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Efficient way to apply multiple filters to pandas DataFrame or Series
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250
Pandas (and numpy) allow for boolean indexing, which will be much more efficient:
In [11]: df....
Best practices/guidance for maintaining assembly version numbers
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data type not understood
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150
Try:
mmatrix = np.zeros((nrows, ncols))
Since the shape parameter has to be an int or sequen...
Git flow release branches and tags - with or without “v” prefix
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answered Feb 7 '14 at 23:52
TimWollaTimWolla
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Is python's sorted() function guaranteed to be stable?
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Ensuring json keys are lowercase in .NET
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How to deep copy a list?
... objects.
See the following snippet -
>>> a = [[1, 2, 3], [4, 5, 6]]
>>> b = list(a)
>>> a
[[1, 2, 3], [4, 5, 6]]
>>> b
[[1, 2, 3], [4, 5, 6]]
>>> a[0][1] = 10
>>> a
[[1, 10, 3], [4, 5, 6]]
>>> b # b changes too -> Not a deepcop...