# 使用list和tuple

# list

# 创一个list

classmates =['xka','sas','sxa','asd']

print(len(classmates))

# insert 把元素插入到指定索引位置

classmates.insert(1,'hhhhh')

print(classmates)

# pop 删除末尾元素

classmates.pop()

print(classmates)

# pop(i) 删除指定索引的元素

classmates.pop(2)

print(classmates)

#classmates[1] ='xxxx' 将指定索引元素替换

classmates[1] ='lalalal'

print(classmates)

# tuple

classmates = ('Michael', 'Bob', 'Tracy')

#classmates[0] 可以正常读写 但不能赋值

#tuple 具有不可变性 是代码更加安全

#练习

# -*- coding: utf-8 -*-

L = [

    ['Apple', 'Google', 'Microsoft'],

    ['Java', 'Python', 'Ruby', 'PHP'],

    ['Adam', 'Bart', 'Lisa']

]

# 打印Apple:

print(L[0][0])

# 打印Python:

print(L[1][1])

# 打印Lisa:

print(L[2][2])