大约有 47,000 项符合查询结果（耗时：0.0628秒） [XML]
How do you know what to test when writing unit tests? [closed]
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A weighted version of random.choice
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Since version 1.7.0, NumPy has a choice function that supports probability distributions.
from...
How do write IF ELSE statement in a MySQL query
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You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case wh...
Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0
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14 Answers
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Sort a list by multiple attributes?
... can be a function that returns a tuple:
s = sorted(s, key = lambda x: (x[1], x[2]))
Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use sort instead of...
Why is January month 0 in Java Calendar?
In java.util.Calendar , January is defined as month 0, not month 1. Is there any specific reason to that ?
16 Answers
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How to count the number of true elements in a NumPy bool array
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>>> import numpy as np
>>> boolarr = np.array([[0, 0, 1], [1, 0, 1], [1, 0, 1]], dtype=np.bool)
>>> boolarr
array([[False, False, True],
[ True, False, True],
[ True, False, True]], dtype=bool)
>>> np.sum(boolarr)
5
Of course, that is a bool...
How to catch integer(0)?
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That is R's way of printing a zero length vector (an integer one), so you could test for a bei...
Why does parseInt(1/0, 19) return 18?
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The result of 1/0 is Infinity.
parseInt treats its first argument as a string which means fi...