Re: [Solved] SIP installation and usage on windows
On Apr 9, 7:41 pm, Gabriel Genellina wrote:
> omnia neo gmail.com> writes:
>
>
>
>
>
> > On Apr 9, 10:42 am, omnia neo wrote:
> > > On Apr 9, 10:30 am, Stefan Behnel wrote:
>
> > > > omnia neo, 09.04.2010 07:01:
>
> > > > > import siptest
>
> > > > > I get following error :
> > > > > import error : no module named siptest
>
> > > > Is the directory where your siptest.dll lies in your PYTHONPATH
> (sys.path)?
> > > well I added PYTHONPATH = in my environment variables
> > > (windows XP).
>
> > well I just tried this too.
> > I added the path using sys.path on the fly in my python script as
> > follows:
>
> > ###
> > import sys
> > sys.path.append("")
> > print sys.path
> > import siptest
> > ###
>
> > again same error:
> > ImportError: No module named siptest.
>
> Make sure the extension module must is called siptest.pyd, not
> siptest.dllhttp://docs.python.org/extending/windows.html
> (I'd expect SIP to take care of this)
>
> --
> Gabriel Genellina- Hide quoted text -
>
> - Show quoted text -
SIP tool installation steps are as follows:
• Download latest SIP from:
http://www.riverbankcomputing.co.uk/software/sip/download
and unzip to any location.
• Make sure python is in PATH of environment variables -> PATH = %PATH
%;C:\python26
• Go to cmd promt -> go to the SIP location (location of download) ->
run :/python configure.py
• It will take all the default setting for configuration, the default
directories will be in c:\python26 (change if required)
• Go to Start -> programs -> MS visual studios -> visuals studio tools-
> command prompt. Go to SIP folder (location of download)
• \> nmake -> this will run makefile and build sip.exe and sip.pyd
• \> nmake install -> this will copy: sip.exe, sip.pyd,sip.h,
sipconfig.py, sipdistutils.py in C:\python26
• Go to the folder where the manually written .sip file is present in
command prompt and run the following:
sip -e -j 1 -c . xyz.sip
Steps to create an extension module:
1. Create a “.sip” specification file for the C/C++ library
a. Follow the syntax definitions as given in
http://www.riverbankcomputing.co.uk/static/Docs/sip4/specification_files.html#syntax-definition
b. Appropriately add the C/C++ classes, functions, methods and
structures in the specification file.
2. Run the SIP tool utility on the specification file to create the
intermediate C/C++ code.
3. Copy and edit the simple build script as shown in
http://www.riverbankcomputing.co.uk/static/Docs/sip4/using.html#a-simple-c-example
4. Run the build script to create the makefile, the CModule, the .sbf
files
5. Run Visual Studios nmake utility on the makefile to create the .pyd
file which is the final module which can be imported from python.
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Re: Extracting an undefined number of items from a list
On Apr 12, 9:26 pm, Steven D'Aprano wrote: > # The obfuscated, fragile way > map( itemgetter(0), sorted( > zip(db, range(1, len(db)+1)), key=lambda t: t[1] if t[1] in i else -1 > )[-len(i):] ) I have to hand it to you that this might, in fact, be "the" obfuscated, fragile way, but I gotta tell you that I'm certain there exist other ways that are considerably less obfuscated and considerably less fragile that I, personally would still consider to be obfuscated and fragile... The only thing you get points off for is the lack of a multiply or divide by 10. The original data set is just crying out for such a thing, and, while it might not do all that much for the obfuscation, it would certainly help with the fragility. ;-) Regards, Pat -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting an undefined number of items from a list
On Mon, 12 Apr 2010 13:05:30 -0700, vsoler wrote: > Hi everyone, > > say that 'db' is a list of values > say 'i' is a list of indexes > I'd like to get a list where each item is i-th element of db. > > For example: > > db=[10,20,30,40,50,60,70,80,90] #undefined length > i=[3,5,7] #undefined length then > result=[30,50,70] # resulting list > > how can I do this? Others have given a simple solution using list comprehensions. Here's another few ways. # The beginner's way result = [] for index in i: # "i" is a bad name for a list of indexes x = db[index - 1] # shift from one-based counts to zero-based result.append(x) # The advanced functional way from operator import itemgetter indexes = map(lambda n: n-1, i) # adjust for one-based counts result = itemgetter(*indexes)(db) # The obfuscated, fragile way map( itemgetter(0), sorted( zip(db, range(1, len(db)+1)), key=lambda t: t[1] if t[1] in i else -1 )[-len(i):] ) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
It's a fact not lost on the opportunity to see yourself
http://www.google.com/url?sa=D&q=http://osamah2000.jeeran.com/daauageralmuslmeen1.htm&usg=AFQjCNGQhhGz-1TGv9Y7gE8zKwHHustJCg -- http://mail.python.org/mailman/listinfo/python-list
Re: What license/copyright text to include and where to include it when selling a commercial Python based application?
On 2010-04-12 17:02 PM, Malcolm Greene wrote: Looking for advice on what Python license and copyright text to include and where to include it when selling a commercial (Windows based) Python based application. The requirement is fairly broad; there are a number of things you could do to satisfy the requirement. Largely, it's up to you as long as the full license text is accessible somewhere. I will provide personal, entirely unofficial recommendations below, though. By license text and copyrights I am refering to the text on this page: PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 http://www.python.org/download/releases/2.6.5/license/ By "where to include it" I mean: 1. What Python license text/copyright text should I place in our printed user manual? The whole license and history text, parts A and B. 2. What Python license text/copyright text should I include in our online documentation? The whole thing. 3. What Python license text/copyright text should I include in product's license text file? Have a licenses\ directory with a LICENSE_Python.txt containing the whole license text. Have other LICENSE_.txt files for any other third-party libraries you use, like the GUI toolkit. 4. What Python license text/copyright text should I include in application's splash screen and about dialog boxes? Link to the part of the online documentation that lists the third-party software that you use. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
What license/copyright text to include and where to include it when selling a commercial Python based application?
Looking for advice on what Python license and copyright text to include and where to include it when selling a commercial (Windows based) Python based application. By license text and copyrights I am refering to the text on this page: PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 http://www.python.org/download/releases/2.6.5/license/ By "where to include it" I mean: 1. What Python license text/copyright text should I place in our printed user manual? 2. What Python license text/copyright text should I include in our online documentation? 3. What Python license text/copyright text should I include in product's license text file? 4. What Python license text/copyright text should I include in application's splash screen and about dialog boxes? Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Startup problems with Python 3.1.2 and PythonPath under XP
tkp...@hotmail.com wrote: > I fixed the problem by creating a file call MyPath.pth that has only > one line > H:/Python > > and placing it in the C:\Python31\Lib\site-packages directory. So as a > practical matter, my problem is solved. That said, I'm still puzzled > by why Python 3.1 acts up when I set the environment variable > PYTHONPATH. It certainly caused no problem with the 2.X series. Most likely, H:\Python contains a module with a name that conflicts with the standard library. Starting IDLE tries to import that module - but not from the standard library, but your own version. That module then (of course) fails to work correctly. By putting in a pth file, h:\python is *appended* to sys.path, not prepended. However, the real fix is not to use module names that conflict with the standard library. Run idle.py in a cmd.exe shell window to find out what the true cause of the problem is. HTH, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Destructor being called twice?
Longpoke wrote: > So either this test case is wrong to assume the destructor can only be > called once, or there is a bug in Python? Or perhaps more likely you misunderstand what is happening here. Maybe there are two separate instances of A()? If I remember correctly gtk wraps C objects in Python wrappers when they are accessed from Python code. A python wrapper isn't created until it is needed and it is destroyed as soon as it is no longer needed. Since don't save a Python reference to your A() instance when you create it I'd expect the original wrapper is destroyed and the another one created later when needed. The test does hang on to the gobj reference so there's only going to be a single wrapper. -- http://mail.python.org/mailman/listinfo/python-list
Download Visual Studio Express 2008 now
Microsoft has just released Visual Studio 2010, along with its free (of charge) Express edition. Following a tradition, they are likely to withdraw support and availability for VS 2008 Express some time in the future. Python 2.6, 2.7, and 3.1 are all built with that release (i.e. 2008). Because of another long tradition, Python extension modules must be built with the same compiler version (more specifically, CRT version) as Python itself. So to build extension modules for any of these releases, you need to have a copy of VS 2008 or VS 2008 Express. If you are planning to build Python extension modules in the next five years, I recommend that you obtain a copy of VS Express, just in case Microsoft removes it from their servers. As mentioned, it's free of charge. When downloading it for later use, it's probably best to get the offline ISO image release, available from http://www.microsoft.com/express/Downloads/#2008-All Disclaimer: I'm not connected with Microsoft or its release process. Any claim on future actions that Microsoft may take is purely hypothetical. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: 2.7 beta 1
On Apr 12, 11:39 am, Terry Reedy wrote: > On 4/12/2010 1:57 AM, Mensanator wrote: > > > Likewise, I usually don't shut down > > when I leave work, so I can't allow orphaned processes to accumulate > > eating up CPU and memory. > > So don't. I don't. I'm complaining about the need to do that. > > Orphaned processes only accumulate when you use Restart Shell to abandon > a process stuck in an infinite loop. Surely, you don't expect me to beleive that Python has solved the halting problem and knows when its in an infinite loop? No, Restart Shell is used whenever the process is going to take longer than one is willing to wait. > I personally very seldom do that. > Otherwise, the old process dies in a few seconds and the number of > pythonw processes drops back down from 3 to the normal 2. You've never written a program that takes more than a few seconds to execute? Wow. > > As I already said, either roboot or use TaskManager to kill such > zombies. Do we need to add something to the documentation to explain this? Something along the lines of: "Python simply doesn't work properly. You must keep constant vigilance on the TaskKanager to watch for orphaned processes, otherwise they will consume all your CPU cycles and eat up your memory."? Maybe put it in large red letters under the caption "WARNING!"? > When I had a unix desktop machine, I routinely used the command > line equivalents ps (process status) and kill to do the same thing. No wonder you don't see the problem! You think it's normal! > > Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Destructor being called twice?
Longpoke gmail.com> writes: > So either this test case is wrong to assume the destructor can only be > called once, or there is a bug in Python? Destructors can be called more than once in CPython, but other implementations have proper finalization behavior. -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting an undefined number of items from a list
On 12 abr, 22:11, Patrick Maupin wrote: > On Apr 12, 3:05 pm, vsoler wrote: > > > Hi everyone, > > > say that 'db' is a list of values > > say 'i' is a list of indexes > > I'd like to get a list where each item is i-th element of db. > > > For example: > > > db=[10,20,30,40,50,60,70,80,90] #undefined length > > i=[3,5,7] #undefined length > > then result=[30,50,70] # resulting list > > > how can I do this? > > With a list comprehension: > > >>> db=[10,20,30,40,50,60,70,80,90] > >>> i=[3,5,7] > >>> [db[x-1] for x in i] > > [30, 50, 70] > > Regards, > Pat Thank you Patrick, Your quick answer only tells me how much I still have to learn. -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting an undefined number of items from a list
On Mon, Apr 12, 2010 at 1:05 PM, vsoler wrote: > Hi everyone, > > say that 'db' is a list of values > say 'i' is a list of indexes > I'd like to get a list where each item is i-th element of db. > > For example: > > db=[10,20,30,40,50,60,70,80,90] #undefined length > i=[3,5,7] #undefined length > then result=[30,50,70] # resulting list > > how can I do this? result = [db[k-1] for k in i] # your indices seem to be 1-based See "List comprehensions": http://docs.python.org/tutorial/datastructures.html#list-comprehensions Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting an undefined number of items from a list
On Apr 12, 3:05 pm, vsoler wrote: > Hi everyone, > > say that 'db' is a list of values > say 'i' is a list of indexes > I'd like to get a list where each item is i-th element of db. > > For example: > > db=[10,20,30,40,50,60,70,80,90] #undefined length > i=[3,5,7] #undefined length > then result=[30,50,70] # resulting list > > how can I do this? With a list comprehension: >>> db=[10,20,30,40,50,60,70,80,90] >>> i=[3,5,7] >>> [db[x-1] for x in i] [30, 50, 70] Regards, Pat -- http://mail.python.org/mailman/listinfo/python-list
Extracting an undefined number of items from a list
Hi everyone, say that 'db' is a list of values say 'i' is a list of indexes I'd like to get a list where each item is i-th element of db. For example: db=[10,20,30,40,50,60,70,80,90] #undefined length i=[3,5,7] #undefined length then result=[30,50,70] # resulting list how can I do this? -- http://mail.python.org/mailman/listinfo/python-list
Re: 2.7 beta 1
On Apr 12, 3:51 am, alex23 wrote: > Mensanator wrote: > > You think the right thing to do is just quietly work > > around the problem and sit back and laugh knowing sooner > > or later someone else will get burned by it? > > Haven't we covered argument from fallacy enough in this group by now? > > Reporting the bug was exactly the right thing to do. Loudly > pronouncing the impending demise of 3.x because of it was not. Coming > up with exaggerated parodies of arguments that no one here is actually > making is even worse. > > > Why do you guys think I'm talking about the language? I'm talking > > about a particular implementation. > > Probably because _you_ made no such restriction with your blanket > statement of "3.x won't be adopted by developers until it's fixed". If > only "under Windows", "probably" and "IDLE" had been injected into it, > I don't think there would have been a word of disagreement. Ok. If more people are aware of the issue now, then the hyperbole has served it's purpose. -- http://mail.python.org/mailman/listinfo/python-list
Re: Startup problems with Python 3.1.2 and PythonPath under XP
I fixed the problem by creating a file call MyPath.pth that has only one line H:/Python and placing it in the C:\Python31\Lib\site-packages directory. So as a practical matter, my problem is solved. That said, I'm still puzzled by why Python 3.1 acts up when I set the environment variable PYTHONPATH. It certainly caused no problem with the 2.X series. -- http://mail.python.org/mailman/listinfo/python-list
Destructor being called twice?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hi,
Is it normal for the destructor to be called more than once? This code
caused it to happen:
import gtk
class A(gtk.Window):
def __init__(self):
gtk.Window.__init__(self)
self.connect("delete-event", lambda w,e: gtk.main_quit())
def __del__(self):
print 'bye', self
if __name__ == '__main__':
A().show()
print 'enter main'
gtk.main()
print 'quitting'
$ python test.py
bye
enter main
bye
quitting
$ python --version
Python 2.6.4
FYI, gtk.Window is a new-style class. There is another thread about
this claiming this is a bug, but the author only mentions it happening
with old-style classes:
http://mail.python.org/pipermail/python-dev/2006-August/068358.html
I don't suspect this is a bug in pygtk, as a grep for __del__ yields
nothing through pygtk's and pygobject's sources (pygobject is a heavy
dependency of pygtk).
Furthermore, pygtk has a test case to ensure __del__ is called after
GC (pygtk-2.16.0/tests/test_gdk.py), and pygobject has one that asserts
__del__ is only called once (pygobject-2.18.0/tests/test_subtype.py).
A snippet from pygobject-2.18.0/tests/test_subtype.py:
def testSimpleDecref(self):
class CallInDel:
def __init__(self, callback):
self.callback = callback
def __del__(self):
if callable(self.callback):
self.callback()
disposed_calls = []
def on_dispose():
disposed_calls.append(None)
gobj = gobject.GObject()
gobj.set_data('tmp', CallInDel(on_dispose))
del gobj
assert len(disposed_calls) == 1 # < !!
So either this test case is wrong to assume the destructor can only be
called once, or there is a bug in Python?
-BEGIN PGP SIGNATURE-
Version: GnuPG v2.0.14 (GNU/Linux)
iEYEARECAAYFAkvDbt0ACgkQ3PGpByoQpZEQBQCbB1pzcOBHWrB4RUqFLaEbKt1E
9a4AoKENPAwQ99g8Y/DJwJqDSQFPGZQ2
=/CUN
-END PGP SIGNATURE-
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mechanize.browser() click or submit related problem
Hello All.
im making some website login function with mechanize.browser() module.
but problem is i can't send submit or click submit button with
mechanize click() function, it not working.
how can i submit button or click() function make it work?
i can make it work mechanize.Request and mechanize.urlopen() 's POST
function,but
this time i want to make it work mechanize.browser() which emulate web
browser.
please help me!
thanks in advance
# -*- coding: utf-8 -*-
import sys,os
import mechanize, urllib
import cookielib
from BeautifulSoup import BeautifulSoup,BeautifulStoneSoup,Tag
import datetime, time
import re,sys,os,mechanize,urllib,threading,time, socket
br = mechanize.Browser()
# Cookie Jar
cj = cookielib.LWPCookieJar()
br.set_cookiejar(cj)
# Browser options
br.set_handle_equiv(True)
br.set_handle_gzip(True)
br.set_handle_redirect(True)
br.set_handle_referer(True)
br.set_handle_robots(False)
# Follows refresh 0 but not hangs on refresh > 0
br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(),
max_time=1)
# Want debugging messages?
br.set_debug_http(True)
br.set_debug_redirects(True)
br.set_debug_responses(True)
br.addheaders = [('User-agent', 'Mozilla/4.0 (compatible; MSIE 7.0b;
Windows NT 5.1)')]
br.clear_history()
br.open('http://xo.nate.com/login.jsp')
html = br.response().read()
#print html
#Show the available forms
for f in br.forms():
print f
# Select the first (index zero) form
#br.select_form(nr=1)
br.select_form(name='f_login')
# Let's search
br.form['ID']= 'prudy'
#br.form['user_password']=['on']
br.form['PASSWD']= 'sotkfkd'
print br.geturl()
br.submit()
html = br.response().read()
print html
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Startup problems with Python 3.1.2 and PythonPath under XP
I run Python under Windows XP SP3, and for the longest time, I have installed it on my C: drive under C:\PythonXX (XX = 20, 21., 26), and maintained all my Python files on our network in a directory called H:\Python that I point to by creating an environment variable called PYTHONPATH. I recently installed 3.1.2 under C:\Python31, and now IDLE crashes every single time Python 3.1 starts up. If I remove PYTHONPATH, it starts up without a problem. The mystery deepens - Python 2.6 starts without a hiccup with or without PYTHONPATH! What could the issue be? Is there any other way to have H:\Python appended to sys.path when I start Python 3.1? Thank you in advance for your help and advice Thomas Philips -- http://mail.python.org/mailman/listinfo/python-list
Re: rich comparison fscks up reference count?
On Apr 12, 4:27 pm, Gerhard Häring wrote: > Maybe somebody can enlighten me here. I can't figure out why doing a > rich comparison on my object decreases the total reference count by 1. [...] Doh! It turned out the strange effect was due to my particular build process. My Python 2.6/3.1 are built using our own SCons-based build and the corresponding Makefile that distutils then uses didn't have the same DEFINEs. So, the Python was built with Py_REF_DEBUG, but Py_REF_DEBUG was not defined when I built my extension module. Which fscked up the *total* reference counting (sys.gettotalrefcount()). -- Gerhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading in a file
On Mon, Apr 12, 2010 at 11:31 AM, Maggie wrote:
> hello,
>
> i have a basic script i need to implement. i need below code to read
> in a file and perform operation is it designed to do:
>
> #!/usr/bin/python
>
> import sys
>
> feed = sys.stdin.readlines()
This sounds like homework, so here are some clues:
sys.stdin is a file object.
open('/path/to/file.here', 'r') creates a new readable file object
representing the file at the given path.
You should be able to figure it out from there.
Cheers,
Chris
--
s/aaa/bbb/
http://blog.rebertia.com
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Reading in a file
hello, i have a basic script i need to implement. i need below code to read in a file and perform operation is it designed to do: #!/usr/bin/python import sys feed = sys.stdin.readlines() for temp in feed: line = temp.split() if len(line) == 3: if (line[0] == "xmax" or line[0] == "xmin"): time = line[2] print str(line[0]) + " " + str(line[1]) + " " + str(float(time)*2/3) else: print temp else: print temp i appreciate your help in advance.. -- http://mail.python.org/mailman/listinfo/python-list
Re: raise exception with fake filename and linenumber
En Fri, 09 Apr 2010 23:19:48 -0300, kwatch escribió:
On 4月8日, 午後12:52, "Gabriel Genellina" wrote:
The built-in SyntaxError exception does what you want. Constructor
parameters are undocumented, but they're as follows:
raise SyntaxError("A descriptive error message", (filename,
linenum, colnum, source_line))
colnum is used to place the ^ symbol (10 in this fake example). Output:
Traceback (most recent call last):
File "1.py", line 9, in
foo()
File "1.py", line 7, in foo
raise SyntaxError("A descriptive error message", (filename,
linenum, colnum, "this is line 123 in example.file"))
File "example.file", line 123
this is line 123 in example.file
^
SyntaxError: A descriptive error message
By the way, is it hard to specify any other exception class instead of
SyntaxError?
The SyntaxError class is a good solution in my case, but if possible,
I want to know
more general solution to specify filename and linenum for exception.
You can always store any info you want in the exception object, just write
__str__ accordingly.
The advantage of SyntaxError is that it is special-cased in the
interpreter itself as to add some spaces and the ^ character.
The disadvantages are already pointed out by Dennis Lee Bieber and aren't
minor.
--
Gabriel Genellina
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Re: How to read file during module import?
En Fri, 09 Apr 2010 19:16:14 -0300, Jeremy escribió: On Apr 9, 4:02 pm, "Gabriel Genellina" wrote: En Fri, 09 Apr 2010 18:04:59 -0300, Jeremy escribió: > A related question: Can I parse the data once and keep it somewhere > instead of reading the supporting file every time? I tried pickling > but that wouldn't work because I have custom classes. (Either that or > I just don't know how to pickle—this is a highly probable event.) What kind of "custom classes"? My custom classes are not very fancy. They basically are dictionaries and lists organizing the data in the supporting file. I was actually surprised they didn't pickle because the classes were so simple. # pickle some_object with open(filename, "wb") as f: pickle.dump(some_object, f, -1) When I did this I got the following error: PicklingError: Can't pickle : it's not found as __main__.element Am I just being dumb? No, but maybe you're redefining 'element': py> from pickle import dumps py> class Foo(object): ... pass ... py> x = Foo() py> class Foo(object): ... pass ... py> dumps(x) Traceback (most recent call last): ... pickle.PicklingError: Can't pickle : it's not the same obj ect as __main__.Foo Using reload() may lead to this error too. Basically, the class says: "I am 'DonQuijote', from module 'LaMancha'". But nobody at LaMancha knows DonQuijote, or they say DonQuijote is a different person. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: gps coordinate identification
Luis Quesada wrote: Dear all, Given a gps coordinate, I would like to find out the country the coordinate belongs to. I wonder whether there is a python library that offers this capability... (In case somebody here is looking for the same thing) Somebody in sci.geo.satellite-nav suggested using geopy: http://code.google.com/p/geopy/wiki/ReverseGeocoding Indeed, it is exactly what I was looking for. Cheers, Luis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to read file during module import?
En Sun, 11 Apr 2010 19:43:03 -0300, HigStar escribió: I have had trouble with the __file__ attribute in the past, when using py2exe (i.e. on the windows platform) and using the bundle feature (which zips all files). Using os.path.realpath( __file__ ) resolves to something like .../ library.zip/packageName/fileName Then when trying to perform an open on a file, say .../library.zip/ packageName/supportingPackageName, the file can not be found. Use pkgutil.get_data then: http://docs.python.org/library/pkgutil.html#pkgutil.get_data -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Sometimes the python shell cannot recognize the presence of an attribute.
2010/4/12 Ricardo Aráoz : > Because . ... Guido says so: http://www.python.org/dev/peps/pep-0008/ -- Cheers, Simon B. -- http://mail.python.org/mailman/listinfo/python-list
Re: Sometimes the python shell cannot recognize the presence of an attribute.
Aahz wrote: > In article , > Justin Park wrote: > >> The real problem is this. When I started working on the package, >> somehow all of indentations were made by space-bars instead of using >> tabs. But when I am implementing my own on top of it, I still use tabs >> to make indentations. >> > > Stop using TAB. Allowing TAB was a mistake. Spaces are the One True > Way when formatting Python code. > Because . -- http://mail.python.org/mailman/listinfo/python-list
Re: python and enigma2
On 12 Apr, 19:10, luca72 wrote: > Hello i have a dvb decoder with enigma2 inside, The enigma2 plugin can > be made with python. > In my plugin i have to use pyserial, but in the decoder the python2.5 > reply in this way: > r...@bm750:/var/pyserial-2.5-rc2# python setup.py install > Traceback (most recent call last): > File "setup.py", line 8, in > from distutils.core import setup > ImportError: No module named distutils.core > > How i can install distutils? > > Thanks > > Luca Sorry i try to install setuptolls i get this : r...@bm750:/var# sh setuptools-0.6c11-py2.5.egg exec: 8: python2.5: not found I see anly the python executable andno other folder can you hel me Regards -- http://mail.python.org/mailman/listinfo/python-list
python and enigma2
Hello i have a dvb decoder with enigma2 inside, The enigma2 plugin can be made with python. In my plugin i have to use pyserial, but in the decoder the python2.5 reply in this way: r...@bm750:/var/pyserial-2.5-rc2# python setup.py install Traceback (most recent call last): File "setup.py", line 8, in from distutils.core import setup ImportError: No module named distutils.core How i can install distutils? Thanks Luca -- http://mail.python.org/mailman/listinfo/python-list
Pickle
I have a problem using Pickle inside a class object.
The following code works:
m2 = markov_model.MarkovModel()
m2 = pickle.load(open("prueba", 'rb'))
print m2.n
However, if I create the following method inside markov_model.MarkovModel:
def load_model_from_file(self, name):
try:
file = open(name, 'rb')
self = pickle.load(file)
file.close()
except pickle.PicklingError:
print "PicklingError"
and then run:
m2 = markov_model.MarkovModel()
m2.load_model_from_file("prueba")
print m2.n
it says that 'MarkovModel' object has no attribute 'n'. If the printing of
'n' i put it inside (at the end) of the method load_model_from_file as
'print self.n' it works.
How can i solve this?
Thanks
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Re: 2.7 beta 1
On 4/12/2010 1:57 AM, Mensanator wrote: Likewise, I usually don't shut down when I leave work, so I can't allow orphaned processes to accumulate eating up CPU and memory. So don't. Orphaned processes only accumulate when you use Restart Shell to abandon a process stuck in an infinite loop. I personally very seldom do that. Otherwise, the old process dies in a few seconds and the number of pythonw processes drops back down from 3 to the normal 2. As I already said, either roboot or use TaskManager to kill such zombies. When I had a unix desktop machine, I routinely used the command line equivalents ps (process status) and kill to do the same thing. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Sometimes the python shell cannot recognize the presence of an attribute.
In article , Justin Park wrote: > >The real problem is this. When I started working on the package, >somehow all of indentations were made by space-bars instead of using >tabs. But when I am implementing my own on top of it, I still use tabs >to make indentations. Stop using TAB. Allowing TAB was a mistake. Spaces are the One True Way when formatting Python code. -- Aahz (a...@pythoncraft.com) <*> http://www.pythoncraft.com/ "It is easier to optimize correct code than to correct optimized code." --Bill Harlan -- http://mail.python.org/mailman/listinfo/python-list
Re: Replacing Periods with Backspaces
All, Thanks for all the help I finally got it. I ended up not having to get rid of the periods. Thanks again! Gerad -- http://mail.python.org/mailman/listinfo/python-list
ANN: Pyrex 0.9.9
Pyrex 0.9.9 is now available: http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/ Highlights of this release: * Some facilities for interfacing with C++ code have been added. * Changes have been made to the semantics of exception catching to improve efficiency. * Preparation is being made for making 'not None' the default for extension type parameters to Python functions. A more detailed discussion of these changes can be found in the release notes here: http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/version/Doc/Release_Notes_0.9.9.html What is Pyrex? -- Pyrex is a language for writing Python extension modules. It lets you freely mix operations on Python and C data, with all Python reference counting and error checking handled automatically. -- http://mail.python.org/mailman/listinfo/python-list
Re: Tempering Client Expectations (OT)
[Big snip] Heh, my wife and I joke that in those "can this marriage be saved" newspaper columns, every answer boils down to "communication is key". Keep the customer tightly in the loop with regular communication -- frequent feedback regarding progress, costs, and whether your shared understanding coincides helps prevent developers from wandering off for 6months only to come back with 6mo of costs for a project that doesn't meet the client's expectations. The customer may cut you off if progress is too slow or costly, but the earlier that happens, the less pain for both parties. -tkc You've obviously never worked on a UK MOD contract. By definition, everything has to be delivered at least five years late and millions if not billions overspent. Still, it's only taxpayers money. Going OT a fair way, for those who don't know, I quote from an MOD QA guy that I spoke to. Her Majesty's Government never buys anything that has faults in it Hence when a Chinook flew into a mountainside killing umpteen highly skilled people, it was put down to being pilot error, despite the fact that it was completely against regulations to blame the pilot when there was no evidence to back it up, plus the minor little detail that the engine control system FADEC was already suspect. The UK magazine Computer Weekly fought a long and hard battle to protect the pilots name. They might as well have hit their heads against a brick wall. Democracy, please don't make me laugh. Oh, and see this http://www.computerweekly.com/Articles/2010/01/14/239954/ faulty-safety-critical-software-changed-after-fatal-mull.htm Kindest regards. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Pickle
gerardob a écrit :
I have a problem using Pickle inside a class object.
The following code works:
m2 = markov_model.MarkovModel()
m2 = pickle.load(open("prueba", 'rb'))
Given the second line, the first is totally useless.
print m2.n
However, if I create the following method inside markov_model.MarkovModel:
def load_model_from_file(self, name):
try:
file = open(name, 'rb')
self = pickle.load(file)
This doesn't work - or, more exactly, this doesn't work the way you
expect it to work !-)
Remember that there's nothing magical with 'self' - it's just a local
name in a function. Rebinding it within the function's body only affects
the function's local namespace.
What you want is to make load_model_from_file a classmethod and make it
return the unpickled object instead.
file.close()
except pickle.PicklingError:
print "PicklingError"
Useless exception handling - you lose all the relevant informations.
and then run:
m2 = markov_model.MarkovModel()
m2.load_model_from_file("prueba")
print m2.n
it says that 'MarkovModel' object has no attribute 'n'. If the printing of
'n' i put it inside (at the end) of the method load_model_from_file as
'print self.n' it works.
Indeed - at this stage, the *local* 'self' name has been rebound to the
unpickled object.
Also and fwiw, if you expect a MarkovModel instance to have a 'n'
attribute, you should bind it (at least to a sensible default value) in
the class __init__ method.
How can i solve this?
cf above.
HTH
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Python Pickle
I have a problem using Pickle inside a class object.
The following code works:
m2 = markov_model.MarkovModel()
m2 = pickle.load(open("prueba", 'rb'))
print m2.n
However, if I create the following method inside markov_model.MarkovModel:
def load_model_from_file(self, name):
try:
file = open(name, 'rb')
self = pickle.load(file)
file.close()
except pickle.PicklingError:
print "PicklingError"
and then run:
m2 = markov_model.MarkovModel()
m2.load_model_from_file("prueba")
print m2.n
it says that 'MarkovModel' object has no attribute 'n'. If the printing of
'n' i put it inside (at the end) of the method load_model_from_file as
'print self.n' it works.
How can i solve this?
Thanks.
--
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Re: Tempering Client Expectations (OT)
On Mon, Apr 12, 2010 at 10:29 AM, Tim Chase wrote: > your own inaccurate assumptions and answer those, please. >> > > > Heh, my wife and I joke that in those "can this marriage be saved" > newspaper columns, every answer boils down to "communication is key". Keep > the customer tightly in the loop with regular communication -- frequent > feedback regarding progress, costs, and whether your shared understanding > coincides helps prevent developers from wandering off for 6months only to > come back with 6mo of costs for a project that doesn't meet the client's > expectations. The customer may cut you off if progress is too slow or > costly, but the earlier that happens, the less pain for both parties. > Yeah, that's pretty much where I'm seeing it, too. Parameterize customer expectations as much as practicable up front so it's less painful down the road. Thanks, beno > > > -- http://mail.python.org/mailman/listinfo/python-list
Re: rich comparison fscks up reference count?
Can be run like this: ghaer...@ws124~/src/gh/test$ python3 setup.py build_ext --inplace running build_ext building 'foo' extension gcc -fno-strict-aliasing -g -fwrapv -O0 -Wall -Wstrict-prototypes - arch i386 -m32 -I/opt/jetstream/include/python3.1 -c foo.c -o build/ temp.macosx-10.4-i386-3.1-pydebug/foo.o foo.c: In function ‘PyInit_foo’: foo.c:109: warning: return makes pointer from integer without a cast gcc -bundle -undefined dynamic_lookup -arch i386 -m32 build/ temp.macosx-10.4-i386-3.1-pydebug/foo.o -o /Users/ghaering/src/gh/test/ foo.so [50367 refs] ghaer...@ws124~/src/gh/test$ python3 setup.py test running test total refcount 65304 total refcount 65305 total refcount 65304 total refcount 65303 total refcount 65302 total refcount 65301 total refcount 65300 total refcount 65299 total refcount 65298 total refcount 65297 [45322 refs] ghaer...@ws124~/src/gh/test$ -- http://mail.python.org/mailman/listinfo/python-list
rich comparison fscks up reference count?
Maybe somebody can enlighten me here. I can't figure out why doing a rich comparison on my object decreases the total reference count by 1. Linked is the minimal test case with a C exension that compiles under both Python 2.6 and 3.1. No external dependencies, except a DEBUG build of Python to see the effect (Py_REF_DEBUG defined). http://cdn.ghaering.de/foo.c http://cdn.ghaering.de/setup.py Builtin types like list, dict, etc. don't seem to have the same effect. I've also run the test a few thousand times; then the total refcount is like -5, but Python does not crash. Also if I print all objects and their respective refcounts using the gc module, none of them seems to have a negative refcount, but the total refcount is still way negative. How could that be? -- Gerhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Tempering Client Expectations (OT)
On 04/12/2010 06:37 AM, Victor Subervi wrote: On Sat, Apr 10, 2010 at 3:14 PM, Tim Chase wrote: 1) Preeminently, address second-order ignorance. [elided kvetch] "second-order ignorance" is a technical term (not intended so much as a slur) for "not knowing what you don't know". If you google the phrase, you'll get several articles/papers on the topic (I think I first learned about the hierarchy in an issue of Dr. Dobbs or CACM/Queue magazine). The brief summary is: 0th order ignorance (0OI): I provably know the material 1st order ignorance (1OI): I know that I don't know something (for me, e.g. sports...I know my sports-knowledge is nigh non-existent). For you, it might be the inner workings of HTTP or SQL transactions. You now know that you don't know it, but you could go read up and learn the topics and their best-practices. 2nd order ignorance (2OI): I don't know what I don't know...if you don't know what you need to learn in order to develop a web application (so my email's "learn HTTP, HTML, ..." comment moves you from 2OI to 1OI because now you have a list of things to learn). 3rd order ignorance (3OI): I don't know how to find out what I don't know (in your case, you've asked the mailing list, just as you could ask any respectable web-developer, so you know how to find out what you don't know and thus aren't 3OI) 4th order ignorance (4OI): commonly described as "not knowing about the various orders of ignorance" :) Pay attention to my question, don't make up your own based on your own inaccurate assumptions and answer those, please. The topic was setting accurate estimates and tempering client expectations (TCE). If you don't have a foundation regarding what you do/don't know, you can't set accurate estimates, so TCE consists of "I need to learn what technologies are involved in doing this, and then learn those technologies". Once you've moved from 2nd to 1st order ignorance, your TCE shifts to "I know that technologies X, Y, and Z are involved, but I only know X and will have to learn Y & Z before I can produce a satisfactory result". If I were a client, I'd want to know the level/depth of my vendor/supplier's expertise. So perfectly relevant to the thread. 4) Don't be afraid to reuse existing technologies: could installing osCommerce on a $3/month web-server and tweaking the PHP code have sufficed for what you need? Could you have used Django+Satchmo to get yourself up and running with proven code, tweaking what you need? I remember you dismissing the suggestion to use existing web-frameworks. Bringing that up again, are you? I was all but done with the shopping cart when you suggested I re-invent the wheel based on another technology. Yeah, sure, throw out 10,000 lines of the 12,000 line program so I can rebuild on a new technology. Brilliant, that. Thanks for the suggestion. Now, can we get back to my question? If you're throwing out 10k lines of code that has only seen one core developer and hasn't been tested in the real world against real hackers satisfying real customers; and you're replacing it with a proven-in-the-real-world framework that has been worked on by multiple professional developers, then yes, that's exactly what I'm suggesting. It hurts to throw away that much work, and I've had to do just that (in my case, printing from PocketPC devices, having written my own printer-drivers for mobile printers). There's an personal attachment to code you've spent hours upon hours writing. But unless that effort nets you big wins over merely tweaking a proven solution, your hurting your customer(s). 6) As for "Tempering Client Expectations" (the subject line of this OT post), Ah, so you *did* recognize what *my* question was! Good! If you're just realizing that by the time you get to item #6, I'm glad to see you read my entire email before getting testy. True. I ended up taking a bath on it, and I believe that was merited since it was my first client project. Now, I'm dealing with scope-creep and trying to work my way out of it, and looking ahead at how to avoid complications like this in the future. Heh, my wife and I joke that in those "can this marriage be saved" newspaper columns, every answer boils down to "communication is key". Keep the customer tightly in the loop with regular communication -- frequent feedback regarding progress, costs, and whether your shared understanding coincides helps prevent developers from wandering off for 6months only to come back with 6mo of costs for a project that doesn't meet the client's expectations. The customer may cut you off if progress is too slow or costly, but the earlier that happens, the less pain for both parties. -tkc -- http://mail.python.org/mailman/listinfo/python-list
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Re: 2.7 beta 1
Mensanator wrote: On Apr 10, 11:51�pm, alex23 wrote: Mensanator wrote: 3.x won't be adopted by WINDOWS developers WHO USE IDLE until it's fixed. I think you left your hyperbole level too high so I turned it down for you. I don't know of _anyone_ who uses IDLE to run production code, nor do I follow how one errant IDE shows that Python 3.x as a language is broken. Planning to buy a Toyota? No, on the grounds that I have an Enterprise Probike, which being chain driven is vastly superior to any gas guzzling petrol or diesel driven vehicle. Ok, it's slower, but it gets me there in the end. Mark Lawrence -- http://mail.python.org/mailman/listinfo/python-list
Re: tools for network adminstrator
On Mon, Apr 12, 2010 at 5:56 PM, prakash jp wrote: > Hi all, > > Can any one mention a list of python based tools (existant / could be > developed) which network administrators might need. > Not sure if you might like, but there's an O'Reilly book titled "Python for Unix and Linux System Administration". -- regards, kushal -- http://mail.python.org/mailman/listinfo/python-list
Re: Refresh Problem
On Mon, Apr 12, 2010 at 9:03 AM, Victor Subervi wrote: > On Sun, Apr 11, 2010 at 4:29 PM, Tim Chase > wrote: > >> On 04/11/2010 02:53 PM, MRAB wrote: >> >>> Victor Subervi wrote: >>> Hi; I send variables to a script. The script adds appropriate lines into a database of an order to my shopping cart. When I refresh the screen, as no doubt some customers will do, it re-ads those orders. Now, I can delete them, but that's not the point. I don't want it to re-ad the orders. How do I skirt this problem? When you click on the Submit button on the form it should post the >>> data, >>> ie use method="post", not method="get". If refreshing causes it to >>> re-submit, then you're using the wrong method. This is basic stuff. >>> >> >> And if you do POST your data (which you should if you're attempting to >> change state on the server), you should use a post/redirect/get pattern[1]. >> This will prevent the browser from giving the "you've already submitted >> this data; do you want to resubmit it?" message that most should give you if >> you refresh a POST'ed page. >> >> And therein demonstrates the need to know HTTP as mentioned in my previous >> reply to you (VS, not MRAB). >> > > Man, I just forget this stuff. Dunno why. Yeah, just set a var in the URL > of the post. Right. Sorry. Thanks. > beno > > Correction. I was not familiar with Post/Redirect/Get. Thanks, Tim beno -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] [RELEASED] 2.7 beta 1
On Sun, Apr 11, 2010 at 1:13 AM, average wrote: > > There are so many features taken from 3.0 that I fear that it will > postpone its adoption interminably (it is, in practice, treated as > "beta" software itself). By making it doctrine that it won't be > official until the next "major" Python release, it will encourage > those who are able, to just make the jump to 3.0, while those who > cannot will have the subtle pressure to make the shift, however > gradual. > Additionally, it will give the community further incentive > to make Python3 all that it was intended to be. Personally, the > timing of v3 prevented me from fully participating in that effort, > and, not ignoring the work of those who did contribute, I think many > of us feel that it has not reached its potential. The same problem. For me it was possible to participate in standard library development only after Python Alphas with Windows binaries were released. I could test both new features and old bugs. Having a requirement that every developer should be able to compile binaries has an adverse effect on the quality of standard library. The absence of public Roadmap also makes it hard to judge the aforementioned "desired potential". It could be possible to compile a public list like http://dungeonhack.sourceforge.net/Roadmap I am afraid of two things with forthcoming Python releases. 1. feature creeping 2. feature missing And an overview of Python development in the form of release timer and roadmap will remove the remnants of fear and uncertainty and surely attract new people for sprints. Regardless of said above it is great to feel the hard work behind the scenes that makes new releases popping up. Thanks. -- anatoly t. -- http://mail.python.org/mailman/listinfo/python-list
Re: Refresh Problem
On Sun, Apr 11, 2010 at 4:29 PM, Tim Chase wrote: > On 04/11/2010 02:53 PM, MRAB wrote: > >> Victor Subervi wrote: >> >>> Hi; >>> I send variables to a script. The script adds appropriate lines into a >>> database of an order to my shopping cart. When I refresh the screen, as >>> no doubt some customers will do, it re-ads those orders. Now, I can >>> delete them, but that's not the point. I don't want it to re-ad the >>> orders. How do I skirt this problem? >>> >>> When you click on the Submit button on the form it should post the data, >> ie use method="post", not method="get". If refreshing causes it to >> re-submit, then you're using the wrong method. This is basic stuff. >> > > And if you do POST your data (which you should if you're attempting to > change state on the server), you should use a post/redirect/get pattern[1]. > This will prevent the browser from giving the "you've already submitted > this data; do you want to resubmit it?" message that most should give you if > you refresh a POST'ed page. > > And therein demonstrates the need to know HTTP as mentioned in my previous > reply to you (VS, not MRAB). > Man, I just forget this stuff. Dunno why. Yeah, just set a var in the URL of the post. Right. Sorry. Thanks. beno -- http://mail.python.org/mailman/listinfo/python-list
Re: Write web apps in Python?
Gilles Ganault, 12.04.2010 11:57: I'd like to make sure I understand what the options are to write web applications in Python: - à la PHP, using Apache's mod_python - using eg. Lighttpd and configuring it to load the Python interpreter every time a Python script is called (www.jakehilton.com/?q=node/54) - long-running process, by compiling the Python script as a stand-alone program that will then wait for queries on a port and being called by the web server through eg. the WSGI Those are "deployment" options, not "write" (== design/implementation) options. If you stick to a WSGI compatible framework, you are free to deploy your application any way you like or need, depending on the specific context or environment. As for writing apps, I can either built it from scratch, or use frameworks like Pylons, TurboGears, or Django. Amongst tons of other options, as already pointed out. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Write web apps in Python?
On 12 abr, 06:57, Gilles Ganault wrote: > Hello > > I'd like to make sure I understand what the options are to write web > applications in Python: > > - à la PHP, using Apache's mod_python > > - using eg. Lighttpd and configuring it to load the Python interpreter > every time a Python script is called (www.jakehilton.com/?q=node/54) > > - long-running process, by compiling the Python script as a > stand-alone program that will then wait for queries on a port and > being called by the web server through eg. the WSGI > > As for writing apps, I can either built it from scratch, or use > frameworks like Pylons, TurboGears, or Django. > > Is this correct? > > Thank you. You should first investigate the different python web frameworks, choose one and then use the deployment options supported by your choice. These frameworks support several ways to deploy your apps, such as those you mentioned. If you want an easy way to get started for free, check the Google App Engine. It's the google infraestructure to host web apps (written in python or Java), and it's free as long as you don't surpass the limited quotas on bandwith and data used (which are quite generous). You don't need to set up anything. All you need is a google account to get started. Luis -- http://mail.python.org/mailman/listinfo/python-list
tools for network adminstrator
Hi all, Can any one mention a list of *python based tools* (existant / could be developed) which network administrators might need. Regards Prakash -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and Regular Expressions
On 2010-04-11, Steven D'Aprano wrote: > On Sat, 10 Apr 2010 10:11:07 -0700, Patrick Maupin wrote: >> On Apr 10, 11:35??am, Neil Cerutti wrote: >>> On 2010-04-10, Patrick Maupin wrote: >>> > as Pyparsing". ??Which is all well and good, except then the OP will >>> > download pyparsing, take a look, realize that it uses regexps under >>> > the hood, and possibly be very confused. >>> >>> I don't agree with that. If a person is trying to ski using pieces of >>> wood that they carved themselves, I don't expect them to be surprised >>> that the skis they buy are made out of similar materials. >> >> But, in this case, the guy ASKED how to make the skis in his woodworking >> shop, and was told not to be silly -- you don't use wood to make skis -- >> and then directed to go buy some skis that are, in fact, made out of >> wood. > > As entertaining as this is, the analogy is rubbish. You should have seen the car engine analogy I thought up at first. ;) > Skis are far too simple to use as an analogy for a parser (he > says, having never seen skis up close in his life *wink*). > Have you looked at PyParsing's source code? Regexes are only a > small part of the parser, and not analogous to the wood of > skis. I was mainly trying to get accross my incredulity that somebody should be surprised a parsing package uses regexes under the good. But for the record, a set of downhill skis comes with a really fancy interface layer: URL:http://images03.olx.com/ui/1/85/66/13147966_1.jpg -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: Tempering Client Expectations (OT)
On Sat, Apr 10, 2010 at 3:14 PM, Tim Chase wrote: > 1) Preeminently, address second-order ignorance. Tim, throughout this post, you're way out of line. The s/w I have already built for this client works just fine. It's not a matter or not having the tools or not knowing how to use them. Pay attention to my question, don't make up your own based on your own inaccurate assumptions and answer those, please. Stick to the topic. 4) Don't be afraid to reuse existing technologies: could installing osCommerce on a $3/month web-server and tweaking the PHP code have sufficed for what you need? Could you have used Django+Satchmo to get yourself up and running with proven code, tweaking what you need? I remember you dismissing the suggestion to use existing web-frameworks. Bringing that up again, are you? I was all but done with the shopping cart when you suggested I re-invent the wheel based on another technology. Yeah, sure, throw out 10,000 lines of the 12,000 line program so I can rebuild on a new technology. Brilliant, that. Thanks for the suggestion. Now, can we get back to my question? > > 5) Regarding scope-creep, Yeah, that's where we should have been all along, Tim. > it's a problem most developers & analysts face, but there are several > mitigating methods you can use. Experience from past projects helps gauge > time for future projects and only your own experience will suffice. If you > don't have any past projects (personal deployments or school projects) > you're not yet remotely ready to give estimates. Even after you've done > multiple projects, estimation is still as much an art as a science. > Obviously. > > Also, get the client to sign off on basic features in very small bite-sized > increments, addressing highest-priority needs first. If at any time the > client sees a failure to progress at the rate they expect, they can pull the > plug losing far less of their investment keeping the most important features > developed thus-far. Part of a developer/analyst's job is to get a good idea > of a project's scope. Examining all edge cases, looking for > infrequently-used processes, probing exceptions, building a mental-model > that corresponds to the client's mental-model... > Now you're talking. > > 6) As for "Tempering Client Expectations" (the subject line of this OT > post), Ah, so you *did* recognize what *my* question was! Good! > it seems the biggest gap involved not communicating to your client/friend > "I'm using your project as a learning experience for multiple complicated > technologies and I have minimal idea what is involved so there's no possible > way I could give you an accurate estimate of scope or cost" > True. I ended up taking a bath on it, and I believe that was merited since it was my first client project. Now, I'm dealing with scope-creep and trying to work my way out of it, and looking ahead at how to avoid complications like this in the future. Thanks, beno > > > -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about LLVM
Hannes, 12.04.2010 12:56: I heard that its possible to use LLVM to speed up Python. Can anybody explain to me, how that works? http://code.google.com/p/unladen-swallow/ Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Write web apps in Python?
On Mon, 12 Apr 2010 12:13:17 +0200, Daniel Fetchinson wrote: >For additional info have a look at http://wiki.python.org/moin/WebProgramming Thanks for the link. -- http://mail.python.org/mailman/listinfo/python-list
Question about LLVM
Hi Pythoneers, I heard that its possible to use LLVM to speed up Python. Can anybody explain to me, how that works? thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: About Python execution speed
Thank you Chris and Stefan, this was the answer I was looking for. Leonardo Giordani -- http://mail.python.org/mailman/listinfo/python-list
Re: Classes as namespaces?
Aahz a écrit : In article , kj wrote: What's the word on using "classes as namespaces"? E.g. class _cfg(object): spam = 1 jambon = 3 huevos = 2 breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos) There is one gotcha associated with using classes as namespaces: you have to be careful to avoid instantiating them. That goes triple if you modify the class attributes, because modifying an attribute in an instance does *not* propagate the change to the class. This can be "solved" (using only classmethods and overriding __setattr__), but then it begins to be a bit OOTP for a mostly simple usecase. -- http://mail.python.org/mailman/listinfo/python-list
Re: About Python execution speed
Leonardo Giordani, 12.04.2010 11:51: I'm facing a strange issue in Python execution speed. I'm running the following test script: -8<- dim = 1000 iteration = 10 list1 = [] list2 = [] for i in range(dim): list1.append(float(i)) list2.append(float(i) * 0.264) What about this: list1 = list(map(float, xrange(dim))) list2 = [f * 0.264 for f in list2] for k in range(iteration): for j in range(dim): ris = 0 ris = ris + list1[j] + list2[j] What result do you expect for 'ris' after the last two lines? -8<- which runs in about 80 seconds on my local hardware (mean of multiple execution) If I move the whole code into a function and call this latter the execution time drops to about 45 seconds. What is the reason of this improvement? Local variables in a function can be accessed much faster than globally defined names (which require a dictionary lookup). This is a good thing because the access to local variables tends to be much more performance critical than that to globals. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: About Python execution speed
On Mon, Apr 12, 2010 at 2:51 AM, Leonardo Giordani wrote: > which runs in about 80 seconds on my local hardware (mean of multiple > execution) > If I move the whole code into a function and call this latter the execution > time drops to about 45 seconds. > > What is the reason of this improvement? The top-level module namespace (i.e. global scope) is implemented using a dictionary (i.e. hash table). Names in local function scope instead use precalculated offsets into an array. The latter is faster than the former, hence the speed difference. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Write web apps in Python?
> I'd like to make sure I understand what the options are to write web > applications in Python: > > - à la PHP, using Apache's mod_python > > - using eg. Lighttpd and configuring it to load the Python interpreter > every time a Python script is called (www.jakehilton.com/?q=node/54) > > - long-running process, by compiling the Python script as a > stand-alone program that will then wait for queries on a port and > being called by the web server through eg. the WSGI > > As for writing apps, I can either built it from scratch, or use > frameworks like Pylons, TurboGears, or Django. > > Is this correct? Basically, yes. For additional info have a look at http://wiki.python.org/moin/WebProgramming Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
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Buy Samsung Corby TXT B3210 Mobile
Samsung Corby TXT is a GSM phone. Samsung Corby TXT, a SmartPhone mobile comes with a great list of features. Samsung Corby TXT B3210 is a mobile with a user memory of 38 MB and MicroSD support up to 8 GB of external memory. This simple statement of specifications is sufficient for mobile buffs to gauge the power of Samsung Corby TXT B3210. The Samsung Corby TxT is approximately priced at Rs 7,000 in India. Samsung Corby Txt Specification • Network: GSM, Band 850/900/1800/1900 • Dimension: 59×110x12.9 • Display: TFT LCD 2.2 inch • Battery: 800mAh • Talk Time: up to 10 hrs • Standby: up to 316H • Camera: 2MP, 2x digital zoom • Video player • Video recording • Video messaging • Video streaming • Music Player • MP3 Ringtones • 3D sound technology • Music Recognition • FM Radio • Bluetooth • WAP • USB • PC Sync Application • User Memory: 38 MB • SMS Memory: 500 • Phone Book Entries upto 1000 • External Memory: Upto MicroSD(Upto 8GB) • Speakerphone For more information: http://www.khojle.in/classifieds/mobile/ -- http://mail.python.org/mailman/listinfo/python-list
Write web apps in Python?
Hello I'd like to make sure I understand what the options are to write web applications in Python: - à la PHP, using Apache's mod_python - using eg. Lighttpd and configuring it to load the Python interpreter every time a Python script is called (www.jakehilton.com/?q=node/54) - long-running process, by compiling the Python script as a stand-alone program that will then wait for queries on a port and being called by the web server through eg. the WSGI As for writing apps, I can either built it from scratch, or use frameworks like Pylons, TurboGears, or Django. Is this correct? Thank you. -- http://mail.python.org/mailman/listinfo/python-list
About Python execution speed
Hi all, I'm facing a strange issue in Python execution speed. I'm running the following test script: -8<- dim = 1000 iteration = 10 list1 = [] list2 = [] for i in range(dim): list1.append(float(i)) list2.append(float(i) * 0.264) for k in range(iteration): for j in range(dim): ris = 0 ris = ris + list1[j] + list2[j] -8<- which runs in about 80 seconds on my local hardware (mean of multiple execution) If I move the whole code into a function and call this latter the execution time drops to about 45 seconds. What is the reason of this improvement? Thank you very much in advance. Leonardo Giordani -- http://mail.python.org/mailman/listinfo/python-list
Re: 2.7 beta 1
Mensanator wrote: > You think the right thing to do is just quietly work > around the problem and sit back and laugh knowing sooner > or later someone else will get burned by it? Haven't we covered argument from fallacy enough in this group by now? Reporting the bug was exactly the right thing to do. Loudly pronouncing the impending demise of 3.x because of it was not. Coming up with exaggerated parodies of arguments that no one here is actually making is even worse. > Why do you guys think I'm talking about the language? I'm talking > about a particular implementation. Probably because _you_ made no such restriction with your blanket statement of "3.x won't be adopted by developers until it's fixed". If only "under Windows", "probably" and "IDLE" had been injected into it, I don't think there would have been a word of disagreement. -- http://mail.python.org/mailman/listinfo/python-list
Re: A 'foolproof' way to query inheritance tree? numbers.Real in 2.6)
On Sun, 11 Apr 2010 21:47:59 -0700, Chris Rebert wrote: > On Sun, Apr 11, 2010 at 10:46 AM, > wrote: >> Generally, if I want to know the inheritance tree of a class, I either >> use inspect.getmro or __bases__ >> >> However, after reading about the new numbers module / class tower in >> Python 2.6/3.0, I realized that both of these will fail to show that >> the 'float' type actually inherits from numbers.Real: > > Well, as your introspection shows, it doesn't *actually* inherit from > numbers.Real. > However, it does "implement" the numbers.Real Abstract Base Class (ABC) > and this is reported via the results of issubclass(). Basically, > `issubclass(x, y)` is no longer more-or-less just sugar for `y in > x.__mro__` due to changes that have been made to accommodate ABCs. So this is a "Consenting Adults" inheritance? If I say that MyNumber class inherits from numbers.Real, I'm responsible for making sure that MyNumber has all the appropriate methods defined by numbers.Real because it won't actually inherit any of them. Given a class C, is there some way to find out what classes issubclass(C, X) will return true for? Obviously you can get a partial list, by walking the MRO, but is there a list somewhere of which ABCs consider C a subclass? Presumably the general answer is No, because any class X could happen to have a __subclasscheck__ method that returns True when called with C. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
