"del"、"remove"和"pop"在列表中的区别
"del"、"remove"和"pop"在列表中的区别
这三种方法从列表中删除元素有什么区别吗?
>>> a = [1, 2, 3] >>> a.remove(2) >>> a [1, 3] >>> a = [1, 2, 3] >>> del a[1] >>> a [1, 3] >>> a = [1, 2, 3] >>> a.pop(1) 2 >>> a [1, 3]
admin 更改状态以发布 2023年5月25日
从列表中删除元素的三种不同方法的效果:
remove
方法删除第一个匹配的值,而不是特定的索引:
>>> a = [0, 2, 3, 2] >>> a.remove(2) >>> a [0, 3, 2]
del
方法删除指定索引处的元素:
>>> a = [9, 8, 7, 6] >>> del a[1] >>> a [9, 7, 6]
pop
方法删除指定索引处的元素并返回它。
>>> a = [4, 3, 5] >>> a.pop(1) 3 >>> a [4, 5]
它们的错误模式也不同:
>>> a = [4, 5, 6] >>> a.remove(7) Traceback (most recent call last): File "", line 1, in ValueError: list.remove(x): x not in list >>> del a[7] Traceback (most recent call last): File " ", line 1, in IndexError: list assignment index out of range >>> a.pop(7) Traceback (most recent call last): File " ", line 1, in IndexError: pop index out of range