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What's a standard way to do a no-op in python?
I often find myself writing if / elif / else constructs in python, and I want to include options which can occur, but for which the corresponding action is to do nothing. I realise I could just exclude those if statements, but for readability I find it helps to include them all, so that if you are l...
Python dictionary: Get list of values for list of keys
...emgetter(*mykeys)(mydict)
# use `list(...)` if list is required
Note: in Python3, map returns an iterator rather than a list. Use list(map(...)) for a list.
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What does |= (ior) do in Python?
... # `s1` is reassigned
{'a', 'b', 'c', 'd', 'e', 'f'}
Dictionaries
In Python 3.9+, new merge (|) and update (|=) operators are proposed between dictionaries. Note: these are not the same as set operators mentioned above.
Given operations between two assigned dicts d1 and d2:
>>> d1 = d...
Convert to binary and keep leading zeros in Python
I'm trying to convert an integer to binary using the bin() function in Python. However, it always removes the leading zeros, which I actually need, such that the result is always 8-bit:
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Traverse a list in reverse order in Python
... This is slightly slower than using reversed, at least under Python 2.7 (tested).
– kgriffs
Jan 2 '14 at 16:49
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Redirect all output to file [duplicate]
I know that in Linux, to redirect output from the screen to a file, I can either use the > or tee . However, I'm not sure why part of the output is still output to the screen and not written to the file.
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Python's “in” set operator
I'm a little confused about the python in operator for sets.
5 Answers
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How to print a dictionary's key?
I would like to print a specific Python dictionary key:
20 Answers
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The order of keys in dictionaries
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You could use OrderedDict (requires Python 2.7) or higher.
Also, note that OrderedDict({'a': 1, 'b':2, 'c':3}) won't work since the dict you create with {...} has already forgotten the order of the elements. Instead, you want to use OrderedDict([('a', 1), ('b'...
Sorting dictionary keys in python [duplicate]
...815423426 you edited my post s/list/my_list/ because "list is a keyword in python". Your edit is fine, but list is not a keyword (c.f. docs.python.org/3/reference/lexical_analysis.html#keywords), so my program fragment would (bytecode-)compile and run. It is however a name in the __builtins__ name...