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What's the canonical way to check for type in Python?
... some cases:
if issubclass(type(o), str):
See Built-in Functions in the Python Library Reference for relevant information.
One more note: in this case, if you're using Python 2, you may actually want to use:
if isinstance(o, basestring):
because this will also catch Unicode strings (unicode i...
What is the global interpreter lock (GIL) in CPython?
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Python's GIL is intended to serialize access to interpreter internals from different threads. On multi-core systems, it means that multiple threads can't effectively make use of multiple cores. (If the GIL didn't lead to this...
The modulo operation on negative numbers in Python
I've found some strange behaviour in Python regarding negative numbers:
8 Answers
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Why is it slower to iterate over a small string than a small list?
...ence is closer to 70% (or more) once a lot of the overhead is removed, for Python 2.
Object creation is not at fault. Neither method creates a new object, as one-character strings are cached.
The difference is unobvious, but is likely created from a greater number of checks on string indexing, with ...
How can I force division to be floating point? Division keeps rounding down to 0?
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In Python 2, division of two ints produces an int. In Python 3, it produces a float. We can get the new behaviour by importing from __future__.
>>> from __future__ import division
>>> a = 4
>>> b = 6
...
How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
How can I make any use of PYTHONPATH? When I try to run a script in the path the file is not
found. When I cd to the directory holding the script the script runs. So what good is the
PYTHONPATH?
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How to stop/terminate a python script from running?
...ts to tokeniza 349 text files! How can I stop it? How can I stop a running Python program?
16 Answers
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Working with UTF-8 encoding in Python source [duplicate]
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In the source header you can declare:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
....
It is described in the PEP 0263:
Then you can use UTF-8 in strings:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
u = 'idzie wąż wąską dróżką'
uu = u.decode('utf8')
s = uu.encod...
Emacs bulk indent for Python
Working with Python in Emacs if I want to add a try/except to a block of code, I often find that I am having to indent the whole block, line by line. In Emacs, how do you indent the whole block at once.
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How to declare an array in Python?
How do I declare an array in Python ?
16 Answers
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