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• Why would it be necessary to subclass from object in Python?

  - by rmh

  I've been using Python for quite a while now, and I'm still unsure as to why you would subclass from object. What is the difference between this: class MyClass(): pass And this: class MyClass(object): pass As far as I understand, object is the base class for all classes and the subclassing is implied. Do you get anything from explicitly subclassing from it? What is the most "Pythonic" thing to do?

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• Where can i find good practice python problems with solutions?

  - by user319045

  Where can i find good practice python problems with solutions? I'm looking for detailed practice problems that are designed with a coding purpose in mind.

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• How can I turn a single element in a list into multiple elements using Python?

  - by Trivun

  I have a list of elements, and each element consists of four seperate values that are seperated by tabs: ['A\tB\tC\tD', 'Q\tW\tE\tR', etc.] What I want is to create a larger list without the tabs, so that each value is a seperate element: ['A', 'B', 'C', 'D', 'Q', 'W', 'E', 'R', etc.] How can I do that in Python? I need it for my coursework, due tonight (midnight GMT) and I'm completely stumped.

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• python : in which timezone is it a specific time right now?

  - by kevin

  i have users from all timezones, and i want to send out alerts at around 8AM in each users respective timezone. i need a python script that runs every hour [in a cron job] and i need to find out at which timezone it is 8AM right now, and i can use that info to select the users that have to receive the alerts. how do i go about doing this? there seems to be gmt+14 to gmt-12 that is 27 timezones, and there are only 24 hours in a day!

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• How do I use Python to prevent a file from being copied?

  - by Zachary Brown

  I have a file that I need to "protect" so that it cannot be copied! I am using Python on Windows XP. I think it may just be changing file permissions??

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• Is there a way around coding in Python without the tab, indent & whitespace criteria?

  - by Donny V.

  I want to start using Python for small projects but the fact that a misplaced tab or indent can throw a compile error is really getting on my nerves. Is there some type of setting to turn this off? I'm currently using NotePad++. Is there maybe an IDE that would take care of the tabs and indenting?

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• Silent the stdout of a function in python without trashing sys.stdout and restoring each function ca

  - by Tim McJilton

  Is there a way in python without wrapping a function call like following? from sys import stdout from copy import copy tempstdout = copy(stdout) stdout = file("trash",w) foo() stdout = tempstdout That way works but appears to be terribly inefficient. There has to be a better way... I would appreciate any insight I can get into this.

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• What is the purpose of subclassing the class "object" in Python?

  - by ignoramus

  All the Python built-ins are subclasses of object and I come across many user-defined classes which are too. Why? What is the purpose of the class object? It's just an empty class, right?

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• In Python, how do I do a string replacement AND retrive the replaced substring?

  - by mike

  In Perl, I would write: $x = "abbbc"; $x =~ s/(b+)/z/; print "Replaced $1 and ended up with $x\n"; # "Replaced bbb and ended up with azc" How do I do this in Python -- do a regular-expression string replacement and record what it was that got replaced?

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• compiling QGIS Plugin using make

  - by user1675014

  On a fresh mac os x 10.8 install, i've Quantum GIS Installed from Kingchaos binaries and running fine. I'm trying to develop a plugin for QGIS, and using Plugin Builder. The skel that Plugin Builder, produces, should work off-the-shelf, but it does not compile using the makefile. Somewhere python can't find (pyuic.py), and it searches for (/Users/kyngchaos/...), path. This user does not exist on my system:( Here are my ENVS on .profile: export PATH=/Library/Frameworks/GDAL.framework/Programs:$PATH export PYTHONPATH=/Applications/QGIS.app/Contents/Resources/python export DYLD_LIBRARY_PATH="/Applications/QGIS.app/Contents/MacOS/lib:/Applications/Qgis.app/Contents/Frameworks" export PATH="/Applications/QGIS.app/Contents/MacOS/bin:$PATH" Here is the ouptput of make: Arthur@teste:make pyuic4 -o ui_teste.py ui_teste.ui /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python: can't open file '/Users/kyngchaos/Applications/qgis-python27/Applications/QGIS.app/Contents/MacOS/../Resources/python/PyQt4/uic/pyuic.py': [Errno 2] No such file or directory make: *** [ui_teste.py] Error 2 thanks for reading.

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• Nginx frontend for AppEngine dev server

  - by benasio

  How to configure nginx for load static ? Static should be given only by the nginx server , everything else nginx + dev_appserver and workingon the same host (localhost or localhost: port) Example request html http://localhost -> nginx -> dev_appserver request static files http://localhost -> nginx

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• how to make a python or perl script portable to both linux and windows?

  - by Tim

  I was wondering how to make a python script portable to both linux and windows? One problem I see is shebang. How to write the shebang so that the script can be run on both windows and linux? Are there other problems besides shebang that I should know? Is the solution same for perl script? Thanks and regards!

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• Monitor Yahoo! Instant Messages in Python?

  - by Zachary Brown

  I am trying to add some security to my computer at home and would like to have a copy of all Yahoo! IMs sent to me. I am using Python 2.6 on Windows. I would also like to have every URL in Internet Explorer sent to me.

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• Python ORM that auto-generates/updates tables and uses SQLite?

  - by Jason Miesionczek

  I am doing some prototyping for a new desktop app i am writing in Python, and i want to use SQLite and an ORM to store data. My question is, are there any ORM libraries that support auto-generating/updating the database schema and work with SQLite?

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• Is there an image phase correlation library available for Python?

  - by kamasudra

  A project that involves image processing, i.e. to calculate the angular shift of the same image when shifted by a medium of certain Refractive Index. We have to build an app that correlates the 2 images (phase/2D correlation?) and then plot using Chaco and Mayavi (2 libraries in Python). Is there any other existing template software (FOSS) that we can base our app on, or use it as a reference?

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• Search backward through a string using a regex (in Python)?

  - by John Mulder

  I'm parsing some code and want to match the doxygen comments before a function. However, because I want to match for a specific function name, getting only the immediately previous comment is giving me problems. Is there a way to search backward through a string using the Python Regex library? Is there a better (easier) approach that I'm missing?

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• How do I iterate over all lines of files passed on the commandline in Python?

  - by Tg

  I usually do this in Perl: whatever.pl while(<>) { #do whatever; } then cat foo.txt | whatever.pl Now, I want to do this in Python. I tried sys.stdin but I have no idea how to do as I have done in Perl. How can I read the input? Thanks. EDIT: Thanks, I like every single solution.

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• How can I find the dimensions of a matrix in Python?

  - by PBD10017

  How can I find the dimensions of a matrix in Python. Len(A) returns only one variable. Edit: Hi Thanks. close = dataobj.get_data(timestamps, symbols, closefield) Is (I assume) generating a matrix of integers (less likely strings). I need to find the size of that matrix, so I can run some tests without having to iterate through all of the elements. As far as the data type goes, I assume it's an array of arrays (or list of lists).

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• Command line tool in python in a fixed root directory ...

  - by koleto

  I would like to install my python application as a command line tool that should work entirelly inside the install directory (for example C:\Python26\Lib\site-packages\application) The problem is I would like to reffer in runtime to the submodules and resources from within the application directory three. If I install the app with [console_scripts] option the default path is the current directory. Is there a elegant way to keep the current execution path of the application to the site-packages directory? Thanks

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• taking a character input in python from a file?

  - by mekasperasky

  in python , suppose i have file data.txt . which has 6 lines of data . I want to calculate the no of lines which i am planning to do by going through each character and finding out the number of '\n' in the file . How to take one character input from the file ? Readline taken the whole line .

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• Python : How to intercept a method call which does-not exists?

  - by Yugal Jindle

  I want to create a class that doesn't gives an Attribute Error on call of any method that may or may not exists: My class: class magic_class: ... # How to over-ride method calls ... Expected Output: ob = magic_class() ob.unknown_method() # Prints 'unknown_method' was called ob.unknown_method2() # Prints 'unknown_method2' was called Now, unknown_method and unknown_method2 doesn't actually exists in the class, but how can we intercept the method call in python ?

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• What does a b prefix before a python string means ?

  - by kriss

  In a python source code I stumbled upon I've seen a small b before a string like in: b"abcdef" I know of u prefix that means unicode and r prefix that means raw. What does the b stand for and in which kind of source code is it useful as it seems to be exactly like a plain string without any prefix ?

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• setting proxy in appengine plugin netbeans

  - by Bunny Rabbit

  how can i set proxy in the netbeans app engine plugin ? so that the it works like command line appcfg -p proxy:port update application_name i want to do this because i am behind a proxy.

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• How do I convert a unicode to a string at the Python level?

  - by Thierry Lam

  The following unicode and string can exist on their own if defined explicitly: >>> value_str='Andr\xc3\xa9' >>> value_uni=u'Andr\xc3\xa9' If I only have u'Andr\xc3\xa9' assigned to a variable like above, how do I convert it to 'Andr\xc3\xa9' in Python 2.5 or 2.6?

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• Why can't iterate over a listProerty an appengine?

  - by Juanjo Conti

  I've just got this error from Google App Engine: TypeError: argument of type 'ListProperty' is not iterable why?

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