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What is AF_INET, and why do I need it?
...tion. AF stands for Address Family.
As in BSD standard Socket (adopted in Python socket module) addresses are represented as follows:
A single string is used for the AF_UNIX/AF_LOCAL address family. This option is used for IPC on local machines where no IP address is required.
A pair (host, port)...
Combining node.js and Python
...b project, but there are few computational tasks for which we would prefer Python. We also already have a Python code for them.
We are highly concerned about speed, what is the most elegant way how to call a Python "worker" from node.js in an asynchronous non-blocking way?
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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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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...
Working with UTF-8 encoding in Python source [duplicate]
...
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...
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
8
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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
...
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 ...
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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