使用list和tuple

'create a list '
classmates = ['Jo','Joo','Jooo']

print(len(classmates))

print(classmates[0])
print(classmates[1])
print(classmates[2])
# print(classmates[4]) #越界取值会报错

print(classmates[-1])
print(classmates[-2])
print(classmates[-3])

classmates.append('Joooo')
print(classmates)

classmates.insert(1,'Jo1')
print(classmates)

classmates.pop() #删除最后一个元素
print(classmates)

classmates.pop(1)#删除序号为1的元浸塑
print(classmates)

classmates[1] = 'Jo1'#修改序号为1的元素为Jo1

print(classmates)

classmates = ('Jo1','Jo2','Jo3','Jo4')
print(type(classmates))
print(classmates)
'定义一个空tuple'
tuple_0 = ()
print(type(tuple_0))#<class 'tuple'>

tuple_1 = (1)
print(type(tuple_1))#<class 'int'>

tuple_11 = (1,)
print(type(tuple_11))#<class 'tuple'>


tuple_conxp = (1,2,['A','B'])
print(tuple_conxp[2])
tuple_conxp[2][0] = 'X'
tuple_conxp[2][1] = 'Y'
print(tuple_conxp[2][0])
print(tuple_conxp[2][1])
print(tuple_conxp[2])


L = [
    ['Apple','Google','Microsoft'],
    ['Java','Python','Ruby','PHP'],
    ['Adam','Bart','Lisa']
]
print(L[0][0])  #Apple
print(L[1][1]) #Python
print(L[2][2]) #Lisa