print("-------1、反向迭代 ----")

list1 = [1,2,3,4,5]
for num1 in list1 :
    print ( num1 , end = ' ' )

print()

list1 = [1,2,3,4,5]
for num1 in reversed(list1) :
    print ( num1 , end = ' ' )

print()

# -*- coding: UTF-8 -*-

class Countdown:
    def __init__(self, start):
        self.start = start

    def __iter__(self):
        # Forward iterator
        n = self.start
        while n > 0:
            yield n
            n -= 1

    def __reversed__(self):
        # Reverse iterator
        n = 1
        while n <= self.start:
            yield n
            n += 1

for rr in reversed(Countdown(30)):
    print(rr)
for rr in Countdown(30):
    print(rr)


print("-------2、同时迭代多个序列----")

# -*- coding: UTF-8 -*-

names = ['laingdianshui', 'twowater', '两点水']
ages = [18, 19, 20]
for name, age in zip(names, ages):
     print(name,age)


# -*- coding: UTF-8 -*-

names = ['laingdianshui', 'twowater', '两点水']
ages = [18, 19, 20]

dict1= dict(zip(names,ages))

print(dict1)