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Elegant ways to support equivalence (“equality”) in Python classes
...important to allow equivalence by means of the == and != operators. In Python, this is made possible by implementing the __eq__ and __ne__ special methods, respectively. The easiest way I've found to do this is the following method:
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How do I add tab completion to the Python shell?
When starting a django application using python manage.py shell , I get an InteractiveConsole shell - I can use tab completion, etc.
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Converting int to bytes in Python 3
I was trying to build this bytes object in Python 3:
13 Answers
13
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How to redirect 'print' output to a file using python?
I want to redirect the print to a .txt file using python. I have a 'for' loop, which will 'print' the output for each of my .bam file while I want to redirect ALL these output to one file. So I tried to put
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Installing pip packages to $HOME folder
Is it possible? When installing pip , install the python packages inside my $HOME folder. (for example, I want to install mercurial , using pip , but inside $HOME instead of /usr/local )
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How do I write JSON data to a file?
...ry and not yet JSON-encoded. Write it like this for maximum compatibility (Python 2 and 3):
import json
with open('data.json', 'w') as f:
json.dump(data, f)
On a modern system (i.e. Python 3 and UTF-8 support), you can write a nicer file with
import json
with open('data.json', 'w', encoding=...
Why is IoC / DI not common in Python?
...able frameworks and Java EE. On the other hand, there are also lots of big Python web applications, but beside of Zope (which I've heard should be really horrible to code) IoC doesn't seem to be very common in the Python world. (Please name some examples if you think that I'm wrong).
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How to print a percentage value in python?
...0%}".format(1./3)
33%
If you don't want integer division, you can import Python3's division from __future__:
>>> from __future__ import division
>>> 1 / 3
0.3333333333333333
# The above 33% example would could now be written without the explicit
# float conversion:
>>>...
Thread Safety in Python's dictionary
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Python's built-in structures are thread-safe for single operations, but it can sometimes be hard to see where a statement really becomes multiple operations.
Your code should be safe. Keep in mind: a lock here will add almo...
Is python's sorted() function guaranteed to be stable?
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Isn't this what is expected in this case? Python is going to compare tuples through all elements by default, not just the first "primary" one. If you only want to sort on the first element, you can pass the key parameter explicitly.
– Matias Gri...