列表方法有什么区别append()
and extend()
?
.append() https://docs.python.org/3/library/stdtypes.html#mutable-sequence-types将指定的对象追加到列表末尾:
>>> x = [1, 2, 3]
>>> x.append([4, 5])
>>> print(x)
[1, 2, 3, [4, 5]]
.extend() https://docs.python.org/3/library/stdtypes.html#mutable-sequence-types通过附加指定迭代中的元素来扩展列表:
>>> x = [1, 2, 3]
>>> x.extend([4, 5])
>>> print(x)
[1, 2, 3, 4, 5]
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