date:20080519


All:

I've got a script that runs really slow because I'm reading from a stream a 
byte at a time:

// TERRIBLE
for y in range( height ):
for color in range(4):
for x in range( width ):
pixelComponent = fileIO.read(4)
buffer = unpack(!f,pixelComponent)   unpacks ONE float, 
but we now can do something with that pixel component.


I can speed this up dramatically if I did this:

// MUCH FASTER
for y in range( height ):
for color in range(4):
pixelComponent = fileIO.read(4*width)   GET a LOT more data 
from the stream into memory FIRST!!
for x in range( width ):
   buffer = unpack( ?? )  how do I get each float from the 
pixelComponent???


-M



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Rearranging elements (cont..)

All:
 
Say I have an array:
 
a = ([''],[''])
 
How do I make it so that I now have:
 
starting with first element (a[0])
new_arr[0] = 'r'
new_arr[1] = 'g'
new_arr[2] = 'b'
new_arr[3] = 'a'
new_arr[4] = 'r'
.
 
continuing through a[1] with the same new_arr
new_arr[N] = 'r'
new_arr[N+1] = 'g'

 
-M
 
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More on numpy trickiness.

All: Say I have an array: a = ([''],['']) How 
do I make it so that I now have: starting with first element (a[0])new_arr[0] = 
'r'new_arr[1] = 'g'new_arr[2] = 'b'new_arr[3] = 'a'new_arr[4] = 'r'. 
continuing through a[1] with the same new_arrnew_arr[N] = 'r'new_arr[N+1] = 
'g' -M
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arrays

All: Say I have an array: a = ([''],['']) How 
do I make it so that I now have: starting with first element (a[0])new_arr[0] = 
'r'new_arr[1] = 'g'new_arr[2] = 'b'new_arr[3] = 'a'new_arr[4] = 'r'. 
continuing through a[1] with the same new_arrnew_arr[N] = 'r'new_arr[N+1] = 
'g' -M
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Re: Classmethods are evil

2008-05-19 Thread Duncan Booth

Hans Nowak [EMAIL PROTECTED] wrote:

 The way I see it, a class method is really just sugar for a function
 operating on the class, living in the class namespace.  As such, they
 are basically redundant, and as you point out, they can always be
 replaced by a function outside the class (and in fact, this was what
 people did before they came along in 2.2).  Personally, I don't use
 them... but some people like them.  Different strokes, and all that...
 

In exactly the same way you could claim that a method is just sugar for a 
function operating on the instance living in the instance namespace. As 
such, you might think that they too are basically redundant, but they 
aren't: with instance methods you get the ability to override the method in 
a subclass without the caller needing to know whether they are calling the 
original method or an overridden version.

With class methods you also get the ability to override the method in a 
subclass, and again the caller doesn't need to know or care which variant 
when they call it.

Say you have a class hierarchy with a from_keys() class method. If you want 
to construct a new Foo you might call Foo.from_keys() without caring 
whether the method is the original one defined in one of Foo's base classes 
or a modified version specific to a Foo. If you were using functions then 
you would need to define a new from_keys() function for every class in a 
hierarchy, or at least for every different implementation in the hierarchy 
and the caller would need to be careful to call the correct one. So we end 
up with functions from_keys_Foo_or_Baz(cls) and from_keys_Bar() which is an 
unmaintainable mess.

-- 
Duncan Booth http://kupuguy.blogspot.com
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Re: default object comparison considered harmful?

2008-05-19 Thread A.T.Hofkamp

On 2008-05-16, Kay Schluehr [EMAIL PROTECTED] wrote:
 On 16 Mai, 10:03, A.T.Hofkamp [EMAIL PROTECTED] wrote:
 Hello all,

 Yesterday we found the cause of a bug that has caused problems for a long 
 time.
 It appeared to be the following:

 class A(object):
 pass

 print min(1.0, A())

 which is accepted by Python even though the A() object is not numerical in
 nature.

 The cause of this behavior seems to be the compare operation of the object
 class.

 Is there a way to disable this behavior in Python (other than deriving a new
 'object-like' class that doesn't do comparisons?)

 Sincerely,
 Albert

 Are you sure you don't want to use a statically typed language that
 captures all type errors just by inspecting your source code?

yes.

The problem here is that it isn't caught at all, neither at 'compile' time nor
at run-time. That means that the Python language considers this proper code.

Whether you make that decision by inspecting source code or at run-time is
irrelevant here.


Unfortunaly, we have to maintain Python 2.3 compability.
As a solution, I have created a new BaseObject class as follows:

class BaseObject(object):

Generic base class without default compare and hashing functions.

def __cmp__(self, other):
 Disable default compare method 
raise NotImplementedError

def __hash__(self):
 Disable default hashing method 
raise NotImplementedError(Implement me in class '%s'
% self.__class__.__name__)


Sincerely,
Albert
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Professional Grant Proposal Writing Workshop (August 2008: Manchester, New Hampshire)

2008-05-19 Thread Anthony Jones

The Grant Institute's Grants 101: Professional Grant Proposal Writing Workshop
will be heldin Manchester, New Hampshire on August 6 - 8, 2008. Interested development professionals, researchers, faculty, and graduate students should register as soon as possible, as demand means that seats will fill up quickly. Please forward, post, and distribute this e-mail to your colleagues and listservs.

All participants will receive certification in professional grant writing from the Institute. For more information call (888) 824 - 4424 (213-817-5308 outside US) or visit The Grant Institute at www.thegrantinstitute.com.

Please find the program description below:

The Grant Institute
Grants 101: Professional Grant Proposal Writing Workshop
will be held in
Manchester, New Hampshire
August 6 - 8, 2008
8:00 AM - 5:00 PM

The Grant Institute's Grants 101 course is an intensive and detailed introduction to the process, structure, and skill of professional proposal writing. This course is characterized by its ability to act as a thorough overview, introduction, and refresher at the same time. In this course, participants will learn the entire proposal writing process and complete the course with a solid understanding of not only the ideal proposal structure, but a holistic understanding of the essential factors,
which determine whether or not a program gets funded. Through the completion of interactive exercises and activities, participants will complement expert lectures by putting proven techniques into practice. This course is designed for both the beginner looking for a thorough introduction and the intermediate looking for a refresher course that will strengthen their grant acquisition skills. This class, simply put, is designed to get results by creating professional grant proposal writers.

Participants will become competent program planning and proposal writing professionals after successful completion of the Grants 101 course. In three active and informative days, students will be exposed to the art of successful grant writing practices, and led on a journey that ends with a masterful grant proposal.

Grants 101 consists of three (3) courses that will be completed during the three-day workshop.

(1) Fundamentals of Program Planning

This course is centered on the belief that "it's all about the program." This intensive course will teach professional program development essentials and program evaluation. While most grant writing "workshops" treat program development and evaluation as separate from the writing of a proposal, this class will teach students the relationship between overall program planning and grant writing.

(2) Professional Grant Writing

Designed for both the novice and experienced grant writer, this course will make each student an overall proposal writing specialist. In addition to teaching the basic components of a grant proposal, successful approaches, and the do's and don'ts of grant writing, this course is infused with expert principles that will lead to a mastery of the process. Strategy resides at the forefront of this course's intent to illustrate grant writing as an integrated, multidimensional, and dynamic endeavor.
Each student will learn to stop writing the grant and to start writing the story. Ultimately, this class will illustrate how each component of the grant proposal represents an opportunity to use proven techniques for generating support.

(3) Grant Research

At its foundation, this course will address the basics of foundation, corporation, and government grant research. However, this course will teach a strategic funding research approach that encourages students to see research not as something they do before they write a proposal, but as an integrated part of the grant seeking process. Students will be exposed to online and database research tools, as well as publications and directories that contain information about foundation, corporation, and
government grant opportunities. Focusing on funding sources and basic social science research, this course teaches students how to use research as part of a strategic grant acquisition effort.

Registration
$597.00 tuition includes all materials and certificates.

Each student will receive:
*The Grant Institute Certificate in Professional Grant Writing
*The Grant Institute's Guide to Successful Grant Writing
*The Grant Institute Grant Writer's Workbook with sample proposals, forms, and outlines

Registration Methods

1) On-Line- Complete the online registration form at www.thegrantinstitute.com under Register Now. We'll send your confirmation by e-mail.

2) By Phone - Call (888) 824 - 4424 (213-817-5308 outside US)to register by phone. Our friendly Program Coordinators will be happy to assist you and answer your questions.

3) By E-mail - Send an e-mail with your name, organization, and basic contact information to [EMAIL PROTECTED] and we will reserve your slot and send your Confirmation Packet.

You have

Re: how would you...?

2008-05-19 Thread Martin Sand Christensen

 inhahe == inhahe  [EMAIL PROTECTED] writes:
inhahe Btw, use float() to convert a textual GPA to a number.

It would be much better to use Decimal() instead of float(). A GPA of
3.6001 probably doesn't make much sense; this problem
doesn't arise when using the Decimal type.

Martin
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Re: Organizing a Python project

2008-05-19 Thread A.T.Hofkamp

On 2008-05-19, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
 Hello all,

 I'm starting work on what is going to become a fairly substantial
 Python project, and I'm trying to find the best way to organize
 everything. The project will consist of:

 - A few applications
 - Several small scripts and utilities
 - Unit tests and small interactive test programs
 - A number of custom libraries and modules that may be shared and
 referenced among all of the above

 I have the following general structure in mind:

 myproject/
   app1/
 main.py
 file1.py
 file2.py
 tests/
   test_abc.py
   test_xyz.py
   app2/
 ...
   scripts/
 script1.py
 script2.py
   shared/
 mylib1/
   file1.py
   file2.py
   tests/
 test_foo.py
 test_bar.py
 mylib2/
   ...


 The files that you might want to execute directly are:
   - Any of the main.py files under app*/
   - Any of the files under shared/
   - Any of the files under app*/tests or shared/mylib*/tests

 So, my questions:
 First of all, does this look like a reasonable overall structure, or
 are there better alternatives?

You could make a 'bin' directory next to 'myproject' with executable programs
which would usually do something like

#!/usr/bin/env python
from myproject.app1 import main
main.run()

to make a more clear seperation between code that can be executed and code that
is imported in an application.


Also, why do you make a distinction between shared and non-shared code?
You could simply eliminate 'shared' directory, and put its contents directly
under myproject.

 Second (and the thing I'm primarily interested in), what is the best
 way to deal with importing the shared modules in the applications,
 scripts, test programs, and possibly other shared modules? I think the
 most obvious solution is to add /path/to/myproject to PYTHONPATH.
 However, this seems like an annoying little dependency that you are
 likely to forget whenever you move your workspace to a new path, open
 up a branch of the project in a different directory, or download and
 work on the project using a different computer.

What I am missing here is how you plan to do the development.
If you want to do branch-based development, you may want to have a look at
Combinator (at divmod.org). It handles branch management, adds executable
programs from bin to your path (in your current branch), and extends PYTHONPATH
(with your current branch).

Even if you have just 1 branch (namely 'trunk') it may be useful.


 Is there a way to set this up that is a bit more self contained? For
 example, at first I was somewhat hopeful that Python could ascend
 parent directories until it reached a directory that did not include
 an __init__.py file, and it could use this as a root for referring to
 packages and modules from any file contained within. (e.g. in the
 example project above, any file could refer to myproject.shared.mylib1
 so long as 'myproject' and all subdirectories contained an
 __init__.py, and the parent of 'myproject' didn't contain such a
 file). Evidently this is not the case, but it seems like it could be a
 useful feature in these situations.

Work is being done on relative imports. Not sure of its state.

 Anyway, I'm sure this is not an unusual situation, so I'm curious to
 hear how other people have handled it.

Most people probably run scripts from the root, ie where 'myproject' is a
sub-directory. Since Python automatically adds '.' to its path, it will work.

Sincerely,
Albert
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Re: arrays

2008-05-19 Thread Gary Herron


Marlin Rowley wrote:

All:
 
Say I have an array:
 
a = ([''],[''])
 
How do I make it so that I now have:
 
starting with first element (a[0])

new_arr[0] = 'r'
new_arr[1] = 'g'
new_arr[2] = 'b'
new_arr[3] = 'a'
new_arr[4] = 'r'
.
 
continuing through a[1] with the same new_arr

new_arr[N] = 'r'
new_arr[N+1] = 'g'

 
-M



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2 questions:

1.  Why have you flooded this news group with three identical copies of 
a question under three different subject?  This is a (mild) bit of abuse 
of the newsgroup.  One copy with a reasonable subject line is enough.


2.  Haven't I answered this question for you often enough already?   Was 
my answer not clear enough, or has the problem again changed slightly 
enough to require a new answer?   Having solved 3 or 4 versions of this 
problem for you already, I'm wondering why I'm seeing it posed yet one 
more time.   If this is *exactly* the same problem I solved once already 
(and I believe it is), why are we seeing it again, and if it is not the 
*exact* same problem,  why are we seeing so many similar version of 
it?   It's starting to feel like a slight abuse of my time to see this 
problem on the newsgroup again.  



Gary Herron

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Re: explain this function to me, lambda confusion

2008-05-19 Thread Arnaud Delobelle

On May 19, 5:22 am, Terry Reedy [EMAIL PROTECTED] wrote:
 Arnaud Delobelle [EMAIL PROTECTED] wrote in message
[...]
 | Note that the same thing can be said about generator expressions,
 | which are nothing more than anonymous, non-reusable, generator
 | functions.

 Right.  So if someone posted on genexp confusion, I would suggest
 'write a full generator function'.

I was just arguing against arguing for the removal of lambda on the
basis that it doesn't add any functionality to the language!

 | Instead these were _added_ to the language!

 As a convenience.
 Actually, if one uses more that one for-clause in a generator expression,
 there is a potential gotcha in relation to name capture.  So if that bites,
 the genexp is not so much a convenience, and one might better write
 the full function.

 tjr

Yes, IMHO this is a bug, and I wish I had the time to dive into the
code to see if I can fix it.

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Re: python script to windows exe

2008-05-19 Thread [EMAIL PROTECTED]

 but when i run the exe my program in not behaving as
 it supposed to be.its generating some errors.i dont know why this
 thing is happening as when i run my script it works fine.can some one
 put some light here.

There is nothing special in executables produced by py2exe. I mean
that the debugging strategy is as always. A good start might be in
adding logging\tracing facilities both to script and the executable.
Comparing two trace files could give you some clue.
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Re: TPCServer and xdrlib

2008-05-19 Thread Laszlo Nagy




It is possible to change the serialization used by Pyro

  http://pyro.sourceforge.net/manual/9-security.html#pickle

to the the 'gnosis' XML Pickler.
  
As I said earlier, I would not use XML. Just an example - I need to be 
able to transfer image files, word and excel documents. How silly it 
would be to base64encode a binary file, then put it into an XML.


 L

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Re: Reading Java byte[] data stream over standard input

2008-05-19 Thread Marc 'BlackJack' Rintsch

On Mon, 19 May 2008 00:14:25 -0700, sapsi wrote:

 Yes, that could be the case. Browsing through hadoop's source, i see
 stdin in the above code is reading from piped Java DataOutputStream.
 I read of a libray on the net Javadata.py that reads this but it has
 disappeared.
 What is involved in reading from a Dataoutputstream?

According to the Java docs of `DataInput` and `DataOutput` it is quite
simple.  Most methods just seem to write the necessary bytes for the
primitive types except `writeUTF()` which prefixes the string data with
length information.

So if it is not Strings you are writing then hadoop seems to throw in
some information into the stream.

Ciao,
Marc 'BlackJack' Rintsch
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Re: Classmethods are evil


Ivan Illarionov a écrit :
After re-reading Python is not Java I finally came to conclusion that 
classmethods in Python are a very Bad Thing. 


I can't see any use-case of them that couldn't be re-written more clearly 
with methods of metaclass or plain functions.


Plain functions don't give you polymorphic dispatch and can't be 
overriden. Using metaclass methods requires a custom metaclass, which 1/ 
adds boilerplate code and cognitive load and 2/may bring problems, 
specially wrt/ MI.



They have the following issues:
1. You mix instance-level and class-level functionality in one place 
making your code a mess.


May I remind you that every name defined at the top-level of a class 
statement becomes a class attribute ?


Anyway : most of the use case I've had so far for classmethods required 
collaboration between the instance and the class, and I definitively 
prefer to have related functionalities defined in one place.



2. They are slower than metaclass methods or plain functions.


Slower than plain functions, indeed - but so are instancemethods. Slower 
that metaclass methods ? I never benchmarked this, but I don't see any 
reason that should be the case. Anyway, you could also argue that 
properties are slower than plain attributes, which are slower than local 
vars etc...



I really want to hear your opinions on the subject.



Mine is that classmethods are a GoodThing that make simple thing easy.

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Re: python script to windows exe

2008-05-19 Thread Benjamin Kaplan

On Mon, May 19, 2008 at 3:32 AM, sandeep [EMAIL PROTECTED] wrote:

 hi all

 i am very much a newbie to python but has some experience of
 development.i am trying to write a script which will loop through the
 outlook 2003 inbox and save the email data in an simple data.html page
 and save all the attachments in a folder name emails.after some
 initial struggling i am able to write this script.but now i want to
 create the exe file of this script.i have used py2exe for this job and
 created the exe. but when i run the exe my program in not behaving as
 it supposed to be.its generating some errors.i dont know why this
 thing is happening as when i run my script it works fine.can some one
 put some light here. i am using python2.5 and is using
 py2exe-0.6.6.win32-py2.5.exe of py2exe. My os is windows xp with
 service pack2.


 thanks and reagrds
 sandeep kumar sharma
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What exactly are those errors? You can get more help if we know more about
the problem.
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Re: python script to windows exe

2008-05-19 Thread sandeep

On May 19, 1:39 pm, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
  but when i run the exe my program in not behaving as
  it supposed to be.its generating some errors.i dont know why this
  thing is happening as when i run my script it works fine.can some one
  put some light here.

 There is nothing special in executables produced by py2exe. I mean
 that the debugging strategy is as always. A good start might be in
 adding logging\tracing facilities both to script and the executable.
 Comparing two trace files could give you some clue.

hi here is my code.i wont get any errors when i run this script.it may
not be the best pycode as i am very much new to python development.

import win32com,win32com.client
import os,os.path
import codecs
import zipfile

[EMAIL PROTECTED]:::Sandeep Kumar Sharma

#outlook2003 application refrence
outlook_app=0
#outlook ids to access different folders look into msdn for more info.
not a preffered way as i am hardcoding data here
OlDefaultFolders={'olFolderCalendar':9,'olFolderConflicts':
19,'olFolderContacts':10,'olFolderDeletedItems':3,'olFolderDrafts':
16,'olFolderInbox':6,'olFolderJournal':11,'olFolderJunk':
23,'olFolderLocalFailures':21,'olFolderNotes':12,'olFolderOutbox':
4,'olFolderSentMail':5,'olFolderServerFailures':
22,'olFolderSyncIssues':20,'olFolderTasks':
13,'olPublicFoldersAllPublicFolders':18}
#outlook types to save mailItem look into msdn for more info
#although doesnot work for me :-(
OlSaveAsType={'olTXT': 0,'olRTF':1,'olTemplate': 2,'olMSG': 3,'olDoc':
4,'olHTML':5,'olVCard': 6,'olVCal':7,'olICal': 8};

#refrence to content in inbox
inbox_obj=0

#function which will initialise outlook and return its reference
def getAppRef():
temp=win32com.client.Dispatch(OutLook.Application)
return temp.GetNamespace(MAPI)

#function to return the folders in the outlook
def getOutLookFolders(a,b=OlDefaultFolders['olFolderInbox']):
return a.GetDefaultFolder(b)

#function to get email content
def getMailContent(obj):
txt_file=codecs.open('data.html',encoding='utf-8',mode='w')
for kk in range(len(obj.Items),1,-1):
#for kk in range(len(obj.Items-1),0,-1):
#print 'hello'
print 'writting file='+str(kk)
mailItem=obj.Items[kk]
writeData(mailItem,txt_file)

#print mailItem.OlSaveAsType.olMSG
#saveCopy(mailItem)
#print sender=+mailItem.SenderName+'
SenderEmailId='+str(mailItem.SenderEmailAddress)+'
Time='+str(mailItem.ReceivedTime)
#print 'Subject='+mailItem.Subject+' size='+str(mailItem.Size)

txt_file.close()
'''
file_zip=zipfile.ZipFile(txt_file,w,zipfile.ZIP_DEFLATED)
file_zip.write('data.log')
file_zip.close()
'''

#function to create a directory
#obviously not a best way :-( but i think can expected this sort of
mistakes from beginners
def createDir():
path=os.path.abspath(\email)
if(os.path.exists(path)):
print Directory already exists
else:
os.system(md +path)

#function to save a copy of email
def writeData(mailItem,file):
data=p
sender='h4SenderName/
h4'+checkStringType(mailItem.SenderName)
time='brh4Time/
h4'+checkStringType(str(mailItem.ReceivedTime))
attachment='brh5Attachments Count/
h5'+str(len(mailItem.Attachments))
edata='h4Email Content/h4'+checkStringType(mailItem.Body)+/
phr/
dataToWrite=data+sender+time+attachment+edata
getAttachmentInfo(mailItem.Attachments)
file.write(getHTMLString(dataToWrite))
#checkStringType(dataToWrite)

def getAttachmentInfo(atmts):
for kk in range(1,len(atmts)):
atmt=atmts[kk]
#print File Name=+atmt.FileName+'
DisplayName='+atmt.DisplayName+' PathName='+atmt.PathName+' '
abc=os.path.isdir(os.getcwd()+'\email')

if(abc==True):
print 'directory exists'

else:
os.mkdir(os.getcwd()+'\email')

path=os.path.abspath(os.getcwd()+'\email')
atmt.SaveAsFile(path+\\+atmt.DisplayName)



# function to check whether the character encoding is ascii or smthing
else
def checkStringType(a):

if isinstance(a,str):
   b='not a unicode string'

else:
a.encode('utf-8')
#print 'unicode type'

return a

#function to save the coopy of an email
#:-( but smhow it generate error whenever i make a call to it
def saveCopy(mailItem):

name=\\+mailItem.Subject+__+str(mailItem.ReceivedTime)
print name
#global outlook_app
try:
mailItem.SaveAs(path+name+.txt,OlSaveAsType['olTXT'])
except BaseException:
print BaseException

def getHTMLString(b):
a='htmlheadtitleYour Email Data log is here/title/
headbody'+b+'/body/html'
return a

#main entrance to the program
def main():
global outlook_app,inbox_obj
outlook_app=getAppRef()
#print outlook_app.OlSaveAsType.olMSG
print '=='
print dir(outlook_app)
print '=='
inbox_obj=getOutLookFolders(outlook_app)
print dir(inbox_obj)
print

ANN: eric 4.1.4 released

2008-05-19 Thread Detlev Offenbach

Hi,

this is to inform all of you about the immediate availability of eric
4.1.4. It includes a fix for an API change of Qt 4.4, that caused eric4
to crash. Please update immediately.

As usual, it is available via
http://www.die-offenbachs.de/eric/index.html.

What is eric?
-
Eric is a Python (and Ruby) IDE, that comes with all batteries included.
For more details please see the above link.

Regards,
Detlev
-- 
Detlev Offenbach
[EMAIL PROTECTED]
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Re: Using Python for programming algorithms


Henrique Dante de Almeida a écrit :

On May 17, 7:32 pm, Vicent Giner [EMAIL PROTECTED] wrote:

Hello.


(snip)

However, it is usually said that Python is not a compiled but
interpreted programming language —I mean, it is not like C, in that
sense.


(snip)
 I guess that python is not a good language for that. 

(snip)
 My opinion: choose compiled or byte compiled languages. 


Slightly OT (ie : not talking about computation-heavy alorgithm being 
better implemented in C then wrapped in Python - this seems quite 
obvious) but just a couple facts:


1/ being interpreted or compiled (for whatever definition of these 
terms) is not a property of a language, but a property of an 
implementation of a language.


2/ actually, all known Python implementations compile to byte-code.

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Disabling raw string to print newlines

2008-05-19 Thread kuratkull

Hello,

***
import urllib2
import re
import string
import sys

url = http://www.macgyver.com/;
request = urllib2.Request(url)
opener = urllib2.build_opener()
html = opener.open(request).read()

match = re.compile(PRE(.+)/PRE, re.DOTALL)

out = match.findall(html)

print out
**

I would like to print out string with formatting, but as I read, the
string is made into a raw string when using re.
How could I disable or bypass this?

I googled for an hour and couldn't find a solution.

Thank you in advance.


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Re: Showing the method's class in expection's traceback

2008-05-19 Thread Gabriel Genellina

En Sun, 18 May 2008 17:31:44 -0300, Diez B. Roggisch [EMAIL PROTECTED] 
escribió:
 Agustin Villena schrieb:

 is there anyway to show the class of a method in an exception's
 traceback?

 I want to improve the line
 File G:\dev\exceptions\sample.py, line 3, in foo

 to
 File G:\dev\exceptions\sample.py, line 3, in Some.foo

 Is this improvement feasible

 It should be. You can get a dictionary of the locals of an exception
 stack frame, of which you could extract the self-parameter's class.

That by itself is not enough, the method could be inherited; one should walk 
the base classes in the MRO to find the right one. And deal with classmethods 
and staticmethods. And decorators that don't preserve meta information... Hmmm, 
I think it isn't so trivial as it seems.

-- 
Gabriel Genellina

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Re: python script to windows exe

2008-05-19 Thread sandeep


hi
the py code that i have written is here.when i run this code i wont
get any errors it just works fine for me.but when i created the exe i
start getting an error in my 'getMailContent' function. The error
description is

TypeError:unsupported operand type(s) for :- 'instance' and 'int'

i dont know why i am start getting this error when i run it through
the exe.


import win32com,win32com.client
import os,os.path
import codecs
import zipfile

[EMAIL PROTECTED]:::Sandeep Kumar Sharma

#outlook application refrence
outlook_app=0
#outlook ids to access different folders look into msdn for more info.
not a preffered way as i am hardcoding data here
OlDefaultFolders={'olFolderCalendar':9,'olFolderConflicts':
19,'olFolderContacts':10,'olFolderDeletedItems':3,'olFolderDrafts':
16,'olFolderInbox':6,'olFolderJournal':11,'olFolderJunk':
23,'olFolderLocalFailures':21,'olFolderNotes':12,'olFolderOutbox':
4,'olFolderSentMail':5,'olFolderServerFailures':
22,'olFolderSyncIssues':20,'olFolderTasks':
13,'olPublicFoldersAllPublicFolders':18}
#outlook types to save mailItem look into msdn for more info
#although doesnot work for me :-(
OlSaveAsType={'olTXT': 0,'olRTF':1,'olTemplate': 2,'olMSG': 3,'olDoc':
4,'olHTML':5,'olVCard': 6,'olVCal':7,'olICal': 8};

#refrence to content in inbox
inbox_obj=0

#function which will initialise outlook and return its reference
def getAppRef():
temp=win32com.client.Dispatch(OutLook.Application)
return temp.GetNamespace(MAPI)

#function to return the folders in the outlook
def getOutLookFolders(a,b=OlDefaultFolders['olFolderInbox']):
return a.GetDefaultFolder(b)

#function to get email content
def getMailContent(obj):
txt_file=codecs.open('data.html',encoding='utf-8',mode='w')
for kk in range(len(obj.Items),1,-1):
#for kk in range(len(obj.Items-1),0,-1):
#print 'hello'
print 'writting file='+str(kk)
mailItem=obj.Items[kk]
writeData(mailItem,txt_file)

#print mailItem.OlSaveAsType.olMSG
#saveCopy(mailItem)
#print sender=+mailItem.SenderName+'
SenderEmailId='+str(mailItem.SenderEmailAddress)+'
Time='+str(mailItem.ReceivedTime)
#print 'Subject='+mailItem.Subject+' size='+str(mailItem.Size)

txt_file.close()
'''
file_zip=zipfile.ZipFile(txt_file,w,zipfile.ZIP_DEFLATED)
file_zip.write('data.log')
file_zip.close()
'''

#function to create a directory
#obviously not a best way :-( but i think can expected this sort of
mistakes from beginners
def createDir():
path=os.path.abspath(\email)
if(os.path.exists(path)):
print Directory already exists
else:
os.system(md +path)

#function to save a copy of email
def writeData(mailItem,file):
data=p
sender='h4SenderName/
h4'+checkStringType(mailItem.SenderName)
time='brh4Time/
h4'+checkStringType(str(mailItem.ReceivedTime))
attachment='brh5Attachments Count/
h5'+str(len(mailItem.Attachments))
edata='h4Email Content/h4'+checkStringType(mailItem.Body)+/
phr/
dataToWrite=data+sender+time+attachment+edata
getAttachmentInfo(mailItem.Attachments)
file.write(getHTMLString(dataToWrite))
#checkStringType(dataToWrite)

def getAttachmentInfo(atmts):
for kk in range(1,len(atmts)):
atmt=atmts[kk]
#print File Name=+atmt.FileName+'
DisplayName='+atmt.DisplayName+' PathName='+atmt.PathName+' '
abc=os.path.isdir(os.getcwd()+'\email')

if(abc==True):
print 'directory exists'

else:
os.mkdir(os.getcwd()+'\email')

path=os.path.abspath(os.getcwd()+'\email')
atmt.SaveAsFile(path+\\+atmt.DisplayName)



# function to check whether the character encoding is ascii or smthing
else
def checkStringType(a):

if isinstance(a,str):
   b='not a unicode string'

else:
a.encode('utf-8')
#print 'unicode type'

return a

#function to save the coopy of an email
#:-( but smhow it generate error whenever i make a call to it
def saveCopy(mailItem):

name=\\+mailItem.Subject+__+str(mailItem.ReceivedTime)
print name
#global outlook_app
try:
mailItem.SaveAs(path+name+.txt,OlSaveAsType['olTXT'])
except BaseException:
print BaseException

def getHTMLString(b):
a='htmlheadtitleYour Email Data log is here/title/
headbody'+b+'/body/html'
return a

#main entrance to the program
def main():
global outlook_app,inbox_obj
outlook_app=getAppRef()
#print outlook_app.OlSaveAsType.olMSG
print '=='
print dir(outlook_app)
print '=='
inbox_obj=getOutLookFolders(outlook_app)
print dir(inbox_obj)
print (inbox_obj.Items)
#saveCopy(inbox_obj.Items[1])
getMailContent(inbox_obj)



main()


my setup file has this code

from distutils.core import setup
import py2exe

setup(console=['outlook.py'])


i have just copied and pasted it from the tutorial available at the
py2exe site and changed the filename with mine

Re: Disabling raw string to print newlines

[EMAIL PROTECTED] wrote:

 Hello,
 
 ***
 import urllib2
 import re
 import string
 import sys
 
 url = http://www.macgyver.com/;
 request = urllib2.Request(url)
 opener = urllib2.build_opener()
 html = opener.open(request).read()
 
 match = re.compile(PRE(.+)/PRE, re.DOTALL)
 
 out = match.findall(html)
 
 print out
 **
 
 I would like to print out string with formatting, but as I read, the
 string is made into a raw string when using re.
 How could I disable or bypass this?

You have a misconception here. A raw-string in python is *only* different as
literal - that is, you can write

rfooo\bar

where you'd have to write

fooo\\bar

with normal string-literals. However, the result of both is a byte-string
object that is exactly equal. So whatever out contains, it has nothing to
do with raw-string or not.

But what you probably mean is that putting out a list using print will use
the repr()-call on the contained objects. So instead of doing

print out

do 

print \n.join(out)

or such.

Diez
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Re: Using Python for programming algorithms


Vicent Giner a écrit :

Hello.

I am new to Python. It seems a very interesting language to me. Its
simplicity is very attractive.

However, it is usually said that Python is not a compiled but
interpreted programming language


cf my answer to you and Henrique on this.



I am working on my PhD Thesis, which is about Operations Research,
heuristic algorithms, etc., and I am considering the possibility of
programming all my algorithms in Python.

The usual alternative is C,  but I like Python more.


Then use it.


The main drawbacks I see to using Python are these:

* As far as I understand, the fact that Python is not a compiled
language makes it slower than C, when performing huge amounts of
computations within an algorithm or program.


In which way is this a problem here ? I thought your thesis was about 
algorithm, not about implementation optimisation ? And if it's the 
later, then even C might sometimes be too high level - you should drop 
to assembly language.



* I don't know how likely it is to find libraries in Python related to
my research field.


I can't tell but you'd be surprised by the quantity of available Python 
libs.



* I know Python is a serious and mature programming language, of
course. But I do not know if it is seen as just funny in a research
context. Is Python considered as a good programming language for
implementing Operations Research algorithms, such as heuristics and
other soft-computing algorithms?


Don't know if this answers your question, but it seems that at least 
some authors consider it a good choice:

http://www.oreilly.com/catalog/9780596529321/

All code examples in this books are in Python - very badly written 
Python, alas...



Maybe this is not the right forum, but maybe you can give me some
hints or tips...


Hem... Obviously, most people here will have a little biased, you know ?-)

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Re: Using Python for programming algorithms

2008-05-19 Thread Tim Golden


Bruno Desthuilliers wrote:

2/ actually, all known Python implementations compile to byte-code.


In curiosity, did your actually mean, in the French sense, at the moment 
or, in the English sense, in contrast to something stated earlier? Or maybe both?


TJG
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Re: How do you use Python in non-GUI work?


John Salerno a écrit :

Hey all. Just thought I'd ask a general question for my own interest.
Every time I think of something I might do in Python, it usually
involves creating a GUI interface, so I was wondering what kind of
work you all do with Python that does *not* involve any GUI work.
This could be any little scripts you write for your own benefit, or
what you do at work, if you feel like talking about that! :)


web apps, command line utilities, and of course libraries.

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Re: explain this function to me, lambda confusion


inhahe a écrit :

Both the responses offer lambda free alternatives. That's fine, and
given the terse documentation and problems that I had understanding
them, I would agree. So what applications are lambdas suited to? I
think the parameterised function model is one.
What else?


i've hardly ever used lambdas since map() and filter() were replaced by list 
comprehension.  two other uses I can think of for it are: using it as a 
sorting key (which takes a function and lambdas are perfect for that when a 
direct function isn't available. for example, lambda x: x.myName),


import operator
foos.sort(key=operator.attrgetter('myName'))


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Re: Showing the method's class in expection's traceback

 
 That by itself is not enough, the method could be inherited; one should
 walk the base classes in the MRO to find the right one. And deal with
 classmethods and staticmethods. And decorators that don't preserve meta
 information... Hmmm, I think it isn't so trivial as it seems.

You might even have an instance-unique method. But I think the OP is
satisfied with a 90%-solution.

Diez
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pickle internals

2008-05-19 Thread Rustom Mody

I am trying to understand pickle internals.
This involves:
-- the algorithm(s) used for traversal arbitrary structures
-- the pickle format
-- the use if any of introspection

I'll be thankful for any pointers

PS Should this question be put on some other list?/
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Re: Get all the instances of one class

2008-05-19 Thread Nick Craig-Wood

Matt Nordhoff [EMAIL PROTECTED] wrote:
  Tommy Nordgren wrote:
  class MyClass : a_base_class
memberlist=[]
  
  #  Insert object in memberlist when created;
  #  note: objects won't be garbage collected until removed from memberlist.
 
  Just to say, if you wanted to go about it that way, you could avoid the
  garbage collection problem by using weakrefs:
 
 http://docs.python.org/lib/module-weakref.html

Eg...

from weakref import WeakKeyDictionary

class Test(object):
_instances = WeakKeyDictionary()
def __init__(self):
self._instances[self] = True
# your normal init stuff here
@classmethod
def instances(cls):
return cls._instances.keys()

print Test.instances()
a = Test()
b = Test()
print Test.instances()
del a
print Test.instances()
del b
print Test.instances()



Which prints

[]
[__main__.Test object at 0xb7d4eb6c, __main__.Test object at 0xb7d4eb4c]
[__main__.Test object at 0xb7d4eb6c]
[]


-- 
Nick Craig-Wood [EMAIL PROTECTED] -- http://www.craig-wood.com/nick
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Re: Using Python for programming algorithms


Tim Golden a écrit :

Bruno Desthuilliers wrote:

2/ actually, all known Python implementations compile to byte-code.


In curiosity, did your actually mean, in the French sense, at the 
moment or, in the English sense, in contrast to something stated 
earlier? Or maybe both?


I mainly intented it to be understood in the English sense - but taking 
it the French way would be ok too.

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Re: Reading Java byte[] data stream over standard input

2008-05-19 Thread Giles Brown

On 19 May, 06:11, sapsi [EMAIL PROTECTED] wrote:
 Hello,
 I am using HadoopStreaming using a BinaryInputStream. What this
 basically does is send a stream of bytes (  the java type is : private
 byte[] bytes) to my python program.

 I have done a test like this,
 while 1:
 x=sys.stdin.read(100)
 if x:
 print x
 else:
 break

 Now, the incoming data is binary(though mine is actually merely ascii
 text) but the output is not what is expected. I expect for e.g

 all/86000/114.310.151.209.60370-121.110.5.176.113\n62485.9718
 118.010.241.12 60370 128.210.5.176

 However i get a 1 before all and a 4 just after \n and before the 6.

 My question is : how do i read binary data(Java's byte stream) from
 stdin?
 Or is this actually what i'm getting?

 Thanks
 Sapsi

In the past I've sent binary data to a java applet reading
DataInputStream using xdrlib from the standard library.  I'd expect
that it would work in the reverse direction so I suggest you have a
look at that.

Giles
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Re: Organizing a Python project

2008-05-19 Thread Jorge Godoy

A.T.Hofkamp wrote:

 Also, why do you make a distinction between shared and non-shared code?
 You could simply eliminate 'shared' directory, and put its contents
 directly under myproject.

I would go further and make them individual projects, with their own version
control, code repository and then install them as eggs using setuptools.

This has been working fine for me in some projects and has the advantage of
being reusable in different big projects.

Also, using setuptools on each big project I don't have to worry with
dependencies because it downloads and installs everything to me when I
install the main project.

 Is there a way to set this up that is a bit more self contained? For
 example, at first I was somewhat hopeful that Python could ascend
 parent directories until it reached a directory that did not include
 an __init__.py file, and it could use this as a root for referring to
 packages and modules from any file contained within. (e.g. in the
 example project above, any file could refer to myproject.shared.mylib1
 so long as 'myproject' and all subdirectories contained an
 __init__.py, and the parent of 'myproject' didn't contain such a
 file). Evidently this is not the case, but it seems like it could be a
 useful feature in these situations.

Eggs would solve that as well.  They would behave like any other
installed library on your system.

-- 
Jorge Godoy  [EMAIL PROTECTED]

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ftplib returns EOFError

2008-05-19 Thread Jon Bowlas

Hi All,

I've written a little method to connect to an ftpserver which works well,
however when I send a file using this ftp connection oddly I _sometimes_ get
returned an EOFError from ftplib.getline even though my file is actually
transferred. 

Here's my script:

def uploadViaFtp(self, file, filename):
'''A method to upload a file via ftp'''
ftpserverloc = self.getItunesUftpServer()
ftpserverusername = self.getItunesUftpUser()
ftpserverpassword = self.getItunesUftpPsswd()
ftp = ftplib.FTP(ftpserverloc)
ftp.login(ftpserverusername, ftpserverpassword)
try:
ftp.storbinary(STOR  + filename, file, 1024)
finally:
file.close()
ftp.quit()


And here's the traceback:
Traceback (innermost last):
  Module ZPublisher.Publish, line 114, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 40, in call_object
  Module Products.FileSystemSite.FSPythonScript, line 108, in __call__
  Module Shared.DC.Scripts.Bindings, line 311, in __call__
  Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
  Module Products.FileSystemSite.FSPythonScript, line 164, in _exec
  Module None, line 28, in upload_submit
   - FSPythonScript at
/silva/service_views/UCLItunesUPodcast/edit/Asset/UCLItunesUTrack/upload_sub
mit
   - Line 28
  Module Products.UCLItunesUPodcast.UCLItunesUService, line 138, in
uploadViaFtp
  Module ftplib, line 523, in quit
  Module ftplib, line 246, in voidcmd
  Module ftplib, line 221, in voidresp
  Module ftplib, line 207, in getresp
  Module ftplib, line 193, in getmultiline
  Module ftplib, line 183, in getline
EOFError


Any help in catching and ignoring this error would be greatly appreciated.

Regards

Jon

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Re: indexed properties...

2008-05-19 Thread David C. Ullrich

On Sun, 18 May 2008 18:18:34 +0200, pataphor [EMAIL PROTECTED]
wrote:

In article [EMAIL PROTECTED], 
[EMAIL PROTECTED] says...

 Is there some reason that would be better? It would make a lot
 of the code more complicated. Ok, it would require only one
 bit of added code, I suppose, but I don't see the plus side.

The plus side is you give up an untenable position :-) 

Maybe you could be more specific? Various positions I've
taken in all this may well be untenable, but I can't think
of any that have anything to do with whether the data should
be a single list instead of a list of lists.

(The only way I can parse this to make it relevant is to
assume that the position you're referring to is that a
list of lists is better than a single list. If so: First, I
haven't said that it was. Second, saying B is untenable
is not much of an answer when someone asks why you
say A is better than B.)

And to address an 
item in a matrix costs two lookups, row and column, while an array needs 
only one. 

The phrase premature optimization springs to mind.

This is _Python_ we're talking about. Supposing you're right that
doing two lookups _in Python_ is faster than doing one lookup
plus the calculuation col + row*width _in Python_, it can't
make enough difference to matter. In the sort of application I
have in mind things already happen instantaneously.

The point is not to improve on NumPy. Trying to improve on
NumPy in pure Python code would be silly - if I wanted
optimized large matrices I'd _use_ NumPy. The point is just
to give a simple intuitive way to manipulate rows and
columns in small matrices. 

So I'm not looking ahead to the future, things are not
scalable? The thing is not _supposed_ to scale up to
large matricies. If a person were dealing with large
matricies then almost all of it would need to be
rewritten (and if a person were dealing with really
large matrices then trying to do the thing in pure
Python would be silly in the first place, and insisting
on being able to write things like m.row[0] =
m.row[1] + m.row[2] could very well be a totally
wrong approach to begin with - I'd figure out the
operations I expected to need to do and write functions
to do them.)

Really. In one of the intended applications the matrix
entries are going to be home-made Rationals. Just
adding two of those guys takes a long time. It's
still more than fast enough for the intended application,
but [oh, never mind.

Sorry about the argumentative tone - I _would_ like
to know which untenable position you're referring to...

P.

David C. Ullrich
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Re: New to Python, Discussion Groups.

2008-05-19 Thread Fuzzyman

On May 19, 1:34 am, cmoller [EMAIL PROTECTED] wrote:
 Hi,

 I am new to Python and the use of discussion groups. Is there a FAQ
 for basic information so certain questions are not repeated?

 I am NOT an experienced programmer, but have decided to write a data
 logger for sensors sending data via an internal ethernet work to
 machines running OS X (Intel). The program should store data and allow
 real time plotting. It does not need a beautiful GUI, but I may want
 to share the program with others, so it should be somewhat intuitive.
 It looks like I could use Python to access MS Excel, which would
 significantly reduce the effort, but I am not sure if this is
 practical. I am not in a hurry and would approach the problem as a way
 to learn.



You could also use Resolver One, a spreadsheet program that lets you
put Python code inside your spreadsheets (effectively providing a
'spreadsheet-like' front end to the code you write).

http://www.resolversystems.com/
http://www.resolverhacks.net/


All the best,

Michael Foord
http://www.ironpythoninaction.com/


 The data I am processing is readily seen via telnet so I know it's
 there.

 Is Python a good choice or should I invest in learning a language well
 known to be best for applications like this? Are there other key
 topics in addition to network programing that I should be focusing on?

 Thanks,

 Chris

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Re: indexed properties...

2008-05-19 Thread pataphor

On Mon, 19 May 2008 06:29:18 -0500
David C. Ullrich [EMAIL PROTECTED] wrote:

 Maybe you could be more specific? Various positions I've
 taken in all this may well be untenable, but I can't think
 of any that have anything to do with whether the data should
 be a single list instead of a list of lists.

What's 'untenable' (hey, I tried to get away with a smiley, remember)
is that a matrix is a list of rows. Suppose you do the transpose trick
with the zip(*M) routine, now it's a list of columns. Both views are
equal, there is no getting around the fact that you're holding an
unnatural predisposition towards seeing the matrix as a list of rows,
which it is most definitely not ...

I was holding the brakes for this argument because I realize it's
intuitive and also because Gabriel seems to want a list stay a list if
he assigns something a list. But that's untenable too. Suppose you
assign a column to a list? The list is torn to shreds and placed over
multiple rows.

 (The only way I can parse this to make it relevant is to
 assume that the position you're referring to is that a
 list of lists is better than a single list. If so: First, I
 haven't said that it was. Second, saying B is untenable
 is not much of an answer when someone asks why you
 say A is better than B.)

Yes, it was not much of an answer but I was afraid of ending up in
this quagmire. I now see that it is unavoidable anyway if I want to
explain myself. Why couldn't you just see it the same way as me and
leave it at that without waking up all the creatures of hell :-)

 And to address an 
 item in a matrix costs two lookups, row and column, while an array
 needs only one. 
 
 The phrase premature optimization springs to mind.

Well, I really liked your  slicing idea ...

 This is _Python_ we're talking about. Supposing you're right that
 doing two lookups _in Python_ is faster than doing one lookup
 plus the calculuation col + row*width _in Python_, it can't
 make enough difference to matter. In the sort of application I
 have in mind things already happen instantaneously.

The computation is almost certainly faster. Lookups are expensive.
However I concede the point because we're not supposed to worry about
such stuff. But it *is* a simpler format.

 The point is not to improve on NumPy. Trying to improve on
 NumPy in pure Python code would be silly - if I wanted
 optimized large matrices I'd _use_ NumPy. The point is just
 to give a simple intuitive way to manipulate rows and
 columns in small matrices. 

Yes, me too. This is all about intuition.

 So I'm not looking ahead to the future, things are not
 scalable? The thing is not _supposed_ to scale up to
 large matricies. If a person were dealing with large
 matricies then almost all of it would need to be
 rewritten (and if a person were dealing with really
 large matrices then trying to do the thing in pure
 Python would be silly in the first place, and insisting
 on being able to write things like m.row[0] =
 m.row[1] + m.row[2] could very well be a totally
 wrong approach to begin with - I'd figure out the
 operations I expected to need to do and write functions
 to do them.)

The reason why I am interested in this is that since I was writing
sudoku algorithms some time ago I have been looking for ways to interact
with data according to different views. I want the data to update even
when I have made changes to them according to another view. In my case
things are even more complex than they are with matrices because I
tend to view sudoku as subcases of binary cubes. Imagine a 3d 9*9*9
chessboard and try to place 81 non-threatening rooks in it. This is not
quite a solution to a sudoku but every sudoku is also a solution to this
problem. 

One of the solution strategies I thought of was forgetting about the 3d
binary cube's content at all, and just update row, column and file
totals (I start with a 'filled' cube and wipe away fields that are
covered by the 'rooks') to drive the optimization. Somehow this seems
possible even though I do not use the cube itself anymore. It just
exists as a figment of my imagination but still it defines the context.

I hope you understand how this was driving me crazy and why I would be
more than happy to return to a safe and sound, actually 'existing' cube,
if only there was a way to access rows, columns and files (for example
sum their elements) as shared data. In the end I realized that
everything I was doing was an abstraction anyway and if that is the
case why not use the simplest possible representation for the data and
let any matrices, rows, columns, files, cubes and so on exist somewhere
higher up in the levels of abstraction of the code.

 Really. In one of the intended applications the matrix
 entries are going to be home-made Rationals. Just
 adding two of those guys takes a long time. It's
 still more than fast enough for the intended application,
 but [oh, never mind.

Too late :-)

 Sorry about the argumentative tone - I _would_ like
 to

Re: python script to windows exe

2008-05-19 Thread Fuzzyman

On May 19, 8:32 am, sandeep [EMAIL PROTECTED] wrote:
 hi all

 i am very much a newbie to python but has some experience of
 development.i am trying to write a script which will loop through the
 outlook 2003 inbox and save the email data in an simple data.html page
 and save all the attachments in a folder name emails.after some
 initial struggling i am able to write this script.but now i want to
 create the exe file of this script.i have used py2exe for this job and
 created the exe. but when i run the exe my program in not behaving as
 it supposed to be.its generating some errors.i dont know why this
 thing is happening as when i run my script it works fine.can some one
 put some light here. i am using python2.5 and is using
 py2exe-0.6.6.win32-py2.5.exe of py2exe. My os is windows xp with
 service pack2.

 thanks and reagrds
 sandeep kumar sharma


You'll need to post the actual errors you get for people to be able to
help. You might find posting to the py2exe mailing list useful.

All the best,


Michael Foord
http://www.ironpythoninaction.com/
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Re: How do you use Python in non-GUI work?

2008-05-19 Thread janislaw

On May 19, 12:20 am, John Salerno [EMAIL PROTECTED] wrote:
 Hey all. Just thought I'd ask a general question for my own interest. Every 
 time I think of something I might do in Python, it usually involves creating 
 a GUI interface, so I was wondering what kind of work you all do with Python 
 that does *not* involve any GUI work. This could be any little scripts you 
 write for your own benefit, or what you do at work, if you feel like talking 
 about that! :)

 Thanks.

- Programs creating C and VHDL source files
- Scipy scripts generating charts

Jan Wicijowski
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Re: Disabling raw string to print newlines

On May 19, 4:54 am, [EMAIL PROTECTED] wrote:
 Hello,

 ***
 import urllib2
 import re
 import string
 import sys

 url = http://www.macgyver.com/;
 request = urllib2.Request(url)
 opener = urllib2.build_opener()
 html = opener.open(request).read()

 match = re.compile(PRE(.+)/PRE, re.DOTALL)

 out = match.findall(html)

 print out
 **

 I would like to print out string with formatting, but as I read, the
 string is made into a raw string when using re.
 How could I disable or bypass this?

 I googled for an hour and couldn't find a solution.

 Thank you in advance.

Change your print statement to:

print out[0]

-- Paul
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Re: explain this function to me, lambda confusion

2008-05-19 Thread Terry Reedy


Arnaud Delobelle [EMAIL PROTECTED] wrote in message 
news:[EMAIL PROTECTED]
| On May 19, 5:22 am, Terry Reedy [EMAIL PROTECTED] wrote:
|  Arnaud Delobelle [EMAIL PROTECTED] wrote in message
| [...]
|  | Note that the same thing can be said about generator expressions,
|  | which are nothing more than anonymous, non-reusable, generator
|  | functions.
| 
|  Right.  So if someone posted on genexp confusion, I would suggest
|  'write a full generator function'.
|
| I was just arguing against arguing for the removal of lambda on the
| basis that it doesn't add any functionality to the language!

I sort of understood that ;-)
Like Guido, I am split on keep/remove.
However, I have decided to leave lambda out of my Python-subset 
executable-pseudocode algorithm language.  I have not decided whether or 
not to include genexps.

|  | Instead these were _added_ to the language!
| 
|  As a convenience.
|  Actually, if one uses more that one for-clause in a generator 
expression,
|  there is a potential gotcha in relation to name capture.  So if that 
bites,
|  the genexp is not so much a convenience, and one might better write
|  the full function.

| Yes, IMHO this is a bug, and I wish I had the time to dive into the
| code to see if I can fix it.

If I do include them, I might restrict them to one for-clause because of 
that glitch, whose details I keep forgetting.

tjr
| 



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Re: Disabling raw string to print newlines

On May 19, 4:54 am, [EMAIL PROTECTED] wrote:
 Hello,

snip code example scraping a QOTD from www.mcgyver.com

 print out
 **

Since you have no control over spacing and line breaks in the input,
you can reformat using the textwrap module.  First replace all \ns
with  , then use re.sub to replace multiple spaces with a single
space, then call textwrap.fill to reformat the line into lines up to
'n' characters long (I chose 50 in the sample below, but you can
choose any line length you like).

out = match.findall(html)
out = out[0].replace(\n, )
out = re.sub(\s+, ,out)

print textwrap.fill(out,50)


-- Paul
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Re: Disabling raw string to print newlines

On May 19, 8:09 am, Paul McGuire [EMAIL PROTECTED] wrote:
 On May 19, 4:54 am, [EMAIL PROTECTED] wrote: Hello,

 snip code example scraping a QOTD fromwww.mcgyver.com



  print out
  **

 Since you have no control over spacing and line breaks in the input,
 you can reformat using the textwrap module.  First replace all \ns
 with  , then use re.sub to replace multiple spaces with a single
 space, then call textwrap.fill to reformat the line into lines up to
 'n' characters long (I chose 50 in the sample below, but you can
 choose any line length you like).

 out = match.findall(html)
 out = out[0].replace(\n, )
 out = re.sub(\s+, ,out)

 print textwrap.fill(out,50)

 -- Paul

One last try - .replace(\n, ) is unnecessary, textwrap.fill takes
care of removing extra newlines already.

out = match.findall(html)
out = out[0]
out = re.sub(\s+, ,out)

print textwrap.fill(out,50)

-- Paul
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Re: python script to windows exe

2008-05-19 Thread Gabriel Genellina

En Mon, 19 May 2008 06:59:22 -0300, sandeep [EMAIL PROTECTED] escribió:

 the py code that i have written is here.when i run this code i wont
 get any errors it just works fine for me.but when i created the exe i
 start getting an error in my 'getMailContent' function. The error
 description is

 TypeError:unsupported operand type(s) for :- 'instance' and 'int'

 i dont know why i am start getting this error when i run it through
 the exe.

By example, your code uses os.getcwd() - so it depends on the current dir. Try 
running it from a different directory. Don't focus too much on the .exe vs 
.py difference: it might not be relevant, the error may reside elsewhere.

Please post the complete exception message *and* traceback. Don't retype it; 
copy and paste the message from the console. Your message above doesn't appear 
to be correctly typed, it says `:-` but Python would print `-:` and I don't see 
any `-` operation in your code that could fail in that way.

Also, don't do this:

 try:
 mailItem.SaveAs(path+name+.txt,OlSaveAsType['olTXT'])
 except BaseException:
 print BaseException

because you're completely hiding important information about *what* happened.

-- 
Gabriel Genellina

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Re: Reading Java byte[] data stream over standard input

2008-05-19 Thread John Machin


sapsi wrote:

I should also mention that for some reason there are several binay
values popping in between for some reason. This behavior (for the
inputr stream) is not expected



Now, the incoming data is binary(though mine is actually merely ascii
text) but the output is not what is expected. I expect for e.g

all/86000/114.310.151.209.60370-121.110.5.176.113\n62485.9718
118.010.241.12 60370 128.210.5.176

However i get a 1 before all and a 4 just after \n and before the 6.

My question is : how do i read binary data(Java's byte stream) from
stdin?
Or is this actually what i'm getting?



Consider changing print x to print repr(x) ... this would mean that 
you have a better chance of understanding what the extra or unexpected 
popping-in bytes are.

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Re: TPCServer and xdrlib

2008-05-19 Thread Laszlo Nagy




I'm trying to write a multi threaded TPC server. I have used xmlrpc



 How exactly did you come to the conclusion that your server must be
multi threaded ?
  

I don't think that it is important. But if you are interested:

- yes, the server will probably be I/O bound, not CPU bound
- I'm have experience with thread programming, but not with twisted


- I have to send larger amounts of data, the overhead of converting to
XML and parsing XML back would be too much pain



 - What's the expected amount of data you have to transfer ?
  
I cannot predict. But I will be trasferring image files which would be 
silly to do with XML.

 - What's the expected network bandwidth ?
  

It cannot be determined in advance.

 - What's the expected acceptable transfer time ?
  

Not known.

 - How many users are expected to be transfering data at the same time ?
  
The server should be scaleable up to hundreds of users. (I'm just trying 
to answer your questions, if that helps to answer mine.)

 Did you consider gzipping your XML (or YAML) packets ? Would the
transfer time be acceptable in this case ?
  
No. Image binary data - base64encode - XML - gzip - looks very 
silly. It cannot be efficient. Do you have better ideas?

BTW I do not care about the clients - they must trust the server side.



 Oh, he said he _doesn't care about the clients_ ! ;-)
  
I meant *safety* here: clients are going to download program updates 
from the server. So if they do not trust the server then they should not 
use it. The server is different: it must be safe against external 
attacks. Maybe it was my bad English? Sorry for the misunderstanding.

 In general I would avoid that. Try to better estimate the speed
requirements, to see if you really need do to this.
  
I cannot predict acceptable speed requirements, but I can tell that 
there will be some clients downloading 100MB report files from the 
server, so I presume that I will need a progress bar. I think that I 
need to develop my own protocol for this, and probably the underlying 
layer should use binary representation.

Before I start re-inventing the wheel:

- Is there another (already existing) higher level framework that I can
try? It should be safe and fast, that is the only restriction.



 There's Twisted.
 http://twistedmatrix.com/projects/core/documentation/howto/servers.html
  
Yes, I tried twisted before and I did not like it. It forces me to 
things that I do not want to do. (I cannot tell what it was - it was two 
years ago.)

- Do you think that it is a good idea to use xdrlib? I haven't seen
projects using it directly. For me it is like the rotor module was - it



 It's probably the best way to send binary stuff over the network.
But, again, I would avoid doing so.
  
It is NOT the best way. Just to tell one example: big endian / little 
endian integers. Definitely I need some encoding.


(But if you are right and this is the best way, why would you avoid?)

 L


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Re: pickle internals

2008-05-19 Thread Gabriel Genellina

En Mon, 19 May 2008 07:52:25 -0300, Rustom Mody [EMAIL PROTECTED] escribió:

 I am trying to understand pickle internals.
 This involves:
 -- the algorithm(s) used for traversal arbitrary structures
 -- the pickle format
 -- the use if any of introspection

 I'll be thankful for any pointers

Use The Source, Luke!
See pickle.py and pickletools.py - you may post here any questions you have 
then.

-- 
Gabriel Genellina

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Re: Using Python for programming algorithms

2008-05-19 Thread Roel Schroeven


Bruno Desthuilliers schreef:
1/ being interpreted or compiled (for whatever definition of these 
terms) is not a property of a language, but a property of an 
implementation of a language.


2/ actually, all known Python implementations compile to byte-code.



You keep saying that, and in theory you're right. But I'm still inclined 
to disagree with it, since the practical reality is different. Python is 
indeed compiled to byte code, but if you compare that byte code with 
assembly code you'll see that there's a whole world of difference 
between the two, largely because of the dynamical nature of Python. Fact 
is that Python was designed from the start to run on a virtual machine, 
not on the native hardware.


C OTOH was designed to be compiled to assembly code (or directly to 
machine code) and as a result there are no (or virtually) no 
implementations that interpret C or compile it to bytecode.


I love Python, but IMHO it's a bit silly to maintain that the fact that 
Python compiles to byte code instead of assembly code/machine code is 
purely a matter of implementation; on the contrary, I believe it's a 
result of its design. I also think that there's a large difference 
between byte code and machine code (in Python's case; I haven't looked 
at other languages), and that it's a bit silly to try to trivialize that 
difference.


--
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven
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Re: Organizing a Python project

2008-05-19 Thread Terry Reedy


[EMAIL PROTECTED] wrote in message 
news:[EMAIL PROTECTED]
| Hello all,
|
| I'm starting work on what is going to become a fairly substantial
| Python project, and I'm trying to find the best way to organize
| everything. The project will consist of:
|
| - A few applications
| - Several small scripts and utilities
| - Unit tests and small interactive test programs
| - A number of custom libraries and modules that may be shared and
| referenced among all of the above
|
| I have the following general structure in mind:
|
| myproject/
|  app1/
|main.py

If you put myproject in Pythonxy/Lib/site-packages, there is no need to 
fiddle with PYTHONPATH or sys.path.  In 3.0a5 I tried a relative import and 
got a message that relative imports only work within packages, not modules. 
I presume that means package.__init__.py.  Maybe I just miswrote the 
import, but I decided to stick with what dependably works whether from 
within or without the package
from package.subpackage import module  #or
from package.subpackage.module import object.

I agree with the comment about removing the 'shared' package layer.
Two packages deep is enough typing unless the deeper hierarchy is needed 
(like possibly the 'tests' subsubpackages, if they make running the tests 
easier).

tjr



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Re: How do you use Python in non-GUI work?

2008-05-19 Thread Ken Starks


John Salerno wrote:

Hey all. Just thought I'd ask a general question for my own interest. Every 
time I think of something I might do in Python, it usually involves creating a 
GUI interface, so I was wondering what kind of work you all do with Python that 
does *not* involve any GUI work. This could be any little scripts you write for 
your own benefit, or what you do at work, if you feel like talking about that! 
:)

Thanks.

The vast majority of my Python work is Non-GUI.

As an example, this weekend, I wrote a script to help
in making a 'Lyrics' track in an audacity file, which
is (more-or-less) an XML variety.

In audacity, I created 'markers' in the file (as
the song played) at the start of each line. The result
was 'blank' markers at the correct times:

labeltrack name=Lyrics numlabels=25

label t=18.50121034 t1=18.50121034 title=/

label t=24.34844390 t1=24.34844390 title=/

!-- Etc --

/labeltrackl


My Python script took a text file, and inserted the words, as well
as a title for the whole song.


labeltrack name=Lyrics numlabels=26
label t=0.25 t1=0.25 title=Katie Melua. 'Nine million 
bicycles in Beijing' /
label t=18.50121034 t1=18.50121034 title=There are nine 
million bicycles in Beijing,/

label t=24.34844390 t1=24.34844390 title=Thatapos;s a fact,/
label t=27.12436227 t1=27.12436227 title=Itapos;s a thing we 
canapos;t deny,/



!-- Etc --

/labeltrackl


(The script used FourSuite)

You can do this in FourSuite itself, but it can be error-prone if
you miss out one.

I can this in 'Scite' a text editor which puts your input in one window, 
and the output in another. Scite is a text editor that comes free with

Ruby, by the way.
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Re: explain this function to me, lambda confusion

On May 18, 10:41 am, inhahe [EMAIL PROTECTED] wrote:
  Both the responses offer lambda free alternatives. That's fine, and
  given the terse documentation and problems that I had understanding
  them, I would agree. So what applications are lambdas suited to? I
  think the parameterised function model is one.
  What else?

 i've hardly ever used lambdas since map() and filter() were replaced by list
 comprehension.  two other uses I can think of for it are: using it as a
 sorting key (which takes a function and lambdas are perfect for that when a
 direct function isn't available. for example, lambda x: x.myName), and I
 made an irc bot once that certain events had a list of fuctions that would
 be called after that event.  it was like being able to dynamically add and
 remove event handlers.  for example what if you asked the user a question
 and you wanted to know for the next input whether it was from that user and
 was an answer to that question.  sometimes the function to add would be very
 simple, so writing a def for it would just be ugly.

lambda is handy in defining parse actions in pyparsing.  Parse actions
are callbacks to be run when an expression within a larger grammar is
matched.  A common use for parse actions is to do some sort of text or
type conversion.  The simplest parse actions are called using the list
of matched tokens.  Here is a subexpression that will convert numeric
strings found in a larger grammar to ints:

integer = Word(0123456789).setParseAction(lambda tokens:
int(tokens[0]) )

Since this returns an actual int, there is no need to junk up the post-
parsing code with calls to int(), float(), etc. for these simple
conversions.

Here is an example parse action that just converts a set of matched
words to title case:

title = OneOrMore(Word(alphas)).setParseAction(lambda tokens: 
.join([ t.title() for t in tokens ]) )
print title.parseString(the sun also rises)[0]

prints:
The Sun Also Rises

This second example is about as complex as I'd like to get in a
lambda, though.  Anything more elaborate than that, and I'd go with a
separately defined function.

-- Paul


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Re: Using Python for programming algorithms

Roel Schroeven wrote:

 Bruno Desthuilliers schreef:
 1/ being interpreted or compiled (for whatever definition of these
 terms) is not a property of a language, but a property of an
 implementation of a language.
 
 2/ actually, all known Python implementations compile to byte-code.
 
 
 You keep saying that, and in theory you're right. But I'm still inclined
 to disagree with it, since the practical reality is different. Python is
 indeed compiled to byte code, but if you compare that byte code with
 assembly code you'll see that there's a whole world of difference
 between the two, largely because of the dynamical nature of Python. Fact
 is that Python was designed from the start to run on a virtual machine,
 not on the native hardware.
 
 C OTOH was designed to be compiled to assembly code (or directly to
 machine code) and as a result there are no (or virtually) no
 implementations that interpret C or compile it to bytecode.
 
 I love Python, but IMHO it's a bit silly to maintain that the fact that
 Python compiles to byte code instead of assembly code/machine code is
 purely a matter of implementation; on the contrary, I believe it's a
 result of its design. I also think that there's a large difference
 between byte code and machine code (in Python's case; I haven't looked
 at other languages), and that it's a bit silly to try to trivialize that
 difference.

I strongly disagree. See the Java which is compiled to bytecode
*explicitly*, jet the JVM-bytecode is closer to Python than to what C++ is
compiled to. But then, it's possible to have JIT-compilers that bring
machine code back into the picture.

And see python + psyco as JIT. 

And OTOH see Objective-C and it's runtime for an example of a
machine-code-compiled language that still has huge dynamic runtime parts. 

All these blur the image extremely and make Bruno's point: compilation is an
artifact, not some inherent property of a language.

Diez


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Re: Showing the method's class in expection's traceback

2008-05-19 Thread Agustin Villena

On May 18, 4:31 pm, Diez B. Roggisch [EMAIL PROTECTED] wrote:
 Agustin Villena schrieb:



  Hi!

  is there anyway to show the class of amethodin an exception's
  traceback?

  For example, the next code

  class Some(object):
  def foo(self,x):
  raise Exception(x)

  obj = Some()
  obj.foo(some arg)

  produces the next traceback

  Traceback (most recent call last):
File string, line 231, in run_nodebug
File G:\dev\exceptions\sample.py, line 7, in module
  obj.foo(some arg)
File G:\dev\exceptions\sample.py, line 3, in foo
  raise Exception(x)
  Exception: some arg

  I want to improve the line
  File G:\dev\exceptions\sample.py, line 3, in foo

  to
  File G:\dev\exceptions\sample.py, line 3, in Some.foo

  Is this improvement feasible

 It should be. You can get a dictionary of the locals of an exception
 stack frame, of which you could extract the self-parameter's class.

 Diez

Hi!

I digged on sys.exc_info() object and the traceback module and I
could't figure how I can get the locals() of the exception stackframe

Any advice?

Thanks
  Agustin
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printing class dict

2008-05-19 Thread [EMAIL PROTECTED]

hi,
i am a newbie. so bear wth me
i wrote a program like this
--
class H(object):
 def __init__( self):
  self.data =10
 def e ( self ):
  pass
 def f ( self ):
  pass

class H1(H):
x2 = 11
def __init__(self):
self.x = 10

class details(object):
def data(self,className):
print classname.__dict__
print classname.__name__
print classname.__bases__

bc = details()
bc.data(H1)

when i run it, i get error like this
NameError: global name 'classname' is not defined

can't i pass 'class' like an 'object'?

any suggestions to access other classes details inside a class?
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Re: printing class dict