如何在python中创建许多空的嵌套列表

如何在python中创建许多空的嵌套列表

尝试列表理解：

lst = [[] for _ in xrange(a)]

见下文：

>>> a = 3>>> lst = [[] for _ in xrange(a)]>>> lst[[], [], []]>>> a = 10>>> lst = [[] for _ in xrange(a)]>>> lst[[], [], [], [], [], [], [], [], [], []]>>> # This is to prove that each of the lists in lst is unique>>> lst[0].append(1)>>> lst[[1], [], [], [], [], [], [], [], [], []]>>>

但是请注意，以上内容适用于Python2.x。在Python 3.x.上，由于

xrange

已被删除，因此您需要：

lst = [[] for _ in range(a)]