append和extend有什么区别?
append
extend
append:
x = [1, 2, 3] x.append([4, 5]) print (x)
输出:[1, 2, 3, [4, 5]]
[1, 2, 3, [4, 5]]
extend:
x = [1, 2, 3] x.extend([4, 5]) print (x)
输出:[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5]