zip in python

最新推荐文章于 2025-01-07 17:55:04 发布

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最新推荐文章于 2025-01-07 17:55:04 发布

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本文详细介绍了Python中zip函数的功能及用法，包括如何使用zip处理多个可迭代对象，将其组合为元组列表，以及如何利用zip和*运算符来解压这样的元组列表。此外，还提供了一些实用的例子来帮助读者更好地掌握zip函数的应用。

zip ( [ iterable, ... ] )

This function returns a list of tuples, where the i-th tuple contains the i-th element from each of the argument sequences or iterables. The returned list is truncated in length to the length of the shortest argument sequence. When there are multiple arguments which are all of the same length, zip() is similar to map() with an initial argument of None. With a single sequence argument, it returns a list of 1-tuples. With no arguments, it returns an empty list.

The left-to-right evaluation order of the iterables is guaranteed. This makes possible an idiom for clustering a data series into n-length groups using zip(*[iter(s)]*n).

zip() in conjunction with the * operator can be used to unzip a list:

   >>> 
   >>> x = [1, 2, 3]
>>> y = [4, 5, 6]
>>> zipped = zip(x, y)
>>> zipped
[(1, 4), (2, 5), (3, 6)]
>>> x2, y2 = zip(*zipped)
>>> x == list(x2) and y == list(y2)
True 
  