元组类型的内置方法

• 1.用途

​ 可以存多个数据

• 2.定义

​ （）内可以有多个任意类型的值，用逗号隔开，元组是不可变的列表

name_tuple=('jack','alex','peiqi')
name_tuple[0]='nick'    #元素不能修改，会报错

• 3.常用操作很内置方法

​ 1.按索引取值

name_tuple = ('nick', 'jason', 'tank', 'sean')
# name_tuple[0] = 'nick handsom'  # 报错

print(f"name_tuple[0]: {name_tuple[0]}")
#name_tuple[0]: nick

​ 2.切片（顾头不顾尾，步长）

name_tuple = ('nick', 'jason', 'tank', 'sean')

print(f"name_tuple[1:3:2]: {name_tuple[1:3:2]}")
#name_tuple[1:3:2]: ('jason',)

​ 3.长度len

name_tuple = ('nick', 'jason', 'tank', 'sean')
print(len(name_tuple))      #4

​ 4.成员运算 in 和not in

name_tuple = ('nick', 'jason', 'tank', 'sean')

print(f"'nick' in name_tuple: {'nick' in name_tuple}")
#True

​ 5.循环

name_tuple = ('nick', 'jason', 'tank', 'sean')

for name in name_tuple:
    print(name)
    
nick
jason
tank
sean

​ 6.count

name_tuple = ('nick', 'jason', 'tank', 'sean')

print(f"name_tuple.count('nick'): {name_tuple.count('nick')}")
#1

​ 7.index

name_tuple = ('nick', 'jason', 'tank', 'sean')

print(f"name_tuple.index('nick'): {name_tuple.index('nick')}")
#0

• 4.存一个值或多个值

​ 多个值

• 5.有序或无序

  有序

• 6.可变or不可变

​ 不可变数据类型