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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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• (Python/Django): How do I keep my production db in sync (scheme and data) and with dev pc db?

  - by Emilio

  Hello, newbie here. i have a local Postgre database which will be filled with data (daily) on my local development machine. What is a good solution to transfer/sync/mirror this data to a production postgre database. For what it's worth I'm developing in Python using Dajngo. Thanks!

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• Is it possible to store Python class objects in SQLite?

  - by lakshmipathi

  I would like to store Python objects into a SQLite database. Is that possible? If so what would be some links / examples for it?

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• Why should Python PEP-8 specify a maximum line length of 79 characters?

  - by pcorcoran

  Why in this millenium should Python PEP-8 specify a maximum line length of 79 characters? Pretty much every code editor under the sun can handle longer lines. What to do with wrapping should be the choice of the content consumer, not the responsibility of the content creator. Are there any (legitimately) good reasons for adhering to 79 characters in this age?

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• How to recovery source python code (.py) from .pyo file?

  - by celka

  I need to convert a compiled python code (.pyo) to its source . I look in depython.net, but there is a problem. A warning; "File version older than 2.4." What should I do? Thanks.

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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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• [Python] How to create a named temporary file in memory?

  - by conradlee

  I would like to use Python's tempfile module to create a temporary file that I will use for communication between processes (use of pipes is awkward). The documentation I've linked to above shows two functions that almost do what I want: tempfile.NamedTemporaryFile # For creating named tempfiles tempfile.SpooledTemporaryFile # For creating tempfiles in memory but actually I want a tempfile that is both named AND in memory. Any ideas?

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• How to store an arbitrarily long int to a binary file in python?

  - by Mark

  How can I store and retrieve the number 2**10000 in a binary file in python without converting it to a string? Can it be stored as 10,000 bits?

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• Exercise 7.9 in "How to Think Like a Computer Scientist (python)" measuring occurrences of a character in a string

  - by Abie

  The question is how to write a program that measures how many times a character appears in a string in a generalizable way in python. The code that I wrote: def countLetters(str, ch): count=0 index=0 for ch in str: if ch==str[index]: count=count+1 index=index+1 print count when I use this function, it measures the length of the string instead of how many times the character occurs in the string. What did I do wrong? What is the right way to write this code?

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• How can I check for unused import in many Python files?

  - by Thierry Lam

  I remember when I was developing in C++ or Java, the compiler usually complains for unused methods, functions or imports. In my Django project, I have a bunch of Python files which have gone through a number of iterations. Some of those files have a few lines of import statement at the top of the page and some of those imports are not used anymore. Is there a way to locate those unused imports besides eyeballing each one of them in each file? All my imports are explicit, I don't usually write from blah import *

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• What is the cleanest way to do a sort plus uniq on a Python list?

  - by knorv

  Consider a Python list my_list containing ['foo', 'foo', 'bar']. What is the most Pythonic way to uniqify:ing and sorting and the list (think cat my_list | sort | uniq)? This is how I currently do it and while it works I'm sure there are better ways to do it. my_list = [] ... my_list.append("foo") my_list.append("foo") my_list.append("bar") ... my_list = set(my_list) my_list = list(my_list) my_list.sort()

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• How do I use python-webkit2png to take many screenshots at the same time?

  - by oldfellow

  I've got thousands of urls from many hosts I need to screenshot. I can use the lib fine from the command line, but how can I integrate it into my code so I can take multiple screenshots simultaneously? I think it's something to do with xvfb as with the answer to this question: http://stackoverflow.com/questions/1747022/how-to-kill-headless-x-server-started-via-python but I'm not sure what exactly.

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• Python 2.5.2 script that add "The function starts here" to all the functions of the files of a direc

  - by user248959

  Hi, i would like to replace the lines function *{ by function *{echo "The function starts here." where * is what ever. Any idea how to do that in Python? Regards Javi

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• Printing Variable names and contents as debugging tool; looking for emacs/Python shortcut

  - by Schof

  I find myself adding debugging "print" statements quite often -- stuff like this: print("a_variable_name: %s" % a_variable_name) How do you all do that? Am I being neurotic in trying to find a way to optimize this? I may be working on a function and put in a half-dozen or so of those lines, figure out why it's not working, and then cut them out again. Have you developed an efficient way of doing that? I'm coding Python in Emacs.

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• How to embed the Python interpreter in a Qt app?

  - by George Edison

  Is there a straightforward way to embed the Python interpreter in a Qt application? I am hoping for a cross-platform solution if possible.

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• Do you use Python mostly for its functional or object-oriented features?

  - by Eric

  I see what seems like a majority of Python developers on StackOverflow endorsing the use of concise functional tools like lambdas, maps, filters, etc., while others say their code is clearer and more maintainable by not using them. What is your preference? Also, if you are a die-hard functional programmer or hardcore into OO, what other specific programming practices do you use that you think are best for your style? Thanks in advance for your opinions!

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• Is there image phase correlation libraries 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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• how to traverse a file in python and c++ in backward way? And also store data in backward (bottom to

  - by mekasperasky

  Suppose i want to store 3 lines in a file both in python and C++ . I want to store it like this aaa bbb ccc .. But i am giving ccc input first then bbb then aaa. How will I traverse the file from bottom to top and also store from bottom to top/?

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• Easy way to find "not enough arguments..." in python logging library.

  - by Piotr Czapla

  Do you know any easy way to find a logging call that throws "not enough argumenst for format string". On my workstation I've modified logging/__init__.py to print the msg so I can easily find the line in the source. But do you have any idea what to do on the testing environment where you can't change python standard library nor run pdb easily?

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• Python vs Groovy vs Ruby? (based on criteria listed in question)

  - by Prembo

  Considering the criteria listed below, which of Python, Groovy or Ruby would you use? Criteria (Importance out of 10, 10 being most important) Richness of API/libraries available (eg. maths, plotting, networking) (9) Ability to embed in desktop (java/c++) applications (8) Ease of deployment (8) Ability to interface with DLLs/Shared Libraries (7) Ability to generate GUIs (7) Community/User support (6) Portability (6) Database manipulation (3) Language/Semantics (2)

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• Is there any lib for python that will get me the synonyms of a word?

  - by daniels

  Is there any api/lib for python that will get me the synonyms of a word? For example if i have the word "house" it will return "building, domicile, mansion, etc..."

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• How do I simulate a progress counter in a command line application in Python?

  - by CRP

  My Python program does a series of things and prints some diagnostic output. I would also like to have a progress counter like this: Percentage done: 25% where the number increases "in place". If I use only string statements I can write separate numbers, but that would clutter the screen. Is there some way to achieve this, for example using some escape char for backspace in order to clear a number and write the next one? Thanks

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• How do I use python to hit this command and return the result?

  - by alex

  $whois abc.com I want to use python to hit this command, and then give the result as a String of text. How can I do that?

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• How can I paste some string to the active window in Python?

  - by Shady

  Can someone make me an example or explain to me how can I paste something to the active window with Python? I've edited because I didn't know that paste to the clipboard doesnt paste to the active window...

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• Can I use python to create flash like browser games?

  - by Davoud Taghawi-Nejad

  Hello, is it possible to use python to create flash like browser games? (Actually I want to use it for an economic simulation, but it amounts to the same as a browser game) Davoud

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