些简单的业务逻辑处理和数据库操作（DB2,
数据库操作模块是我们用C实现的一套DB API）
且没有用多线程。这似乎不应该出现处理器增多而性能下降的抖动现象啊。请问大家是否有着方面的经验，分享一下。谢谢！
另外问一下，Python在多处理器下的运行效率，难道只能通过C扩展的方式来提高吗？！把多线程换成多进程是否能起到一定的效果？!

Python版本： 2.4
系统: AIX 5.3
DB: DB2 8.2
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---
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Re: Finding file details...

[Tim Golden]

Kalibr wrote:

I've been trying to figure out how to find the details of files
(specifically music for now) for a little sorting script I'm making,
My aim is to get details on the artist, album, and genre for mp3 and
wma files (possibly more in the future). My closest match was when I
stumbled accross PyMedia, but it only supports up to 2.4 (I have 2.5).
Now I see a bit mentioned on GetFileVersionInfo, but that doesn't seem
to help (and most of it went over my head). Is there any module I can
use to find this sort of data? I'm trying to not make it specialised
in music, because I may want to extend this to picture, movie, text
etc. files in the future. Any ideas how I could go about this?


You don't say, but I assume you're on Windows since you mention
GetFileVersionInfo (which doesn't have anything to do with media
files, by the way) and WMA. There may be packages out there
to do all this already but if not you'll need to pull in a few disparate
modules and mix'n'match.

While ID3 readers (which determine the metadata for MP3) are reasonably
common few of them come ready-compiled for Windows. I've used Ned
Batchelder's id3reader [1] successfully for simple tasks so you might try
that. On the WMA side, you can automate Windows Media Player to get
metadata. (And it might work for .mp3; I've not tried).


import win32com.client

player = win32com.client.gencache.EnsureDispatch ("WMPlayer.OCX")
wmedia = player.mediaCollection.add (r"c:\temp\bells.mp3")
try:
 artist = wmedia.getItemInfo ("Artist")
finally:
 player.mediaCollection.remove (wmedia, False)

print "bells.mp3 has artist", artist



You're going to have to dig around for docs on this one. And it's not
pretty. Try starting from: 


http://msdn.microsoft.com/en-us/library/bb249009(VS.85).aspx

TJG

[1] http://nedbatchelder.com/code/modules/id3reader.html
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Re: code of a function

[Christian Heimes]

Dark Wind schrieb:
> Hi,
> 
> Is there any command in Python which gives the code for a function like just
> typing the name of a function (say svd) in R returns its code.

Yes, it's posible to retrieve the source code IFF the function is
implemented in Python and the .py file is available, too.

>>> print inspect.getsource(inspect.getsource)
def getsource(object):
"""Return the text of the source code for an object.

The argument may be a module, class, method, function, traceback, frame,
or code object.  The source code is returned as a single string.  An
IOError is raised if the source code cannot be retrieved."""
lines, lnum = getsourcelines(object)
return string.join(lines, '')

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cmd.Cmd bug or at least docu-bug

[Diez B. Roggisch]

Hi,

I'm fiddling around with module cmd. I tried to pass my own streams as
replacements for stdin and stdout. However, stdin wasn't working. After a
look into the sourcecode I discovered that there is an class-variable
called 

use_rawinput

that prevents using the passed stdin. I then read the docs again - and found
it described. However, I think it should be mentioned on the first page
where the constructor is described that without setting use_rawinput to
False, stdin will be ignored.

Or even better either make use_rawinput set to false in case stdin is passed
anything but None or at least make it a keyword argument.

Any thoughts about this?

Diez
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Easy install / setuptools

[Dominique.Holzwarth]

Hi everyone

I'm trying to figure out the "best" way to distribute my own python packages. 
Basicly, what I want is to have something like an "installer.exe" (on windows) 
which puts my package under Python/Lib/site-packages (so that it can be found 
via the PYTHONPATH).

I've played around a bit with "easy install" and "setuptools" and the .egg 
format. I've already managed to create a "myPackage.egg" file with setup tools 
and "install" (it's just a copying) it ito the site-packages directory using 
"easy install".

What I was wondering now is if there's a way to actually EXTRACT the egg file 
and put the extracted file (i.e. the .py file) under site-packages. And not the 
.egg?

The problem with egg files is that you can't use 
"open(os.path.join(os.path.dirname(__file__),'myFile')" and I'd need to rewrite 
such code which I'd like to avoid if possible. Also, I don't know whether 
leaving the python scripts packed inside the egg file is slower for execution 
or not...

Would be cool if someone could give me some inputs on how to distribute python 
packages in an easy and effective way :-)

Thx in advance
Dominique


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You should ensure that you have adequate virus protection as the De La Rue
Group of companies do not accept liability for any viruses.

De La Rue plc Registered No.3834125, De La Rue Holdings plc Registered
No 58025 and De La Rue International Limited Registered No 720284 are all
registered in England with their registered office at:
De La Rue House, Jays Close, Viables, Hampshire RG22 4BS
*
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Re: Custom log handler and logging.config.fileConfig()

[Vinay Sajip]

On May 28, 9:53 pm, "Lowell Alleman" <[EMAIL PROTECTED]>
wrote:
> Here is the situation:  I wrote my own log handler class (derived 
> fromlogging.Handler) and I want to be able to use it from aloggingconfig
> file, that is, a config file loaded with thelogging.config.fileConfig() 
> function.
>
> Let say myloggingclass is called "MyLogHandler" and it's in a module
> called "mylogmodule", I want to be able to make an entry something
> like this in myloggingconfig file:
>
>[handler_hand02]
>class=mylogmodule.MyLogHandler
>level=DEBUG
>formatter=form02
>args=('python.log', 10, True)
>
> I did some digging in the code and documentation, and it doesn't
> appear that this question of writing and accessing your own log
> handlers is addressed.  As per thelogging/config.py code, it looks
> like the actual file handler classes are being grabbed using an "eval"
> from the "logging" module's namespace, like so:
>klass = eval(klass, vars(logging))
>
> So this basically means that I have to mess with the "logging"
> module's namespace if I want this to work, right?  So I've come up
> with a couple of options, but I'm trying to figure out what approach
> is best:
>
> Option 1:  Require the client (the user of myloggingmodule), first
> import my module and then copy it into theloggingmodule's namespace,
> before calling  fileConfig().  Something like this:
>
> import mylogmodule
> importlogging
>logging.mylogmodule = mylogmodule
>
> Option 2:  Have my module make a copy MyLogHandler class into 
> thelogging(orlogging.handlers) module, and then let the client use it
> from their directly.  They client would still have to load mylogging
> class first (which isn't any different they what they would have to do
> if they wanted to use the extended log handlers form thelogging.handlers 
> module)
>
> My module would include:
> importlogging
> class MyLogHandler(logging.Handler):
> ...
>logging.MyLogHandler = MyLogHandler
>
> The config file would simply have:
> class=MyLogHandler
>
> Option 3:   Is there an easy (and non-evil) way for me to make my
> module available as "logging.mylogmodule" directly?  I am using
> setuptools, and it seems like what I've read about "namespaces", they
> do something close to what I'm looking for, but I think that requires
> that all of the "__init__.py"s involved be empty (or have some special
> namespace declaration code).  The __init__.py for theloggingmodule
> is not at all empty, so I suppose that rules out this option?  Anyone
> have some insights on this?
>
> Thanks in advance,
>
> - Lowell Alleman

Hi Lowell,

I think it's OK to use the logging.handlers namespace to add your
custom handlers - after all, the handlers namespace is for holding
handlers other than the basic ones included in "logging". So...

# -- myhandler.py ---
import logging.handlers

class MySpecialHandler(logging.handlers.RotatingFileHandler):
def __init__(self, fn):
logging.handlers.RotatingFileHandler.__init__(self, fn,
maxBytes=2000, backupCount=3)


# -- logging.ini ---
[loggers]
keys=root

[handlers]
keys=hand01

[formatters]
keys=form01

[logger_root]
level=NOTSET
handlers=hand01

[handler_hand01]
class=handlers.MySpecialHandler
level=NOTSET
formatter=form01
args=("rotating.log",)

[formatter_form01]
format=%(asctime)s %(levelname)s %(message)s
datefmt=
class=Formatter

# -- app.py ---
import logging.handlers, logging.config
from myhandler import MySpecialHandler

logging.handlers.MySpecialHandler = MySpecialHandler

logging.config.fileConfig("logging.ini")

logger = logging.getLogger("test")

for i in xrange(100):
logger.debug("Message no. %d", i)


should produce the expected results.
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Re: php vs python

[Diez B. Roggisch]

> A good OO programmer could easily write good functional code.

You are aware that functional programming is *not* procedural or imperative
programming? 

http://en.wikipedia.org/wiki/Functional_programming

OO is *heavily* depending on state and state modification. I've seen OO
programmers weep over functional programming assignments. Which is not to
say that FP is in any sense bad - au contraire, knowing it is important
because it is a different school of thought that's very valuable to know
of. And Python allows for many of the FP concepts to be used. See map,
filter and other HOFs.

Diez
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Re: How do I tell "imconplete input" from "valid input"?

[たか]

thanks for your reply.

I tried below python codes with "Py_single_input" instead of
"Py_file_input".

sample 1 : result is INCOMPLETE
for i in range(3):\n

sample 2 : result is COMPLETE(I want to get INCOMPLETE or something)
for i in range(3):\n\tprint i
   or
for i in range(3):\n\tprint i\n

"Py_single_input" and "Py_file_input" seem the same. How come?

> Plz check details in Grammar/Grammar from python source distribution

thanks. I challenge it.

--urai
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Re: Finding file details...

[Kalibr]

On May 29, 7:55 pm, Tim Golden <[EMAIL PROTECTED]> wrote:
>
> You don't say, but I assume you're on Windows since you mention
> GetFileVersionInfo (which doesn't have anything to do with media
> files, by the way) and WMA. There may be packages out there
> to do all this already but if not you'll need to pull in a few disparate
> modules and mix'n'match.
>
> While ID3 readers (which determine the metadata for MP3) are reasonably
> common few of them come ready-compiled for Windows. I've used Ned
> Batchelder's id3reader [1] successfully for simple tasks so you might try
> that. On the WMA side, you can automate Windows Media Player to get
> metadata. (And it might work for .mp3; I've not tried).
>
> 
> import win32com.client
>
> player = win32com.client.gencache.EnsureDispatch ("WMPlayer.OCX")
> wmedia = player.mediaCollection.add (r"c:\temp\bells.mp3")
> try:
>   artist = wmedia.getItemInfo ("Artist")
> finally:
>   player.mediaCollection.remove (wmedia, False)
>
> print "bells.mp3 has artist", artist
>
> 
>
> You're going to have to dig around for docs on this one. And it's not
> pretty. Try starting from:
>
> http://msdn.microsoft.com/en-us/library/bb249009(VS.85).aspx
>
> TJG
>
> [1]http://nedbatchelder.com/code/modules/id3reader.html

Hmm, thanks for the info. Yes, I am using Winders (Vista to be exact)
and I just assumed that there must be a way to programmatically get
the stuff you get from choosing properties in the right click menu.
But I guess there isn't (hard to believe, because I can't see MS hard-
coding each and every file format's metadata into it's OS). I might
have to learn more about the command prompt ( I hear there is a module
for fiddling with it) and work from there.

Cheers for the links though, I will be checking them out :)
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Error: Cannot convert Decimal("0.0000") to Decimal

[Vitaliy]

Hi

I got this wired exception periodically (Python 2.5, Django based
application)
what does it mean ?
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Re: How to get all the variables in a python shell

[Tim Golden]

[EMAIL PROTECTED] wrote:

I'm currently working on a scientific computation software built in
python.
What I want to implement is a Matlab style command window <->
workspace interaction.

For example, you type 'a=1' in the command window, and you see a list
item named 'a' in the workspace.
You double click the icon of the item, and you see its value. You can
modify the value of the list item,
1 -> 100 etc,  after which if you go back to the command window and
type 'a'  and press enter, you see that
varable a's value has been changed to 100.

So my question is : if you have two DOS command windows running under
WINDOWS OS, how can you make them share the same internal variable
buffer? Or is there any easier way to implement such kind of
interaction?


I stronly suggest you look at IPython [1]. To do what I think
you're describing, you'd need to hack or reimplement the interpreter.
And that's what they've done. ISTR that they even have a branch
which is dealing with parallel instances.

TJG

[1] http://ipython.scipy.org/moin/
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Re: Any way to loop through object variables?

[Dave Challis]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Ah thanks, vars(...) was exactly what I was after.  I'd come across
dir() before, but this returns more than I need.

Thanks again,
Dave

Saju Pillai wrote:
> 
> On 28-May-08, at 9:49 PM, Gary Herron wrote:
> 
>> Dave Challis wrote:
>>> Hi,
>>> Just wondering if there's a way to iterate through all variables which
>>> an object has set?
>>>
>>> Specifically, I'm using the OptionParser module, which returns an
>>> options object, containing all command line options as object variables.
>>> I'd like to iterate over these rather than getting at them by name.
>>>
>>> Cheers,
>>> Dave
>>
>> For this object (and many others), you can get at the attributes with
>> the vars(...) builtin.
>> It returns a dictionary of attribute names and values.
> 
> 
> Also dir(object) will get you the list of attributes of that object.
> 
> -srp
> 
>>
>>
>> Gary Herron
>>
>>
>> -- 
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>>
>>
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
> 
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- --
~o
.
<><   (
 )Dave Challis ><>   ))
_([EMAIL PROTECTED]((___
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFIPowrv26GZvAVVFERApQfAJ96bFa1wl1sbnDCNmbtf5/tpNqTaQCdHKwf
k8+Uv8yXn2Bh5ri6sf5qMmA=
=cnfO
-END PGP SIGNATURE-
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Re: Error: Cannot convert Decimal("0.0000") to Decimal

[Peter Otten]

Vitaliy wrote:

> I got this wired exception periodically (Python 2.5, Django based
> application)
> what does it mean ?

A reload() maybe?

>>> import decimal
>>> d = decimal.Decimal()
>>> reload(decimal)

>>> decimal.Decimal(d)
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.5/decimal.py", line 617, in __new__
raise TypeError("Cannot convert %r to Decimal" % value)
TypeError: Cannot convert Decimal("0") to Decimal

Peter
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RE: [python-win32] How to get all the variables in a python shell

[Dahlstrom, Roger]

-Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Golden
> Sent: Thursday, May 29, 2008 4:11 AM
> To: Python-Win32 List; python-list@python.org
> Cc: Python-Win32 List
> Subject: Re: [python-win32] How to get all the variables in a python shell
> 
> [EMAIL PROTECTED] wrote:
> > I'm currently working on a scientific computation software built in
> > python.
> > What I want to implement is a Matlab style command window <->
> > workspace interaction.
> > 
> > For example, you type 'a=1' in the command window, and you see a list
> > item named 'a' in the workspace.
> > You double click the icon of the item, and you see its value. You can
> > modify the value of the list item,
> > 1 -> 100 etc,  after which if you go back to the command window and
> > type 'a'  and press enter, you see that
> > varable a's value has been changed to 100.
> > 
> > So my question is : if you have two DOS command windows running under
> > WINDOWS OS, how can you make them share the same internal variable
> > buffer? Or is there any easier way to implement such kind of
> > interaction?
> 
> I stronly suggest you look at IPython [1]. To do what I think
> you're describing, you'd need to hack or reimplement the interpreter.
> And that's what they've done. ISTR that they even have a branch
> which is dealing with parallel instances.
> 
> TJG
> 
> [1] http://ipython.scipy.org/moin/
> ___
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> [EMAIL PROTECTED]
> http://mail.python.org/mailman/listinfo/python-win32


I'd try looking at memcached (http://www.danga.com/memcached/apis.html).  No 
hacking or reimplementation of the interpreter would be necessary, and there's a
Python api available.  I haven't used it for anything production related, but I 
have played with it a bit, and it's fast and stable.



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Re: cmd.Cmd bug or at least docu-bug

[Michele Simionato]

On May 29, 11:26 am, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I'm fiddling around with module cmd. I tried to pass my own streams as
> replacements for stdin and stdout. However, stdin wasn't working. After a
> look into the sourcecode I discovered that there is an class-variable
> called
>
> use_rawinput
>
> that prevents using the passed stdin. I then read the docs again - and found
> it described. However, I think it should be mentioned on the first page
> where the constructor is described that without setting use_rawinput to
> False, stdin will be ignored.
>
> Or even better either make use_rawinput set to false in case stdin is passed
> anything but None or at least make it a keyword argument.
>
> Any thoughts about this?
>
> Diez

I run into the same issue and I solved it by using a custom subclass
of Cmd, but I agree
that the cmd module could be improved. I even wrote a cmd2 module that
I should publish
one day or another. +1 to submit a bug report.

 Michele Simionato
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Re: [python-win32] How to get all the variables in a python shell

[Paul Moore]

On 29/05/2008, Dahlstrom, Roger <[EMAIL PROTECTED]> wrote:
> I'd try looking at memcached (http://www.danga.com/memcached/apis.html).
>  No hacking or reimplementation of the interpreter would be necessary, and
> there's a Python api available.  I haven't used it for anything production 
> related,
> but I have played with it a bit, and it's fast and stable.

Is memcached available for Windows, then? I've heard nice things about
it, but thought it was Unix-only.

Paul.
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RE: [python-win32] How to get all the variables in a python shell

[Dahlstrom, Roger]

-Original Message-
From: Paul Moore [mailto:[EMAIL PROTECTED] 
Sent: Thursday, May 29, 2008 7:23 AM
To: Dahlstrom, Roger
Cc: Python-Win32 List; python-list@python.org
Subject: Re: [python-win32] How to get all the variables in a python shell

On 29/05/2008, Dahlstrom, Roger <[EMAIL PROTECTED]> wrote:
> I'd try looking at memcached (http://www.danga.com/memcached/apis.html).
>  No hacking or reimplementation of the interpreter would be necessary, and
> there's a Python api available.  I haven't used it for anything production 
> related,
> but I have played with it a bit, and it's fast and stable.

Is memcached available for Windows, then? I've heard nice things about
it, but thought it was Unix-only.

Paul.




It is available for Windows, yes.  As a matter of fact, I've never used it on 
Unix.


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copying of this e-mail, and 
any attachments thereto, is strictly prohibited. If you have received this in 
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me and permanently delete the original and any copy of any e-mail and any 
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Re: Compare 2 files and discard common lines

[afrobeard]

Another way of doing this might be to use the module difflib to
calculate the differences. It has a sequence matcher under it which
has the function get_matching_blocks

difflib is included with python.


On May 29, 2:02 pm, Chris <[EMAIL PROTECTED]> wrote:
> On May 29, 10:36 am, loial <[EMAIL PROTECTED]> wrote:
>
> > I have a requirement to compare 2 text files and write to a 3rd file
> > only those lines that appear in the 2nd file but not in the 1st file.
>
> > Rather than re-invent the wheel I am wondering if anyone has written
> > anything already?
>
> How large are the files ? You could load up the smallest file into
> memory then while iterating over the other one just do 'if line in
> other_files_lines:' and do your processing from there.  By your
> description it doesn't sound like you want to iterate over both files
> simultaneously and do a line for line comparison because that would
> mean if someone plonks an extra newline somewhere it wouldn't gel.

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Unit tests?

[Alex Gusarov]

Hello, it seems that I have a problem - I almost finished my program
and it's necessary to test it. But I've never do it before. I even
don't know how I can do it.
Please, give me some links to testing techniques, either common or
specific to Python.
I searched in Google for information, but 'cause I don't know anything
about subject, I don't know where to start from.

Thanks
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Re: Unit tests?

[Arnaud Delobelle]

"Alex Gusarov" <[EMAIL PROTECTED]> writes:

> Hello, it seems that I have a problem - I almost finished my program
> and it's necessary to test it. But I've never do it before. I even
> don't know how I can do it.
> Please, give me some links to testing techniques, either common or
> specific to Python.
> I searched in Google for information, but 'cause I don't know anything
> about subject, I don't know where to start from.
>
> Thanks
> --
> Best regards, Alex Gusarov

Try googling "python unit test".  I did it, and amongst the first hits
were:

* docs.python.org/lib/module-unittest.html

* http://www.diveintopython.org/unit_testing/index.html

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Re: Compare 2 files and discard common lines

[alex23]

On May 29, 6:36 pm, loial <[EMAIL PROTECTED]> wrote:
> I have a requirement to compare 2 text files and write to a 3rd file
> only those lines that appear in the 2nd file but not in the 1st file.
>
> Rather than re-invent the wheel I am wondering if anyone has written
> anything already?

>>> file1 = set((x for x in open('file1')))
>>> file2 = set((x for x in open('file2')))
>>> file3 = file2.difference(file1)
>>> open('file3','w').writelines(file3)
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Re: [python-win32] How to get all the variables in a python shell

[Tim Golden]

Tim Golden wrote:

[EMAIL PROTECTED] wrote:

I'm currently working on a scientific computation software built in
python.
What I want to implement is a Matlab style command window <->
workspace interaction.

For example, you type 'a=1' in the command window, and you see a list
item named 'a' in the workspace.
You double click the icon of the item, and you see its value. You can
modify the value of the list item,
1 -> 100 etc,  after which if you go back to the command window and
type 'a'  and press enter, you see that
varable a's value has been changed to 100.

So my question is : if you have two DOS command windows running under
WINDOWS OS, how can you make them share the same internal variable
buffer? Or is there any easier way to implement such kind of
interaction?


I stronly suggest you look at IPython [1]. To do what I think
you're describing, you'd need to hack or reimplement the interpreter.
And that's what they've done. ISTR that they even have a branch
which is dealing with parallel instances.


Sorry, having seen Roger D's memcached suggestion, I realise I may
have misinterpreted your requirement. I thought that you wanted
a Python interpreter session to share its objects to another window,
hence my IPython suggestion. If you're writing your own console app
and want to share stuff, then there's any number of IPC possibilities.

Roger's already mentioned memcached which I've no more than a
passing knowledge of. But Pyro [1] is often a good bet for these
things, and the pyprocessing [2] module is gaining a fair bit of
traction at the moment. (To name just two out of many).

TJG

[1] http://pyro.sf.net
[2] http://pyprocessing.berlios.de/

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Re: Unit tests?

[Alex Gusarov]

Thx, it's quite enough for a start.
Yes, googling is almost ultimate answer for such questions, sorry for
uneasiness.

> Try googling "python unit test".  I did it, and amongst the first hits
> were:
>
>* docs.python.org/lib/module-unittest.html
>
>* http://www.diveintopython.org/unit_testing/index.html
>
> --
> Arnaud
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Tuple of coordinates

[[EMAIL PROTECTED]]

Hi,

i am using a software which uses python as its scripting language. I
want to generate a list of coordinates more or less this way:

for i in (beg, end, step):
 for j in (beg, end, step):
  for k in (beg, end, step):
.

Coords =  ((i1,j1,k1), (i2,j2,k2), ...,(in,jn.kn))


Can anyone give me some advice on how to achieve this ? I got a little
idea, but still need to keep working til i get it. Thanks in advance,


Victor
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Re: Tuple of coordinates

[cokofreedom]

a = 1, 2
b = 3, 4, 5
c = 6, 7, 8, 9
coord = list()

for i, j, k in zip(a, b, c):
coord.append((i, j, k))

print coord
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Reporting the line number of an exception

[sophie_newbie]

I'm sure this is exceedingly simple but I can't find it anywhere. When
I catch an exception I would like to report the line number of the
exception as well as the error info.

try:
someError()
except Exception, e:
"print_error_and_line_number"

How do I find the line number?

Thanks for any help!
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Re: Strange thing with types

[Diez B. Roggisch]

TYR wrote:

> I'm doing some data normalisation, which involves data from a Web site
> being extracted with BeautifulSoup, cleaned up with a regex, then
> having the current year as returned by time()'s tm_year attribute
> inserted, before the data is concatenated with string.join() and fed
> to time.strptime().
> 
> Here's some code:
> timeinput = re.split('[\s:-]', rawtime)
> print timeinput #trace statement
> print year #trace statement
> t = timeinput.insert(2, year)
> print t #trace statement
> t1 = string.join(t, '')
> timeobject = time.strptime(t1, "%d %b %Y %H %M")
> 
> year is a Unicode string; so is the data in rawtime (BeautifulSoup
> gives you Unicode, dammit). And here's the output:
> 
> [u'29', u'May', u'01', u'00'] (OK, so the regex is working)
> 2008 (OK, so the year is a year)
> None (...but what's this?)
> Traceback (most recent call last):
>   File "bothv2.py", line 71, in 
> t1 = string.join(t, '')
>   File "/usr/lib/python2.5/string.py", line 316, in join
> return sep.join(words)
> TypeError

First - don't use module string anymore. Use e.g.

''.join(t)

Second, you can only join strings. but year is an integer. So convert it to
a string first:

t = timeinput.insert(2, str(year))

Diez
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Re: Strange thing with types

[alex23]

On May 29, 11:09 pm, TYR <[EMAIL PROTECTED]> wrote:
> I'm doing some data normalisation, which involves data from a Web site
> being extracted with BeautifulSoup, cleaned up with a regex, then
> having the current year as returned by time()'s tm_year attribute
> inserted, before the data is concatenated with string.join() and fed
> to time.strptime().
>
> Here's some code:
> timeinput = re.split('[\s:-]', rawtime)
> print timeinput #trace statement
> print year #trace statement
> t = timeinput.insert(2, year)
> print t #trace statement
> t1 = string.join(t, '')
> timeobject = time.strptime(t1, "%d %b %Y %H %M")
>
> year is a Unicode string; so is the data in rawtime (BeautifulSoup
> gives you Unicode, dammit). And here's the output:
>
> [u'29', u'May', u'01', u'00'] (OK, so the regex is working)
> 2008 (OK, so the year is a year)
> None (...but what's this?)
> Traceback (most recent call last):
>   File "bothv2.py", line 71, in 
> t1 = string.join(t, '')
>   File "/usr/lib/python2.5/string.py", line 316, in join
> return sep.join(words)
> TypeError

list.insert modifies the list in-place:

>>> l = [1,2,3]
>>> l.insert(2,4)
>>> l
[1, 2, 4, 3]

It also returns None, which is what you're assigning to 't' and then
trying to join.

Replace your usage of 't' with 'timeinput' and it should work.
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seg. fault with Py_BuildValue?

[Christian Meesters]

Hi

I'm having trouble with Py_BuildValue. I was able to pinpoint the following
statement as the one causing a seg. fault with my script:

static PyObject * funcname(PyObject *self, PyObject *args) {
...
  return Py_BuildValue("(OO)", x, y);
}
where x & y are both of type PyObject.

Any suggestions here? Do I need to handle the output of Py_BuildValue
somehow before returning? How? Need to decref x & y before returning?

TIA
Christian
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Re: Tuple of coordinates

[alex23]

On May 29, 10:16 pm, "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]> wrote:
> Hi,
>
> i am using a software which uses python as its scripting language. I
> want to generate a list of coordinates more or less this way:
>
> for i in (beg, end, step):
>  for j in (beg, end, step):
>   for k in (beg, end, step):
> .
>
> Coords =  ((i1,j1,k1), (i2,j2,k2), ...,(in,jn.kn))
>
> Can anyone give me some advice on how to achieve this ? I got a little
> idea, but still need to keep working til i get it. Thanks in advance,
>
> Victor

>>> coords = [(x,y,z) for x in range(0,10) for y in range(0,10) for z in 
>>> range(0,10)]

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Re: Reporting the line number of an exception

[Peter Otten]

sophie_newbie wrote:

> I'm sure this is exceedingly simple but I can't find it anywhere. When
> I catch an exception I would like to report the line number of the
> exception as well as the error info.
> 
> try:
> someError()
> except Exception, e:
> "print_error_and_line_number"
> 
> How do I find the line number?

If you want just the line number:

tb = sys.exc_info()[2]
print tb.tb_lineno

You may also have a look at the traceback module, e. g.:

traceback.print_exc()

Peter
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Re: [python-win32] How to get all the variables in a python shell

[Tim Golden]

[Bizarrely, my mail system seems to be randomly misfiring.
If you've already seen this, please ignore!]

Tim Golden wrote:
Sorry, having seen Roger D's memcached suggestion, I realise I may
have misinterpreted your requirement. I thought that you wanted
a Python interpreter session to share its objects to another window,
hence my IPython suggestion. If you're writing your own console app
and want to share stuff, then there's any number of IPC possibilities.

Roger's already mentioned memcached which I've no more than a
passing knowledge of. But Pyro [1] is often a good bet for these
things, and the pyprocessing [2] module is gaining a fair bit of
traction at the moment. (To name just two out of many).

TJG

[1] http://pyro.sf.net
[2] http://pyprocessing.berlios.de/

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Strange thing with types

[TYR]

I'm doing some data normalisation, which involves data from a Web site
being extracted with BeautifulSoup, cleaned up with a regex, then
having the current year as returned by time()'s tm_year attribute
inserted, before the data is concatenated with string.join() and fed
to time.strptime().

Here's some code:
timeinput = re.split('[\s:-]', rawtime)
print timeinput #trace statement
print year #trace statement
t = timeinput.insert(2, year)
print t #trace statement
t1 = string.join(t, '')
timeobject = time.strptime(t1, "%d %b %Y %H %M")

year is a Unicode string; so is the data in rawtime (BeautifulSoup
gives you Unicode, dammit). And here's the output:

[u'29', u'May', u'01', u'00'] (OK, so the regex is working)
2008 (OK, so the year is a year)
None (...but what's this?)
Traceback (most recent call last):
  File "bothv2.py", line 71, in 
t1 = string.join(t, '')
  File "/usr/lib/python2.5/string.py", line 316, in join
return sep.join(words)
TypeError
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Re: seg. fault with Py_BuildValue?

[Diez B. Roggisch]

Christian Meesters wrote:

> Hi
> 
> I'm having trouble with Py_BuildValue. I was able to pinpoint the
> following statement as the one causing a seg. fault with my script:
> 
> static PyObject * funcname(PyObject *self, PyObject *args) {
> ...
>   return Py_BuildValue("(OO)", x, y);
> }
> where x & y are both of type PyObject.
> 
> Any suggestions here? Do I need to handle the output of Py_BuildValue
> somehow before returning? How? Need to decref x & y before returning?

Just a guess - but according to the docs of Py_BuildValue it will return a
tuple already when given a format string of several format units.

What happens if you get rid of the ()?

Diez
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Re: Any way to loop through object variables?

[paul]

Dave Challis schrieb:

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Ah thanks, vars(...) was exactly what I was after.  I'd come across
dir() before, but this returns more than I need.

It seems vars() misses class attributes tho...

cheers
 Paul

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Re: Tuple of coordinates

[Benjamin Kaplan]

On Thu, May 29, 2008 at 8:16 AM, [EMAIL PROTECTED] <
[EMAIL PROTECTED]> wrote:

> Hi,
>
> i am using a software which uses python as its scripting language. I
> want to generate a list of coordinates more or less this way:
>
> for i in (beg, end, step):
> for j in (beg, end, step):
>  for k in (beg, end, step):
> .
>
> Coords =  ((i1,j1,k1), (i2,j2,k2), ...,(in,jn.kn))
>
>
> Can anyone give me some advice on how to achieve this ? I got a little
> idea, but still need to keep working til i get it. Thanks in advance,
>

The pseudo-code and the intended result are two completely different things.
The pseudo-code would give you [(i1,j1,k1),(i1,j1,k2),(i1,j2,k1)...]. That
code would be written

coords = list()
for i in xrange(beg, end, step) :
   for j in xrange(beg, end, step) :
  for k in xrange(beg, end, step) :
 coords.append((i,j,k))

for the result you gave, you would do

i = xrange(beg, end, step)
j = xrange(beg, end, step)
k = xrange(beg, end, step)
coords = zip(i,j,k)


>
> Victor
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>
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feedparser html sanitizion how-to disable it

[sebey]

ok so I know about why its good but I am building a website that
imports rss feeds form external place in this case Talkshoe.com and
feedparser seens to think that podcast.feed.description has html in it
and same with podcast.entries[0].description so how can I disable it

p.s. new to python so baby speak would be greatly appercated thank
you
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Re: Finding file details...

[Tim Golden]

Kalibr wrote:

On May 29, 7:55 pm, Tim Golden <[EMAIL PROTECTED]> wrote:

You don't say, but I assume you're on Windows since you mention
GetFileVersionInfo (which doesn't have anything to do with media
files, by the way) and WMA. There may be packages out there
to do all this already but if not you'll need to pull in a few disparate
modules and mix'n'match.

While ID3 readers (which determine the metadata for MP3) are reasonably
common few of them come ready-compiled for Windows. I've used Ned
Batchelder's id3reader [1] successfully for simple tasks so you might try
that. On the WMA side, you can automate Windows Media Player to get
metadata. (And it might work for .mp3; I've not tried).


import win32com.client

player = win32com.client.gencache.EnsureDispatch ("WMPlayer.OCX")
wmedia = player.mediaCollection.add (r"c:\temp\bells.mp3")
try:
  artist = wmedia.getItemInfo ("Artist")
finally:
  player.mediaCollection.remove (wmedia, False)

print "bells.mp3 has artist", artist



You're going to have to dig around for docs on this one. And it's not
pretty. Try starting from:

http://msdn.microsoft.com/en-us/library/bb249009(VS.85).aspx

TJG

[1]http://nedbatchelder.com/code/modules/id3reader.html


Hmm, thanks for the info. Yes, I am using Winders (Vista to be exact)
and I just assumed that there must be a way to programmatically get
the stuff you get from choosing properties in the right click menu.


Ah. You didn't quite say that. Well, the thing is that the stuff in
the right-click menu (I think this is the case) comes from several
different sources. Some of it's held in Alternate
Data Streams. Some is Structured Storage within the docs themselves.
Some is simply, eg, ID3 data held in an MP3 file etc. I don't
think it all comes from one place. Again, I think.


But I guess there isn't (hard to believe, because I can't see MS hard-
coding each and every file format's metadata into it's OS). I might
have to learn more about the command prompt ( I hear there is a module
for fiddling with it) and work from there.


If you come up with useful info, do post back here. It's an area several
people have enquired about.

TJG
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boost

[deepest1]

Hi everybody.

I'm trying to use boost, but just don't know how to set it up.

My os is winXP (installed on disk D).
Python is installed in D:\Python25
MigGW compiler is installed in D:\MinGW (i downloaded it because djgpp 
is making much more errors with bjam)

I have downloaded boost_1_35_0.zip and boost-jam-3.1.16-1-ntx86.zip,
extracted boost_1_35_0.zip to D:\Program Files (so I have now D:\Program 
Files\boost_1_35_0), extracted there bjam and used bjam in cmd:

bjam --build-dir="D:\Program Files\boost_1_35_0" --toolset=gcc stage

I got 12 failures and 8 warnings from this (other few hundrds were ok)


I'm now trying to compile World.cpp and use it from python


World.cpp:
--
#include "boost/python.hpp"
using namespace boost::python;

BOOST_PYTHON_MODULE(hello)
{
class_("World")
.def("greet", &World::greet)
.def("set", &World::set)
;
}


struct World
{
void set(std::string msg) { this->msg = msg; }
std::string greet() { return msg; }
std::string msg;
};
--



When trying to compile it I get:

E:\Source>g++ World.cpp
World.cpp:1:28: boost/python.hpp: No such file or directory
World.cpp:2: error: `boost' has not been declared
World.cpp:2: error: `python' is not a namespace-name
World.cpp:2: error: expected namespace-name before ';' token
World.cpp:4: error: expected constructor, destructor, or type conversion 
before
'(' token
World.cpp:15: error: `std::string' has not been declared
World.cpp:15: error: ISO C++ forbids declaration of `msg' with no type
World.cpp:16: error: using-declaration for non-member at class scope
World.cpp:16: error: expected `;' before "greet"
World.cpp:17: error: expected `;' before "std"
World.cpp:17: error: using-declaration for non-member at class scope
World.cpp:17: error: expected `;' before "msg"
World.cpp: In member function `void World::set(int)':
World.cpp:15: error: 'struct World' has no member named 'msg'



What have i done wrong and what should have been done instead?

Thank you in advance. :)
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Re: seg. fault with Py_BuildValue?

[Christian Meesters]

> What happens if you get rid of the ()?
Can't see any difference.


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Re: Strange thing with types

[TYR]

On May 29, 2:23 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote:
> TYR wrote:
> > I'm doing some data normalisation, which involves data from a Web site
> > being extracted with BeautifulSoup, cleaned up with a regex, then
> > having the current year as returned by time()'s tm_year attribute
> > inserted, before the data is concatenated with string.join() and fed
> > to time.strptime().
>
> > Here's some code:
> > timeinput = re.split('[\s:-]', rawtime)
> > print timeinput #trace statement
> > print year #trace statement
> > t = timeinput.insert(2, year)
> > print t #trace statement
> > t1 = string.join(t, '')
> > timeobject = time.strptime(t1, "%d %b %Y %H %M")
>
> > year is a Unicode string; so is the data in rawtime (BeautifulSoup
> > gives you Unicode, dammit). And here's the output:
>
> > [u'29', u'May', u'01', u'00'] (OK, so the regex is working)
> > 2008 (OK, so the year is a year)
> > None (...but what's this?)
> > Traceback (most recent call last):
> >   File "bothv2.py", line 71, in 
> > t1 = string.join(t, '')
> >   File "/usr/lib/python2.5/string.py", line 316, in join
> > return sep.join(words)
> > TypeError
>
> First - don't use module string anymore. Use e.g.
>
> ''.join(t)
>
> Second, you can only join strings. but year is an integer. So convert it to
> a string first:
>
> t = timeinput.insert(2, str(year))
>
> Diez

Yes, tm_year is converted to a unicode string elsewhere in the program.
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Re: Strange thing with types

[TYR]

On May 29, 2:24 pm, alex23 <[EMAIL PROTECTED]> wrote:
> On May 29, 11:09 pm, TYR <[EMAIL PROTECTED]> wrote:
>
>
>
> > I'm doing some data normalisation, which involves data from a Web site
> > being extracted with BeautifulSoup, cleaned up with a regex, then
> > having the current year as returned by time()'s tm_year attribute
> > inserted, before the data is concatenated with string.join() and fed
> > to time.strptime().
>
> > Here's some code:
> > timeinput = re.split('[\s:-]', rawtime)
> > print timeinput #trace statement
> > print year #trace statement
> > t = timeinput.insert(2, year)
> > print t #trace statement
> > t1 = string.join(t, '')
> > timeobject = time.strptime(t1, "%d %b %Y %H %M")
>
> > year is a Unicode string; so is the data in rawtime (BeautifulSoup
> > gives you Unicode, dammit). And here's the output:
>
> > [u'29', u'May', u'01', u'00'] (OK, so the regex is working)
> > 2008 (OK, so the year is a year)
> > None (...but what's this?)
> > Traceback (most recent call last):
> >   File "bothv2.py", line 71, in 
> > t1 = string.join(t, '')
> >   File "/usr/lib/python2.5/string.py", line 316, in join
> > return sep.join(words)
> > TypeError
>
> list.insert modifies the list in-place:
>
> >>> l = [1,2,3]
> >>> l.insert(2,4)
> >>> l
>
> [1, 2, 4, 3]
>
> It also returns None, which is what you're assigning to 't' and then
> trying to join.
>
> Replace your usage of 't' with 'timeinput' and it should work.

Thank you.
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adobe flex; return xml via turbogears/django

[Sells, Fred]

please excuse slightly off-topic; cannot access turbogears mailing list at the 
moment.

There was an excellent video by James Ward that showed using turbogears to 
return json data to adoble's flex UI.  It simply used

@expose("JSON")
def ():
...
return dict(x=1, ...)

Is there any equivalent for xml, such as
@expose("XML")
def 
return myElementTreeRoot

I need to have more attribute data (for a grid) than I can cleanly do in json 
and while pyamf might do the trick, It adds a layer of "magic code" that I 
cannot sell to my team.  Also with xml and json, I can do my UI design with the 
url pointing to a test data file, then build the backend to match.

any ideas?

thanks

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have received this communication in error, please notify the sender
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Re: feedparser html sanitizion how-to disable it

[sebey]

oh sorry here is the rss feed I am using

http://recordings.talkshoe.com/rss39293.xml

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Re: seg. fault with Py_BuildValue?

[Christian Heimes]

Christian Meesters schrieb:
> Hi
> 
> I'm having trouble with Py_BuildValue. I was able to pinpoint the following
> statement as the one causing a seg. fault with my script:
> 
> static PyObject * funcname(PyObject *self, PyObject *args) {
> 
>   return Py_BuildValue("(OO)", x, y);
> }
> where x & y are both of type PyObject.
> 
> Any suggestions here? Do I need to handle the output of Py_BuildValue
> somehow before returning? How? Need to decref x & y before returning?

Check if either x or y are NULL.

Christian

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Re: adobe flex; return xml via turbogears/django

[Diez B. Roggisch]

Sells, Fred wrote:

> please excuse slightly off-topic; cannot access turbogears mailing list at
> the moment.
> 
> There was an excellent video by James Ward that showed using turbogears to
> return json data to adoble's flex UI.  It simply used
> 
> @expose("JSON")
> def ():
> ...
> return dict(x=1, ...)
> 
> Is there any equivalent for xml, such as
> @expose("XML")
> def 
> return myElementTreeRoot
> 
> I need to have more attribute data (for a grid) than I can cleanly do in
> json and while pyamf might do the trick, It adds a layer of "magic code"
> that I cannot sell to my team.  Also with xml and json, I can do my UI
> design with the url pointing to a test data file, then build the backend
> to match.
> 
> any ideas?

Why don't you create KID-template like this:

${root}

and in the controller say

@expose("thexmltemplate")
def ...
   return dict(root=myElementTreeRoot)

Diez
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Re: BadStatusLine error

[Jim]

On May 28, 11:24 am, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote:
> Jim wrote:
> > Hi
>
> > I get a BadStatusLine error (indicated below). Can anyone help with
> > how to
> > catch error in code before abort?
>
> http://docs.python.org/tut/node10.html
>
> Diez

Thanks Diez docs help. Jim

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Re: Finding file details...

[Mike Driscoll]

On May 29, 5:26 am, Kalibr <[EMAIL PROTECTED]> wrote:
> On May 29, 7:55 pm, Tim Golden <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > You don't say, but I assume you're on Windows since you mention
> > GetFileVersionInfo (which doesn't have anything to do with media
> > files, by the way) and WMA. There may be packages out there
> > to do all this already but if not you'll need to pull in a few disparate
> > modules and mix'n'match.
>
> > While ID3 readers (which determine the metadata for MP3) are reasonably
> > common few of them come ready-compiled for Windows. I've used Ned
> > Batchelder's id3reader [1] successfully for simple tasks so you might try
> > that. On the WMA side, you can automate Windows Media Player to get
> > metadata. (And it might work for .mp3; I've not tried).
>
> > 
> > import win32com.client
>
> > player = win32com.client.gencache.EnsureDispatch ("WMPlayer.OCX")
> > wmedia = player.mediaCollection.add (r"c:\temp\bells.mp3")
> > try:
> >   artist = wmedia.getItemInfo ("Artist")
> > finally:
> >   player.mediaCollection.remove (wmedia, False)
>
> > print "bells.mp3 has artist", artist
>
> > 
>
> > You're going to have to dig around for docs on this one. And it's not
> > pretty. Try starting from:
>
> >http://msdn.microsoft.com/en-us/library/bb249009(VS.85).aspx
>
> > TJG
>
> > [1]http://nedbatchelder.com/code/modules/id3reader.html
>
> Hmm, thanks for the info. Yes, I am using Winders (Vista to be exact)
> and I just assumed that there must be a way to programmatically get
> the stuff you get from choosing properties in the right click menu.
> But I guess there isn't (hard to believe, because I can't see MS hard-
> coding each and every file format's metadata into it's OS). I might
> have to learn more about the command prompt ( I hear there is a module
> for fiddling with it) and work from there.
>
> Cheers for the links though, I will be checking them out :)

You might also check out the ID3 library:

http://id3-py.sourceforge.net/

It doesn't look like it's been updated for a few years. I tested it on
XP and it seems to work though.

I also found this snippet, but it's pretty rudimentary:

http://snipplr.com/view/1624/python--get-id3-from-mp3-file/

Finally, check out the ID3 Handling section on this site:

http://wiki.python.org/moin/UsefulModules

---
Mike

Blog: http://blog.pythonlibrary.org/
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bit parsing from file

[[EMAIL PROTECTED]]

Hello,

I'm tring to make a cutting script.
The problem is the following, i have a sample pattern, for
example :'11101110' (0xEE)
That is the sign of the data begining.
How can i cut a file if the byte stepping is not the same, for
example:

file=open('test.bin','rb')
data=file.read()
print binascii.hexlify(data)# BB9A (1011101110011010)
file.close()

so i need to cut the first two bit and start to writeout the bit
stream to another file
If somebody have an idea to do this, please share with me.
Thanx

Rew
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Re: Python and Flaming Thunder

[Dan Upton]

On Thu, May 29, 2008 at 3:36 AM, Duncan Booth
<[EMAIL PROTECTED]> wrote:
> Dave Parker <[EMAIL PROTECTED]> wrote:
>
>> Catch doesn't return just error types or numbers, it can return any
>> object returned by the statements that are being caught; catch doesn't
>> care what type they are.  For example:
>>
>>   Writeline catch(set x to "hello world".).
>>
>> will write "hello world".
>
> I really don't get this. Surely the point about an error being thrown to a
> catch statement is that the error path is separate from the normal
> execution path? What you are doing here is ensuring that unexpected errors
> have no chance at all of propagating up to the top level: they are
> invariably going to get caught by some other handler that was installed
> just because someone was too lazy to write a set statement followed by a
> writeline.

It also looks like an overloading of catch, semantically similar to the C:

int retcode;
if( retcode = doSomethingThatReturns0or1() ) printf("Hello world");

Again, I don't think you want to start overloading your
exception-handling mechanism.  If you want a set expression to be
equal to the l-value at the end, that's fine, but there's no reason
that catch should evaluate to an object or an integral- or real-valued
exception in error cases, or of the last statement of the block if
there's no error.  (Evaluating a block to be equal to its last
statement is okay, I guess; I know at least that there's a call in
Scheme that lets you do a more imperative programming style in the
functional language--whether that's a good thing is probably a holy
war.)  I just think if you're shooting for an easily understandable
language, overloading error handling requires more thought on the
programmer's part, not less, because they have to reason about all
outcomes.
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Re: Custom log handler and logging.config.fileConfig()

[Lowell Alleman]

Is there any reason not to do this assignment in the "myhandler.py"
directly?  This would save a step for each application that needs to
use it.

Starting from your example, it would now look like this:

# -- myhandler.py ---
import logging.handlers

class MySpecialHandler(logging.handlers.RotatingFileHandler):
def __init__(self, fn):
logging.handlers.RotatingFileHandler.__init__(self, fn,
   maxBytes=2000, backupCount=3)

# Register handler in the "logging.handlers" namespace
logging.handlers.MySpecialHandler = MySpecialHandler


# -- app.py ---
import logging.handlers, logging.config
import myhandler

logging.config.fileConfig("logging.ini")
...


> Hi Lowell,
>
> I think it's OK to use the logging.handlers namespace to add your
> custom handlers - after all, the handlers namespace is for holding
> handlers other than the basic ones included in "logging". So...
>
> # -- myhandler.py ---
> import logging.handlers
>
> class MySpecialHandler(logging.handlers.RotatingFileHandler):
>def __init__(self, fn):
>logging.handlers.RotatingFileHandler.__init__(self, fn,
> maxBytes=2000, backupCount=3)
>
>
> # -- logging.ini ---
> [loggers]
> keys=root
>
> [handlers]
> keys=hand01
>
> [formatters]
> keys=form01
>
> [logger_root]
> level=NOTSET
> handlers=hand01
>
> [handler_hand01]
> class=handlers.MySpecialHandler
> level=NOTSET
> formatter=form01
> args=("rotating.log",)
>
> [formatter_form01]
> format=%(asctime)s %(levelname)s %(message)s
> datefmt=
> class=Formatter
>
> # -- app.py ---
> import logging.handlers, logging.config
> from myhandler import MySpecialHandler
>
> logging.handlers.MySpecialHandler = MySpecialHandler
>
> logging.config.fileConfig("logging.ini")
>
> logger = logging.getLogger("test")
>
> for i in xrange(100):
>logger.debug("Message no. %d", i)
>
>
> should produce the expected results.
> --
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mysqldb install problem

[Tommy Grav]

I am trying to install mysqldb-1.2.2 on my PPC running 10.5.2 and  
Activepython 2.5.1.1

when I get this error:

running build
running build_py
copying MySQLdb/release.py -> build/lib.macosx-10.3-fat-2.5/MySQLdb
running build_ext
building '_mysql' extension
gcc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fno-strict-aliasing - 
Wno-long-double -no-cpp-precomp -mno-fused-madd -fPIC -fno-common - 
dynamic -DNDEBUG -g -O3 -Wall -Wstrict-prototypes - 
Dversion_info=(1,2,2,'final',0) -D__version__=1.2.2 -I/usr/local/mysql/ 
include -I/Library/Frameworks/Python.framework/Versions/2.5/include/ 
python2.5 -c _mysql.c -o build/temp.macosx-10.3-fat-2.5/_mysql.o -g - 
Os -arch ppc64 -fno-common -D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE  
-DSIGNALS_DONT_BREAK_READ -DIGNORE_SIGHUP_SIGQUIT - 
DDONT_DECLARE_CXA_PURE_VIRTUAL
In file included from /Library/Frameworks/Python.framework/Versions/ 
2.5/include/python2.5/Python.h:57,

 from pymemcompat.h:10,
 from _mysql.c:29:
/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5/ 
pyport.h:734:2: error: #error "LONG_BIT definition appears wrong for  
platform (bad gcc/glibc config?)."

In file included from _mysql.c:35:
/usr/local/mysql/include/my_config.h:1095:1: warning: "SIZEOF_LONG"  
redefined
In file included from /Library/Frameworks/Python.framework/Versions/ 
2.5/include/python2.5/Python.h:8,

 from pymemcompat.h:10,
 from _mysql.c:29:
/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5/ 
pyconfig.h:807:1: warning: this is the location of the previous  
definition

error: command 'gcc' failed with exit status 1

Anyone know what is going on?

Cheers
  Tommy
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Re: code of a function

[Anand Patil]

On May 29, 2008, at 9:38 AM, Gary Herron wrote:

Dark Wind wrote:

Hi,

Is there any command in Python which gives the code for a function  
like just typing the name of a function (say svd) in R returns its  
code.


Thank you


Nope.


If you're using IPython, you can do svd?? .

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Re: Python and Flaming Thunder

[Duncan Booth]

"Dan Upton" <[EMAIL PROTECTED]> wrote:

> On Thu, May 29, 2008 at 3:36 AM, Duncan Booth
><[EMAIL PROTECTED]> wrote:
>> Dave Parker <[EMAIL PROTECTED]> wrote:
>>
>>> Catch doesn't return just error types or numbers, it can return any
>>> object returned by the statements that are being caught; catch
>>> doesn't care what type they are.  For example:
>>>
>>>   Writeline catch(set x to "hello world".).
>>>
>>> will write "hello world".
>>
>> I really don't get this. Surely the point about an error being thrown
>> to a catch statement is that the error path is separate from the
>> normal execution path? What you are doing here is ensuring that
>> unexpected errors have no chance at all of propagating up to the top
>> level: they are invariably going to get caught by some other handler
>> that was installed just because someone was too lazy to write a set
>> statement followed by a writeline.
> 
> It also looks like an overloading of catch, semantically similar to
> the C: 
> 
> int retcode;
> if( retcode = doSomethingThatReturns0or1() ) printf("Hello world");
> 
> Again, I don't think you want to start overloading your
> exception-handling mechanism.  If you want a set expression to be
> equal to the l-value at the end, that's fine, but there's no reason
> that catch should evaluate to an object or an integral- or real-valued
> exception in error cases, or of the last statement of the block if
> there's no error.  (Evaluating a block to be equal to its last
> statement is okay, I guess; I know at least that there's a call in
> Scheme that lets you do a more imperative programming style in the
> functional language--whether that's a good thing is probably a holy
> war.)  I just think if you're shooting for an easily understandable
> language, overloading error handling requires more thought on the
> programmer's part, not less, because they have to reason about all
> outcomes.
> 
I like BCPL's way of handling block expressions: VALOF is followed by a 
block of statements and within that block RESULTIS gives the result. 
This lets you exit the block early (just like a return statement does), 
but without returning from the current procedure (unless of course the 
entire body of the procedure is a VALOF block). Naturally the result has 
to be explicitly specified (otherwise the value is undefined).

Maybe FT should do something similar:

   Writeline value of (set x to "hello world". Result is x.).

and catch can then stick to catching errors.

-- 
Duncan Booth http://kupuguy.blogspot.com
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Re: Finding file details...

[Roger Upole]

Kalibr wrote:
> I've been trying to figure out how to find the details of files
> (specifically music for now) for a little sorting script I'm making,
> My aim is to get details on the artist, album, and genre for mp3 and
> wma files (possibly more in the future). My closest match was when I
> stumbled accross PyMedia, but it only supports up to 2.4 (I have 2.5).
> Now I see a bit mentioned on GetFileVersionInfo, but that doesn't seem
> to help (and most of it went over my head). Is there any module I can
> use to find this sort of data? I'm trying to not make it specialised
> in music, because I may want to extend this to picture, movie, text
> etc. files in the future. Any ideas how I could go about this?

You can use the shell COM objects to access media properties
as shown by Explorer.

import win32com.client
sh=win32com.client.Dispatch('Shell.Application')

folder= r'M:\Music\Bob Dylan\Highway 61 Revisited'
ns=sh.NameSpace(folder)

## the column index for Artist may vary from folder to folder
for c in range(0,255):
colname=ns.GetDetailsOf(None, c)
if colname=='Artists':  ## This shows up as just Artist on XP
for i in ns.Items():
artist=ns.GetDetailsOf(i, c)
if artist:
print ns.GetDetailsOf(i, 0), artist
break


Roger



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Re: Tuple of coordinates

[Gary Herron]

[EMAIL PROTECTED] wrote:

Hi,

i am using a software which uses python as its scripting language. I
want to generate a list of coordinates more or less this way:

for i in (beg, end, step):
 for j in (beg, end, step):
  for k in (beg, end, step):
.

Coords =  ((i1,j1,k1), (i2,j2,k2), ...,(in,jn.kn))
  


Your statement of the problem makes it look like all three coordinates 
cover the same sequence of values.  Is that true? Or does i's range  
(beg, end, step) differ from j's and k's.If they differ, are they 
all the same length?


You pseudo-code makes it look like you want all combinations, but your 
sample output does not indicate that.  Which is it, [(1,1,1), (2,2,2)] 
or [(1,1,1), (1,1,2),(1,2,1),(1,2,2), ...]?


Depending on the answers to those questions, one of the following list 
comprehensions may demonstrate how to achieve a solution.


>>> a = range(2,6,2)
>>> b = range(3,7,2)
>>> c = range(10,14,2)
>>> print a,b,c
[2, 4] [3, 5] [10, 12]
>>> [(i,j,k) for i,j,k in zip(a,b,c)]  #  Using zip process three lists 
in lock-step

[(2, 3, 10), (4, 5, 12)]
>>> [(i,j,k) for i in a  for j in b  for k in c]   #Nested loop give 
all possible combos.
[(2, 3, 10), (2, 3, 12), (2, 5, 10), (2, 5, 12), (4, 3, 10), (4, 3, 12), 
(4, 5, 10), (4, 5, 12)]

>>>

Gary Herron



Can anyone give me some advice on how to achieve this ? I got a little
idea, but still need to keep working til i get it. Thanks in advance,


Victor
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Re: boost

[Ulrich Eckhardt]

deepest1 wrote:
> bjam --build-dir="D:\Program Files\boost_1_35_0" --toolset=gcc stage
> 
> I got 12 failures and 8 warnings from this (other few hundrds were ok)

Hmm, I remember trying to use Boost 1.35 with Python 2.5 on my Debian system
and also having problems, are you sure that at least the Python helper libs
are correctly compiled?

> E:\Source>g++ World.cpp
> World.cpp:1:28: boost/python.hpp: No such file or directory

Try -I "D:\Program Files\boost_1_35_0" as additional argument. Further, you
will need to tell g++ to link with the according boost library
(-lboost_python or something like that) and where it can find that lib
(-L"D:\Program Files\boost_1_35_0\stage").

Uli

-- 
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Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932

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[OT] Re: FW: php vs python

[J. Cliff Dyer]

On Thu, 2008-05-29 at 08:47 +1200, Phil Runciman wrote:
> The Inuit have 13 terms for snow. Microsoft advocate DSLs. Why have
> DSLs
> if language does not matter?
> 

For that matter, the English have several terms for snow as well.

snow
flurry
blizzard
powder
pack
flakes
crystals
sleet
slush

And in some contexts (http://www.abc-of-snowboarding.com/snowtypes.asp)

crud
crust
rime
graupel
hail

That's 14.  Inuits are unimaginative punks. ;)

Cheers,
Cliff

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should I put old or new style classes in my book?

[allendowney]

Hi All,

I am working on a revised edition of How To Think Like a Computer
Scientist,
which is going to be called Think Python.  It will be published by
Cambridge
University Press, but there will still be a free version under the GNU
FDL.

You can see the latest version at thinkpython.com; I am revising now,
so
I welcome all comments, suggestions, corrections, etc.

Anyway, I am posting to ask about the current status of new style
classes.
I am planning to present only one style in the book, because the
differences
between them don't matter for anything I am doing in the book.

The current edition of the book presents old style classes.  I am
considering
switching to new style classes on the assumption that this should be
the default
choice for new programs.  The drawback is that a lot of the online
documentation
still uses old style classes.

Thanks for any guidance you can provide.

Cheers,
Allen

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Re: ctypes, function pointers and a lot of trouble

[Matt]

Okay, thanks a lot for your reply Nick, I think you pushed me back on 
the right way.


Now I started with trying to implement the callback functions and am 
stuck at the following point:


I define my classes/structures/unions:

--CODE-

class cdStream(Structure):
_fields_ = [("contextH", c_uint),
 ("open", c_void_p),
 ("close", c_void_p),
 ("read", c_void_p),
 ("write", c_void_p),
 ("seek", c_void_p),
 ("tell", c_void_p)]

class memunion(Union):
_fields_ = [("lpszFileName", c_char_p),
 ("pStream", cdStream)]


class cdStgMedium(Structure):
_fields_ = [("Type", c_uint),
 ("u", memunion)]

--\CODE

then i define my functions (right now I do just nothing) and at the same 
time I define the datatypes like they're listed in my C sample program:



--CODE-

def pystreamopen (contextH, mode, pErr):
pass

cstreamopen = CFUNCTYPE(c_uint, c_ushort, c_uint)

def pystreamclose (contextH, pErr):
pass

cstreamclose = CFUNCTYPE(c_uint, c_uint)

def pystreamread (contextH, pBuf, pBufsize, pErr):
pass

cstreamread = CFUNCTYPE(c_uint, c_void_p, c_uint, c_uint)

def pystreamtell (contextH, pErr):
pass

cstreamtell = CFUNCTYPE(c_uint, c_uint)

def pystreamwrite (contextH, origin, offset, pErr):
print "writing..."
pass

cstreamwrite = CFUNCTYPE(c_uint, c_void_p, c_uint, c_uint)

--\CODE

and now the problem starts: i want the pointers in the cdStream 
Structure point at my functions and tried to do it the following way:



--CODE-

data = cdStgMedium()
data.type = 0
data.u.pStream.contextH = c_uint(3) #must be some kind of identifier.
data.u.pStream.open = cstreamopen(pystreamopen)
data.u.pStream.close = cstreamclose(pystreamclose)
data.u.pStream.write = cstreamwrite(pystreamwrite)
data.u.pStream.tell = cstreamtell(pystreamtell)
data.u.pStream.read = cstreamread(pystreamread)

--\CODE

unfortunately that doesn't work because Python returns a TypeError: 
incompatible types, CFunctionType instance instead of c_void_p instance


Any ideas/help (please)?

Best regards,
Matt


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Re: should I put old or new style classes in my book?

[Matthieu Brucher]

Hi,

New style classes should be put as the default. This is what I did, based on
the principle that new classes were introduces in Python 2.2 and that we are
now at 2.5 and soon 2.6.
Tutorials that use old style classes may be old and perhaps won't be updated
ever. That's not a problem. Just tell people that there are two styles, but
that new style classes are far more powerful and do what you think they
should do.

Matthieu

2008/5/29 <[EMAIL PROTECTED]>:

> Hi All,
>
> I am working on a revised edition of How To Think Like a Computer
> Scientist,
> which is going to be called Think Python.  It will be published by
> Cambridge
> University Press, but there will still be a free version under the GNU
> FDL.
>
> You can see the latest version at thinkpython.com; I am revising now,
> so
> I welcome all comments, suggestions, corrections, etc.
>
> Anyway, I am posting to ask about the current status of new style
> classes.
> I am planning to present only one style in the book, because the
> differences
> between them don't matter for anything I am doing in the book.
>
> The current edition of the book presents old style classes.  I am
> considering
> switching to new style classes on the assumption that this should be
> the default
> choice for new programs.  The drawback is that a lot of the online
> documentation
> still uses old style classes.
>
> Thanks for any guidance you can provide.
>
> Cheers,
> Allen
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
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Website : http://matthieu-brucher.developpez.com/
Blogs : http://matt.eifelle.com and http://blog.developpez.com/?blog=92
LinkedIn : http://www.linkedin.com/in/matthieubrucher
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Re: bit parsing from file

[Mensanator]

On May 29, 9:42�am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I'm tring to make a cutting script.
> The problem is the following, i have a sample pattern, for
> example :'11101110' (0xEE)
> That is the sign of the data begining.
> How can i cut a file if the byte stepping is not the same, for
> example:
>
> file=open('test.bin','rb')
> data=file.read()
> print binascii.hexlify(data) � � � � � �# BB9A (1011101110011010)
> file.close()
>
> so i need to cut the first two bit and start to writeout the bit
> stream to another file
> If somebody have an idea to do this, please share with me.
> Thanx

Cutting off the leading two bits isn't a problem,
but once you write out the byte 11101110  you are
left with 011010 which cannot be written as it's not
a byte. How do you plan to handle that? Add two bits
at the MSB (00011010) or two bits at the LSB (01101000)
or discard the fractional byte?

And do you always know what the bit offset is or
do you have to search for the 11101110 starting
pattern?

>
> Rew

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Re: bit parsing from file

[[EMAIL PROTECTED]]

On máj. 29, 18:26, Mensanator <[EMAIL PROTECTED]> wrote:
> On May 29, 9:42�am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > Hello,
>
> > I'm tring to make a cutting script.
> > The problem is the following, i have a sample pattern, for
> > example :'11101110' (0xEE)
> > That is the sign of the data begining.
> > How can i cut a file if the byte stepping is not the same, for
> > example:
>
> > file=open('test.bin','rb')
> > data=file.read()
> > print binascii.hexlify(data) � � � � � �# BB9A (1011101110011010)
> > file.close()
>
> > so i need to cut the first two bit and start to writeout the bit
> > stream to another file
> > If somebody have an idea to do this, please share with me.
> > Thanx
>
> Cutting off the leading two bits isn't a problem,
> but once you write out the byte 11101110  you are
> left with 011010 which cannot be written as it's not
> a byte. How do you plan to handle that? Add two bits
> at the MSB (00011010) or two bits at the LSB (01101000)
> or discard the fractional byte?
>
> And do you always know what the bit offset is or
> do you have to search for the 11101110 starting
> pattern?
>
Thank's for the reply,
Yes, I have to search for the pattern, the bit offset not always the
same.
for another thing, it's ok if i can fill up with zero at the LSB or
discard that byte. (the last byte not important)

Rew
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yum installs Tkinter in a way visible to only one python installation

[Rahul]

My RHEL yum package-manager comes with  Python-2.4.3. We also have a 
seperate Python-2.4.4 Installation on our box.

When I added Tkinter using 'yum install tkinter' it seems to have added it 
in a manner that it is exclusively visible to Python-2.4.3. I cannot import 
Tkinter from Python-2.4.4. 

What's the best way to work around this? 

-- 
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Re: Threads and import

[Rhamphoryncus]

On May 28, 1:14 pm, [EMAIL PROTECTED] wrote:
> Hi,
>
> I'm trying to work out some strange (to me) behaviour that I see when
> running a python script in two different ways (I've inherited some
> code that needs to be maintained and integrated with another lump of
> code). The sample script is:
>
> # Sample script, simply create a new thread and run a
> # regular expression match in it.
> import re
>
> import threading
> class TestThread(threading.Thread):
>
> def run(self):
> print('start')
> try:
> re.search('mmm', '')
> except Exception, e:
> print e
> print('finish')
>
> tmpThread = TestThread()
> tmpThread.start()
> tmpThread.join()
> import time
> for i in range(10):
> time.sleep(0.5)
> print i
>
> # end of sample script
>
> Now if I run this using:
>
> $ python ThreadTest.py
>
> then it behaves as expected, ie an output like:
>
> start
> finish
> 0
> 1
> 2
> ...
>
> But if I run it as follows (how the inherited code was started):
>
> $ python -c "import TestThread"
>
> then I just get:
>
> start
>
> I know how to get around the problem but could someone with more
> knowledge of how python works explain why this is the case?

For reasons I haven't figured out, child threads always acquire the
import lock.  Since the main thread is already in an import, and is
waiting for the child thread to finish, this deadlocks.

"python ThreadTest.py" doesn't deadlock because ThreadTest isn't
loaded as a module - it's loaded as a script.  A script doesn't hold
the import lock while it executes.

The solution is to move all the thread spawning and whatnot into a
main() function, use the "if __name__ == '__main__': main()" trick for
when you are a script, and if a module require the caller to do
ThreadTest.main() after importing.
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Re: Custom log handler and logging.config.fileConfig()

[Vinay Sajip]

On 29 May, 15:53, "Lowell Alleman" <[EMAIL PROTECTED]> wrote:
> Is there any reason not to do this assignment in the "myhandler.py"
> directly?  This would save a step for each application that needs to
> use it.
>
> Starting from your example, it would now look like this:
>
> # -- myhandler.py ---
> importlogging.handlers
>
> class MySpecialHandler(logging.handlers.RotatingFileHandler):
> def __init__(self, fn):
>logging.handlers.RotatingFileHandler.__init__(self, fn,
>maxBytes=2000, backupCount=3)
>
> # Register handler in the "logging.handlers" 
> namespacelogging.handlers.MySpecialHandler = MySpecialHandler
>
> # -- app.py ---
> importlogging.handlers,logging.config
> import myhandler
>
> logging.config.fileConfig("logging.ini")
> ...

Doing it the way you suggest should be fine.

Regards,

Vinay Sajip
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undocumented functions in pkgutil

[Michele Simionato]

I see that the pkgutil module has many useful functions which are
however undocumented.
Does anybody know why it is so? In particolar, can I safely use
pkg.walk_packages
without risking a change of interface in the future? I looks unlikely,
since pkgutil is
used in setuptools, but I want to be sure before relying on it.

Michele Simionato
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Re: should I put old or new style classes in my book?

[Benjamin Kaplan]

On Thu, May 29, 2008 at 12:07 PM, <[EMAIL PROTECTED]> wrote:

> Hi All,
>
> I am working on a revised edition of How To Think Like a Computer
> Scientist,
> which is going to be called Think Python.  It will be published by
> Cambridge
> University Press, but there will still be a free version under the GNU
> FDL.
>
> You can see the latest version at thinkpython.com; I am revising now,
> so
> I welcome all comments, suggestions, corrections, etc.
>
> Anyway, I am posting to ask about the current status of new style
> classes.
> I am planning to present only one style in the book, because the
> differences
> between them don't matter for anything I am doing in the book.
>
> The current edition of the book presents old style classes.  I am
> considering
> switching to new style classes on the assumption that this should be
> the default
> choice for new programs.  The drawback is that a lot of the online
> documentation
> still uses old style classes.
>
> Thanks for any guidance you can provide.
>
> Cheers,
> Allen
>  


Definitely go with the new-style classes. Python 3 is coming out soon, which
doesn't have classic classes.

http://docs.python.org/dev/3.0/whatsnew/3.0.html#new-class-and-metaclass-stuff
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RE: adobe flex; return xml via turbogears/django

[Sells, Fred]

Diez wrote: 
> Why don't you create KID-template like this:
> 
> ${root}
> 
> and in the controller say
> 
> @expose("thexmltemplate")
> def ...
>return dict(root=myElementTreeRoot)
> 
sounds good.  Does that "py:strip" remove the  and anything outside it.  
I'll be doing a flex style ajax call and it wants just the xml data tree.

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Re: should I put old or new style classes in my book?

[Jason]

On May 29, 10:07 am, [EMAIL PROTECTED] wrote:
> Hi All,
>
> I am working on a revised edition of How To Think Like a Computer
> Scientist,
> which is going to be called Think Python.  It will be published by
> Cambridge
> University Press, but there will still be a free version under the GNU
> FDL.
>
> You can see the latest version at thinkpython.com; I am revising now,
> so
> I welcome all comments, suggestions, corrections, etc.
>
> Anyway, I am posting to ask about the current status of new style
> classes.
> I am planning to present only one style in the book, because the
> differences
> between them don't matter for anything I am doing in the book.
>
> The current edition of the book presents old style classes.  I am
> considering
> switching to new style classes on the assumption that this should be
> the default
> choice for new programs.  The drawback is that a lot of the online
> documentation
> still uses old style classes.
>
> Thanks for any guidance you can provide.
>
> Cheers,
> Allen

I've got Python 3.0 alpha 2.  In this version, it looks like you can
define classes in either the old style or new style.  (I snipped the
top line a bit in the following example):

Python 3.0a2 (r30a2:59405M, Dec  7 2007, 15:23:28
Type "help", "copyright", "credits" or "license"
>>> class one(object): pass
...
>>> class two: pass
...
>>> two

>>> one

>>> type(one)

>>> type(two)

>>>

That said, old-style classes can't use the staticmethod or classmethod
properties correctly.  New-style classes better support multiple
inheritance and old-style classes can't use metaclasses.  Metaclasses,
and even multiple inheritance may be beyond the scope of your book,
though.

I'd recommend new-style classes myself, as it avoids some nasty subtle
problems if your readers move to more advanced techniques.  You are
correct, though, that some of the classes in the Python library use
the old style.

So, you might want to acknowledge that there are two ways of doing
classes, that a lot of old code uses the old way.  The new way adds
some powerful new techniques that may be beyond the scope of your
book.  In Python 3.0, it won't matter, as everything is a new-style
class anyway.

  --Jason
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Saving tif file from tricky webserver

[schweet1]

Greetings,

I am attempting to automate accessing and saving a file (a TIF) from
the following URL:

http://patimg1.uspto.gov/.DImg?Docid=US007376435&PageNum=1&IDKey=E21184B8FAD5

I have tried some methods using urllib, httplib, and
web32com.client(InternetExplorer), but haven't been successful.
Currently I am using (in Python 2.5)

import webbrowser

url = [see above]

webbrowser.open(url, new=0, autoraise=0)

When this is run a windows popup dialog opens asking me to Open, Save,
or Cancel.  However, if I query multiple such URLs, I do not want to
have to respond manually.  Is there a way I can use Python to save the
TIF?
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MACOSX_DEPLOYMENT_TARGET mismatch bug on Leopard using system Python

[Anand Patil]

Hi all,

I'm getting error messages like

distutils.errors.DistutilsPlatformError: $MACOSX_DEPLOYMENT_TARGET  
mismatch: now "10.3" but "10.5" during configure


on Leopard using system Python when trying to build a third-party  
module. Can this be fixed without installing a different distribution  
of Python? Googling the problem turns up fixes that involve  
configuring source distributions, unless I'm mistaken.


Thanks,
Anand Patil
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NYC Python User Group Meeting Announcement....

[John Clark]

Greetings!

The next New York City Python Users Group meeting is planned for June 17th, 
6:30pm at Daylife Inc. at 444 Broadway (between Howard St. and Grand St.) on
the 5th Floor. We welcome all those in the NYC area who are interested in 
Python to attend.

More information can be found on the users group wiki page:

http://www.nycpython.org

Hope to see you there!

-John Clark


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so funny...

[John]

http://sitscape.com/topic/funny

Just keep hit the "Surprise->" button there for amazing fun.
Click on "channel" will show you other topics, lots of fun!

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Python threads and memory usage

[Mike]

Hi,

I'm writing client-server application in Python. It's monitoring
system, where server listen and waits for TCP connections, and every
connection takes own thread. Every thread puts data from clients to
Queue and exits. Then there is one DB loader thread, which loads all
data from Queue to MySQL DB.

I observed, that every thread reserved some memory, and after exit
thread doesn't freed it. When i leaved my server working for 3 days,
then it takes 15% of 512MB memory (during that time about 15000
threads were created and stopped). When server starts it only takes
about 1% of memory.

I know that I can made client which connects once and keep this
session with server thread all time (it should resolve my problems),
but I'm curious if this is normal or it is something like memory leak.
Or maybe I'm doing something wrong :)

If You need I can paste all my code.

Regards
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Re: accessing class attributes

[eliben]

On May 29, 3:08 am, Matimus <[EMAIL PROTECTED]> wrote:
> > I have a game class, and the game has a state. Seeing that Python has
> > no enumeration type, at first I used strings to represent states:
> > "paused", "running", etc. But such a representation has many
> > negatives, so I decided to look at the Enum implementation given 
> > here:http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/413486
>
> I frequently use strings in place of enumeration in python. I have
> found it to be very useful. I'm curious about the _many negatives_ you
> have found?
>
> For example, I wrote a module and one of the parameters to a function
> was `mode`. Two of the modes were ALL_MODE and ONE_MODE.
>
> At first I enumerated the modes:
>
> MODES = ALL_MODE, ONE_MODE = 0, 1
>
> And code using the mode tended to look something like this:
>
> from package import module
> module.foo(mode=module.ALL_MODE)
>
> Of course, the following would also work, but isn't self descriptive:
>
> module.foo(mode=0)
>
> Then, after some user feedback I changed it to this:
>
> MODES = ALL_MODE, ONE_MODE = "all one".split()
>
> This maintained backwards compatabilty, but users could use the much
> more concise (but still readable) version:
>
> module.foo(mode="all")
>
> Since then, I have adopted using strings in place of enum types as a
> best practice.
>
> Matt

The problem with naming strings explicitly has to do with type safety.
If you make a mistake in a parameter's name, it won't be detected by
the interpreter and you can run into weird errors later. The other
problem is that all the possible options are not documented in one
convenient place, but you solved it by using a mixed approach of
uppercase "constants" having the values of strings.

Eli
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Remote Debugging for python.

[nkarkhan]

Newbie to python here..so bear with me.

I used to be able to gdb to a target machine running c/c++ code and
see where my program was hanging, crashing, executing..

How do I do that with python?
I have multi-threaded python programs running on a remote machine. I
want to se where they are at any instance.

If remote debugging is too much to ask for.. what about local
debugging?
Can i break into an executing program and see at source-level where my
pyhton program/process/thread is at?

Thank you,
Nitin.
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