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023函数def

023函数def

作者: Nzkalhbxx | 来源:发表于2017-10-29 21:50 被阅读0次
    # __author__:Nzkalhbxx
    # __date__:17-10-29
    import time
    # 函数的定义:
    """
    def functionName(形参1, 形参2...):
        函数体...
    """
    
    def eatApple():
        time_format = "%Y-%m-%d  %X"
        time_current = time.strftime(time_format)
        print("you should eat %s %s at %s"%("apple", 3, time_current))
    def eatBanana():
        time_format = "%Y-%m-%d  %X"
        time_current = time.strftime(time_format)
        print("you should eat %s %s at %s"%("Banana", 7, time_current))
    def eat_passion_fruit():
        time_format = "%Y-%m-%d  %X"
        time_current = time.strftime(time_format)
        print("you should eat %s %s at %s"%("passion_fruit", 11, time_current))
    
    eatApple()
    eatBanana()
    eat_passion_fruit()
    
    print("使用参数".center(33, "-"))
    def eat(fruit, num, name=""):
        time_format = "%Y-%m-%d  %X"
        time_current = time.strftime(time_format)
        if name != "":
            print(name, end=", ")
        print("you should eat %s %d at %s" % (fruit, num, time_current))
    
    # 只有当形参有默认值时可以缺省, 否则eat() missing 1 required positional argument: 'name'
    eat("apple", 7)
    # 当一个实参使用key = value传递参数时顺序可以随意, 但未使用k-v的参数必须写在前面
    eat("banana", name="", num=3)
    # 当不使用key = value时, 参数顺序必须一一对应
    eat("passion_fruit", 7, "psj")
    # eat("passion_fruit", "psj", 19)     # TypeError: %d format: a number is required, not str
    
    
    运行结果

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