Python将一个变量中的多个列表合并为一个列表

你可以用itertools.chain.

In [35]: from itertools import chain

In [36]: a = ['1'], ['3'], ['3']

In [37]: list(chain(*a))
Out[37]: ['1', '3', '3']

要么

In [39]: list(chain.from_iterable(a))
Out[39]: ['1', '3', '3']