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  • Python-流程控制之循环

    # 1. while循环:条件循环
    # I:基本语法
    # while 条件:
    # 代码1
    # 代码2
    # 代码3
    # ...

    # 示范
    # name_of_bk='huangdong'
    # paw_of_bk='123'
    #
    # tag=True
    # while tag:
    # inp_name=input('your name>>:')
    # inp_pwd=input('your password>>:')
    # if inp_name == name_of_bk and inp_pwd == paw_of_bk:
    # print('login successful')
    # tag=False
    # else:
    # print('username or password error')
    #
    # print('emmmmmm')

    # II: while+break:break代表结束本层循环
    # 示范:
    # while True:
    # print(1)
    # break
    # print(2)
    # print(3)

    # name_of_bk='huangdong'
    # paw_of_bk='123'
    #
    # while True:
    # inp_name=input('your name>>:')
    # inp_pwd=input('your password>>:')
    # if inp_name == name_of_bk and inp_pwd == paw_of_bk:
    # print('login successful')
    # break
    # else:
    # print('username or password error')
    #
    # print('emmmmmm')

    # III: while + continue: continue代表结束本次循环,直接进入下一次
    # 示范
    # count=1
    # while count <6:
    # if count == 3:
    # count+=1
    # continue
    # print(count)
    # count+1

    # 输错三次退出
    # name_of_bk='huangdong'
    # paw_of_bk='123'
    #
    # count=0
    # while True:
    # if count == 3:
    # print('输错次数过多..')
    # break
    # inp_name=input('your name>>:')
    # inp_pwd=input('your password>>:')
    # if inp_name == name_of_bk and inp_pwd == paw_of_bk:
    # print('login successful')
    # break
    # else:
    # print('username or password error')
    # count+=1 #count=3 输错3次
    #
    #
    # print('emmmmmm')

    # IV:while + else
    # count=0
    # while True:
    # if count == 10:
    # break
    # print(count)
    # count+=1
    # else:
    # print('else的子代码块只有在while循坏没有被break打断的情况下才会执行')

    # count=0
    # while count <= 10:
    # print(count)
    # count+=1
    #
    # else:
    # print('else的子代码块只有在while循坏没有被break打断的情况下才会执行')


    name_of_bk='huangdong'
    pwd_of_bk='123'
    count=0
    tag=True
    while tag:
    if count == 3:
    print('输错次数过多...')
    break
    inp_name=input('your name>>:')
    inp_paw=input('your password>>:')
    if inp_name == name_of_bk and inp_paw == inp_paw:
    print('login password')
    while tag:
    print('''
    0 退出
    1 购物
    2 支付
    3 查看购物车
    ''')
    cmd=input('>>:')
    if cmd == '0':
    tag=False
    continue
    if cmd == '1':
    print('购物...')
    elif cmd =='2':
    print('支付..')
    elif cmd == '3':
    print('购物车')
    else:
    print('输入错误的指令')

    else:
    print('username or password error')
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  • 原文地址:https://www.cnblogs.com/huangdong-/p/9989643.html
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