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How to extract the n-th elements from a list of tuples?

... *list in arguments to create a parameter list for a function... Note: In Python3, zip returns an iterator, so instead use list(zip(*elements)) to return a list of tuples. share | improve this answ...
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Python Pandas: Get index of rows which column matches certain value

... Not the answer you're looking for? Browse other questions tagged python indexing pandas or ask your own question.
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Get path from open file in Python

...g with it, then you can do that in the following conventional way using os Python module. >>> import os >>> f = open('/Users/Desktop/febROSTER2012.xls') >>> os.path.dirname(f.name) >>> '/Users/Desktop/' This way you can get hold of the directory structure. ...
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Why do I get TypeError: can't multiply sequence by non-int of type 'float'?

... raw_input returns a string (a sequence of characters). In Python, multiplying a string and a float makes no defined meaning (while multiplying a string and an integer has a meaning: "AB" * 3 is "ABABAB"; how much is "L" * 3.14 ? Please do not reply "LLL|"). You need to parse the str...
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python pandas: apply a function with arguments to a series

I want to apply a function with arguments to a series in python pandas: 4 Answers 4 ...
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How can strings be concatenated?

How to concatenate strings in python? 7 Answers 7 ...
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Add up a column of numbers at the Unix shell

... python3 -c"import os; print(sum(os.path.getsize(f) for f in open('files.txt').read().split()))" Or if you just want to sum the numbers, pipe into: python3 -c"import sys; print(sum(int(x) for x in sys.stdin))" ...
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Why use argparse rather than optparse?

I noticed that the Python 2.7 documentation includes yet another command-line parsing module. In addition to getopt and optparse we now have argparse . ...
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what does the __file__ variable mean/do?

... When a module is loaded from a file in Python, __file__ is set to its path. You can then use that with other functions to find the directory that the file is located in. Taking your examples one at a time: A = os.path.join(os.path.dirname(__file__), '..') # A is...
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How Pony (ORM) does its tricks?

... Pony ORM author is here. Pony translates Python generator into SQL query in three steps: Decompiling of generator bytecode and rebuilding generator AST (abstract syntax tree) Translation of Python AST into "abstract SQL" -- universal list-based representation of a...