[Python知识库]python增删改查

1、增

>>> a = [1,2,3]
>>> b = ["a","b"]
>>> a.append("Joe") #列表末尾追加
>>> a
>>> [1, 2, 3, 'Joe']
>>> a.insert(1,"c") #第1个元素插入"c"
>>> a
>>> [1, 'c', 2, 3, 'Joe']
>>> a.extend(b) #b的元素追加到a列表之后
>>> a
>>> [1, 'c', 2, 3, 'Joe', 'a', 'b']

2、删

>>> a = [1,2,3]
>>> del a[1]
>>> a
>>> [1, 3]
>>> a.pop() #删掉列表最后一个元素
>>> 3
>>> a
>>> [1]

3、改

>>> a = [1,2,3]
>>> a[2] = 10
>>> a
>>> [1,2,10]

4、查

>>> if xxx in list
>>> not in
>>> count
>>> index
>>> find