python删除list中元素的三种方法

1. a.pop(index):删除列表a中index处的值,并且返回这个值.
2. del(a[index]):删除列表a中index处的值,无返回值. del中的index可以是切片,所以可以实现批量删除.
3. a.remove(value):删除列表a中第一个等于value的值,无返回.

>>> a = [0, 2, 3, 2]
>>> a.remove(2)
>>> a
[0, 3, 2]

>>> a = [3, 2, 2, 1]
>>> del a[1]
>>> a
[3, 2, 1]

>>> a = [4, 3, 5]
>>> a.pop(1)
3
>>> a
[4, 5]

#错误信息也不一样
>>> a = [4, 5, 6]
>>> a.remove(7)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: list.remove(x): x not in list
>>> del a[7]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range
>>> a.pop(7)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: pop index out of range