Python 中追加与扩展列表方法之间的区别

Question

What's the difference between the list methods append() and extend()?

转载于:https://stackoverflow.com/questions/252703/difference-between-append-vs-extend-list-methods-in-python

Answer 1

append: Appends object at the end.

x = [1, 2, 3]
x.append([4, 5])
print (x)

gives you: [1, 2, 3, [4, 5]]

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extend: Extends list by appending elements from the iterable.

x = [1, 2, 3]
x.extend([4, 5])
print (x)

gives you: [1, 2, 3, 4, 5]