切片的赋值操作
作用:
可以改变原列表的排列,可以插入,和修改数据
语法:
列表[切片] = 可迭代对象
说明:
切片赋值的赋值运算符(=)的右侧必须是一个可迭代对象
示例:
L = [2, 3, 4]
L[0:1] = [1.1, 2.2] # L=[1.1, 2.2, 3, 4]
L[0:2] = [2] # L = [2, 3, 4]
L[1:2] = [3.1, 3.2] # L = [2, 3.1, 3.2, 4]
L = [2, 3, 4]
L[1:1] = [2.1, 2.2] # L = [2, 2.1, 2.2, 3, 4]
L[0:0] = [0, 1] # L = [0, 1, 2, 2.1 ....]
L = [2, 3, 4]
L[3:3] = [5, 6] # L = [2, 3, 4, 5, 6]
L = [2, 3, 4]
L[1:2] = "AB" # L = [2, 'A', 'B', 4]
L[1:3] = range(7, 10) # L = [2, 7, 8, 9, 4]
切片的注意事项:
对于步长不等于1的切片赋值,赋值运算符的右侧的可迭代对象
提供的元素的个数,一定要等于切片切出的段数
L = [1, 2, 3, 4, 5, 6]
L[::2] = "ABC" # 对的
L[::2] = "abcd" # 错的
