大约有 49,000 项符合查询结果（耗时：0.0387秒） [XML]
List comprehension rebinds names even after scope of comprehension. Is this right?
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answered Nov 16 '10 at 21:48
Steven RumbalskiSteven Rumbalski
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NameError: global name 'xrange' is not defined in Python 3
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answered Jun 19 '13 at 13:14
Martijn Pieters♦Martijn Pieters
839k212212 gold badges32183218 silver badges28092809 bronze badges
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Setting Vim whitespace preferences by filetype
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245
there are many ways, but here's a simple, easy to understand way. add these lines to your ~/.vi...
Using numpy to build an array of all combinations of two arrays
...implementation:
@pv's solution
In [113]:
%timeit cartesian(([1, 2, 3], [4, 5], [6, 7]))
10000 loops, best of 3: 135 µs per loop
In [114]:
cartesian(([1, 2, 3], [4, 5], [6, 7]))
Out[114]:
array([[1, 4, 6],
[1, 4, 7],
[1, 5, 6],
[1, 5, 7],
[2, 4, 6],
[2, 4, 7],...
Apply a function to every row of a matrix or a data frame
...:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to app...
What's the difference between lists enclosed by square brackets and parentheses in Python?
... = {}
>>> z[x] = 3
>>> z
{(1, 2): 3}
>>> z[y] = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
Note that, as many people have pointed out, you can add tuples together. For example:
>>>...
PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)
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animuson♦animuson
49.1k2323 gold badges127127 silver badges139139 bronze badges
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How to pass a single object[] to a params object[]
... Undo♦
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answered Aug 30 '08 at 21:36
Adam WrightAdam Wright
47k1111...
How to get subarray from array?
I have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
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Python's “in” set operator
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answered Jan 2 '12 at 21:14
Ignacio Vazquez-AbramsIgnacio Vazquez-Abrams
667k127127 gold badges11911191 silver badges12501250 bronze badges
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