在Python中创建同时循环 [英] Creating Simultaneous Loops in Python

问题描述

我想创建一个具有这种感觉的循环:

I want to create a loop who has this sense:

for i in xrange(0,10):
for k in xrange(0,10):
     z=k+i
     print z

where the output should be

0
2
4
6
8
10
12
14
16
18

推荐答案

您可以使用>code> zip 将多个列表(或可迭代对象)变成成对的*元组:

You can use zip to turn multiple lists (or iterables) into pairwise* tuples:

>>> for a,b in zip(xrange(10), xrange(10)):
...     print a+b
... 
0
2
4
6
8
10
12
14
16
18

但是 zip 在大集合上的缩放效果不如 izip (上面提到过). zip 的优点是它是内置的，您不必导入itertools -以及那个是否实际上是一个优势是主观的.

But zip will not scale as well as izip (that sth mentioned) on larger sets. zip's advantage is that it is a built-in and you don't have to import itertools -- and whether that is actually an advantage is subjective.

*不仅是成对的，而且是 n 的.元组的长度将与您传递给 zip 的可迭代对象的数量相同.

*Not just pairwise, but n-wise. The tuples' length will be the same as the number of iterables you pass in to zip.

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