🌐 Mailman 3 September 2006 - Python-list - python.org

Threads and Progress Bar
by Ritesh Raj Sarraf Sept. 1, 2006

Sept. 1, 2006

Hi, I have a small application, written in Python, that uses threads. The application uses function foo() to download files from the web. As it reads data from the web server, it runs a progress bar by calling an install of a progress bar class. When using threads, I get the problem that the progress bar gets over-written by the download progress of files from other threads. I believe my change has to go into the progress bar class to make it thread aware. Are they any docs/suggestions on how to implement progress bars along with threads ? Thanks, Ritesh -- Ritesh Raj Sarraf RESEARCHUT - http://www.researchut.com "Necessity is the mother of invention." "Stealing logic from one person is plagiarism, stealing from many is research." "The great are those who achieve the impossible, the petty are those who cannot - rrs"

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Duck typing alows true polymorfisim
by atbusbook＠aol.com Sept. 1, 2006

Sept. 1, 2006

lets say you want a generic numerical algorithom like sum Ruby def sum lst lst.inject(0){|total,current| total*current} end Java // i dont know if there is a numeric super class for numbers class Sum{ public static int sum(int[] lst){ int total = 0; for(int current : lst){ total+=current; } return total; } // repeat for all other number types }

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Question about import and namespace
by jdemoor＠gmail.com Sept. 1, 2006

Sept. 1, 2006

Hi, I'm new to Python and have the following problem : I have an application started by a main.py file, which does a ' from module_1 import * '. main.py is responsible from the creation of an object which is then used in module_1. What is the best way to make that object visible in the module_1 namespace ? I guess that if I do an ' import module_1 ', I can make the object visible with ' module_1.myObject = myObject ', but that won't work with the from ... import * statement. Thanks in advance for your help.

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Re: dictionaries - returning a key from a value
by bearophileHUGS＠lycos.com Sept. 1, 2006

Sept. 1, 2006

Fredrik Lundh: > better in what sense? With better I may mean faster, or needing less memory, or requiring a shorter code, or other things. It depends on many things, related to the program I am creating. Thank you for the timings, you are right, as most times. Sometimes I am wrong, but I try to suggest correct things and I usually try to be helpful, as you do too, and I am learning still. I have done timings for other things, but not for this one :-) I have assumed that the version using iteritems (I think that in Py3.0 items will become iteritems) is the faster in that situation (but your test shows that I was wrong). This seems to require one hash access, plus the iteration: ... for key in sampledict if sampledict[key] ... This seems to require just the iteration plus the key,year tuple creation: ... for key,year in sampledict.iteritems() if year ... I have assumed that the hash access + an interation is slower, but maybe the tuple object creation is slow(er) too. As usual to know what's better in a given Python version you have to test it. Bye, bear hugs, bearophile

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Re: dictionaries - returning a key from a value
by bearophileHUGS＠lycos.com Sept. 1, 2006

Sept. 1, 2006

Avell Diroll: keys = [key for key in sampledict if sampledict[key] == '1974'] Or better, given: sampledict = {'the Holy Grail':1975, 'Life of Brian':1979, 'Party Political Broadcast':1974,'Mr. Neutron':1974, 'Hamlet':1974, 'Light Entertainment War':1974} keys = [key for key,year in sampledict.iteritems() if year == 1974] print keys Another solution is a two-way (bidirectional) dict: http://cheeseshop.python.org/pypi/two_way_dict/0.2 Bye, bearophile

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Egg problem (~/.python-eggs)
by Mike Orr Sept. 1, 2006

Sept. 1, 2006

I'm trying to install a program that uses Durus on a server. It appears that if a Python program uses eggs, it creates a ~/.python-eggs/ directory, so the home directory must be writeable. This conflicts with server environments where you want to run a daemon with minimum privileges. Second, it appears to use the real user ID rather than the effective user ID to choose the home directory. In this case I'm trying to use start-stop-daemon on Linux to start my Python program, switching from user 'root' to user 'apache'. # start-stop-daemon --start --chuid apache:apache --make-pidfile --pidfile /var/run/cameo.pid --exec /var/www/apps/cameo/bin/cameo_server.py -- Traceback (most recent call last): File "/var/www/apps/cameo/bin/cameo_server.py", line 3, in ? from durus.client_storage import ClientStorage File "build/bdist.linux-i686/egg/durus/client_storage.py", line 7, in ? File "build/bdist.linux-i686/egg/durus/serialize.py", line 9, in ? File "build/bdist.linux-i686/egg/durus/persistent.py", line 15, in ? File "build/bdist.linux-i686/egg/durus/_persistent.py", line 7, in ? File "build/bdist.linux-i686/egg/durus/_persistent.py", line 4, in __bootstrap__ File "/usr/local/lib/python2.4/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 799, in resource_filename return get_provider(package_or_requirement).get_resource_filename( File "/usr/local/lib/python2.4/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 1187, in get_resource_filename self._extract_resource(manager, self._eager_to_zip(name)) File "/usr/local/lib/python2.4/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 1204, in _extract_resource real_path = manager.get_cache_path(self.egg_name, self._parts(zip_path)) File "/usr/local/lib/python2.4/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 836, in get_cache_path ensure_directory(target_path) File "/usr/local/lib/python2.4/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 2301, in ensure_directory os.makedirs(dirname) File "/usr/lib/python2.4/os.py", line 156, in makedirs makedirs(head, mode) File "/usr/lib/python2.4/os.py", line 156, in makedirs makedirs(head, mode) File "/usr/lib/python2.4/os.py", line 159, in makedirs mkdir(name, mode) OSError: [Errno 13] Permission denied: '/root/.python-eggs' Can I make it use a different eggs directory? Any other idea how to install a program using eggs on a server? BTW, Python is Gentoo's /usr/bin/python 2.4.2. The eggs are installed in /usr/local/lib/python2.4 to prevent them from mixing with Gentoo packages in /usr/lib. --Mike <sluggoster(a)gmail.com>

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dictionaries - returning a key from a value
by Michael Malinowski Sept. 1, 2006

Sept. 1, 2006

Appologies if this is a somewhat simple question, but currently I can return a value from a dictionary using its key by doing : dDictionary.get( key ) However, I am curious to know if its possible to get the key from giving a value (basically the opposite of what I did above, instead of getting a value from a key, I want the key from a value). Is there a way of doing this? Or would I need to cycle all the keys until I hit a value match (which seems somewhat cumbersome). Cheers Mike.

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Re: introspection
by rick Sept. 1, 2006

Sept. 1, 2006

Fredrik Lundh wrote: > brad tilley wrote: > >> How do I import a module and then ask it to show me its methods or >> other aspects about itself during execution? I'd like to do something >> such as this: >> >> import win32api > > dir(win32api) > help(win32api) > > and also > > import inspect > help(inspect) > > </F> > Great info guys! Thanks.

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Help with autotools
by Jonh Wendell Sept. 1, 2006

Sept. 1, 2006

Hi all! I need help with autotools stuff.. My directory structure: project_name src main.py others.py data ui.glade images.png po translations.po I'd like to do something like that: The files in "src" should be installed at: $prefix/lib/project_name The files in "data" should be installed at: $prefix/share/project_name At $prefix/bin should be create a slink: $prefix/bin/project_name -> $prefix/lib/project_name/main.py The listen (http://listengnome.free.fr/) does this, but it doesn't use autotools... Can anyone help me? I've tried a lot to make this work, but with no success... Thanks, -- Jonh Wendell Santana Analista de Sistemas http://www.bani.com.br MSN: jonhwendell(a)hotmail.com GTalk/Jabber: jonh.wendell(a)gmail.com Linux User #114432

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Re: Django website
by Bruno Desthuilliers Sept. 1, 2006

Sept. 1, 2006

Antal Rutz wrote: > hi, > > is there something wrong with django's website (djangoproject.com) Obviously, yes. > or I have problems? I don't think so. I warned them on the google group, I think things should be fixed soon. -- bruno desthuilliers python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for p in 'onurb(a)xiludom.gro'.split('@')])"

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