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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...
Changing default encoding of Python?
I have many "can't encode" and "can't decode" problems with Python when I run my applications from the console. But in the Eclipse PyDev IDE, the default character encoding is set to UTF-8 , and I'm fine.
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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 ...
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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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 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
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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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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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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 -*-
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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...