第二模块 3.5 函数的参数

1 位置参数， 默认参数                位置参数> 关键参数/默认参数

def register(name, age, major, country="CN"): # 默认参数，需要显示所有参数后面， 先找位置参数， 再找默认参数， 
    """
    学籍注册程序
    :param name: str
    :param age: int
    :param major: str, CS
    :param country: JP, CN, US
    :return:
    """
    info = """
    ----------------你的注册信息 -------------
    name: %s
    age:%s
    major:%s
    country:%s
    """ %(name, age, major, country)
    print(info)

register("张三",22,"CS")
register("李四",18,"Math")
register("Mike",20,"CS","US")

2  关键参数

def register(name, age, major="CS", country="CN"): # 默认参数，需要显示所有参数后面， 先找位置参数， 再找默认参数，
    """
    学籍注册程序
    :param name: str
    :param age: int
    :param major: str, CS
    :param country: JP, CN, US
    :return:
    """
    info = """
    ----------------你的注册信息 -------------
    name: %s
    age:%s
    major:%s
    country:%s
    """ %(name, age, major, country)
    print(info)

register(age=22,name = "alex")   #关键参数，位置参数在前， 关键参数在后

3  非固定参数    在定义函数时， 不确定后面调用时， 会传递多少个参数进来

def register(name, age, major="CS", country="CN",*args, **kwagrgs): # 额外传输进来的非固定参数
    """
    学籍注册程序
    :param name: str
    :param age: int
    :param major: str, CS
    :param country: JP, CN, US
    :return:
    """
    info = """
    ----------------你的注册信息 -------------
    name: %s
    age:%s
    major:%s
    country:%s
    """ %(name, age, major, country)
    print(info)
    print(args, kwagrgs.get("addr"))

register(age=22,name = "alex",sex = "M", phone = 13012345564)   #关键参数，位置参数在前， 关键参数在后
register(age=22,name = "jack",sex = "M", addr = "沙河")
register("Mike",20,"CS","US")

def register(name, *args,**kwargs):
    print(name, args,kwargs)

register("Alex",22, "Math", sex = "M")

打印结果是： 

Alex (22, 'Math') {'sex': 'M'}

本小结练习题答案：

def register(name, age, hobbie,sex = "M",):

    info = """
    -------------info------------
    Name:%s
    Age: %s
    Sex: %s
    Hobbie: %s
    """ %(name, age, sex, hobbie)
    print(info)
register(name="Alex", age=22, hobbie= "大保健")
register(name="Jack", age=26, hobbie= "学习")