为元组的每个元素命名，提高程序的可读性
student = ('Tom',16,'man','[email protected]')
# F1 类似于C里面定义常量，用常量代替索引
NAME,AGE,SEX,EMAIL = range(4)
print(student[NAME])
#F2 利用collections类
from collections import namedtuple
Student = namedtuple('Student',['name','age','sex','email'])
s=Student('Tom2',16,'man','[email protected]')
print(s)
print(isinstance(s,tuple))