python基础学习3_if_for

发布时间：2019-09-24 08:24:40编辑：auto阅读（2177）

    if用于条件判断，如果满足条件就执行否则就继续直到结束，熟悉shell条件判断就觉得so easy

    格式：

    if condition1:

      execute command

    elif condition2:

      execute command

    else:

      execute command


    for n in condition:

      execute command


    if示例1：     #基于windows版 python3.5

    #!/usr/bin/env pyhon
    # -*- coding: UTF-8 -*-
    # authors: jack

    age = 28
    guess_num = int(input("INPUT YOUR GUESS NUM:"))
    if guess_num == age:
        print("Your guess right.GOOD!!!")
    elif guess_num > age:
        print("Your guess letter!")
    else:
        print("Your guess smaller!")

    if示例2：

    #!/usr/bin/env pyhon
    # -*- coding: UTF-8 -*-
    # authors: jack

    user = 'jack'
    passwd = 'jack123'

    username = input("username:")
    password = input("password:")

    if user == username and password == passwd:
        print ("username is correct...,login success!!!")
    else:
         print("Invaild username or password error...")

    for示例1：
    #!/usr/bin/env pyhon
    # -*- coding: UTF-8 -*-
    # authors: jack

    age = 28
    for n in range(10):
        if n < 3:
            guess_num = int(input("INPUT YOUR GUESS NUM:"))
            if guess_num == age:
                print("Your guess right.GOOD!!!")
                break              #跳出整个loop
            elif guess_num > age:
                print("Your guess letter!")
            else:
                print("Your guess smaller!")
        else:
            print("too many attempts ...bye bye")
            break



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