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return, return None, and no return at all?
... code will probably need to handle both types of return values).
Often in Python, functions which return None are used like void functions in C -- Their purpose is generally to operate on the input arguments in place (unless you're using global data (shudders)). Returning None usually makes it mor...
Extract part of a regex match
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Use ( ) in regexp and group(1) in python to retrieve the captured string (re.search will return None if it doesn't find the result, so don't use group() directly):
title_search = re.search('<title>(.*)</title>', html, re.IGNORECASE)
if title_sea...
Tags for Emacs: Relationship between etags, ebrowse, cscope, GNU Global and exuberant ctags
... answered Feb 24 '13 at 20:42
Clément B.Clément B.
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Formatting floats without trailing zeros
... @alexanderlukanin13 because the default precision is 6, see docs.python.org/2/library/string.html: 'f' Fixed point. Displays the number as a fixed-point number. The default precision is 6. You would have to use '%0.7f' in the above solution.
– derenio
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How to frame two for loops in list comprehension python
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Convert absolute path into relative path given a current directory using Bash
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$ python -c "import os.path; print os.path.relpath('/foo/bar', '/foo/baz/foo')"
gives:
../../bar
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Why do you need to put #!/bin/bash at the beginning of a script file?
... most systems run bash, the "Bourne Again Shell"), scripts can be in bash, python, perl, ruby, PHP, etc, etc. For example, you might see #!/bin/perl or #!/bin/perl5.
PS:
The exclamation mark (!) is affectionately called "bang". The shell comment symbol (#) is sometimes called "hash".
PPS:
Rememb...
Is there still any reason to learn AWK?
... the best tool for the job... and now even though his students like me use python and what not, he sticks to what he knows and works well.
In closing, there is a lot of old code kicking around the world, knowing a little awk isn't going to hurt. It will also make you better *nix person :-)
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Is there a list of Pytz Timezones?
... to know what are all the possible values for the timezone argument in the Python library pytz. How to do it?
7 Answers
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django syncdb and an updated model
...e recently updated my model, added a BooleanField to it however when I do python manage.py syncdb , it doesn't add the new field to the database for the model. How can I fix this ?
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