1.append函数
lst =[1,2,3]
lst.append(4)
lst
[1,2,3,4]
2.clear函数
lst.clear()
lst
[] 等价于lst[0:4] = lst[:] =[]
3.copy
a = [1,2,3]
b = a.copy()
b[1] =4
a
[1,4,3]
4.extend函数(该函数比 '+' 效率高)
a = [1,2,3]
b = [4,5,6]
a.extend(b)
a
[1,2,3,4,5,6]
5.index函数
knights = ['we','are','family']
knights.index('are')
1
6.insert(同extend，一样可以通过切片赋值来获得与insert一样的效果)
numbers = [1,2,3,4,5,6]
numbers.insert(3,'four')
numbers
[1,2,3,'four',5,6]
7.pop(从列表删除一个元素并返回这个元素)
x = [1,2,3]
x.pop()
3
x
[1,2]
