8.3返回值

#接受名和姓并返回整洁的姓名


def get_formatted_name(first_name,last_name):

    """返回整洁的姓名"""

    full_name=first_name+‘ ‘+last_name
    return full_name.title()

mussician=get_formatted_name("jimi","hendrix")
print(mussician)



>>> 
==================== RESTART: D:/python学习/第8章 函数/8.3.1.py ====================
Jimi Hendrix
>>> 

#接受名、中间名和姓并返回整洁的姓名


def get_formatted_name(first_name,middle_name,last_name):

    """返回整洁的姓名"""

    full_name=first_name+‘ ‘+middle_name+‘ ‘+last_name
    return full_name.title()

mussician=get_formatted_name("join","lee","hooker")
print(mussician)



>>> 
==================== RESTART: D:/python学习/第8章 函数/8.3.2.py ====================
Join Lee Hooker
>>> 

#接受名、中间名和姓并返回整洁的姓名
"""
如果中间名变成可选，可给实参middle_name指定一个默认值（空字符串），
并将其移到形参列表的末尾，在调用函数时若没有提供中间名则使用默认值。
"""
def get_formatted_name(first_name,last_name,middle_name=‘   ‘):

    """返回整洁的姓名"""

    full_name=first_name+‘ ‘+middle_name+‘ ‘+last_name
    return full_name.title()

#不提供中间名
mussician=get_formatted_name("join","hooker")
print(mussician)


#提供中间名
mussician=get_formatted_name("join","lee","hooker")
print(mussician)


>>> 
=================== RESTART: D:/python学习/第8章 函数/8.3.2l.py ===================
Join     Hooker
Join Hooker Lee
>>> 

def build_person(first_name,last_name):
    """返回一个字典，其中包含有关一个人的信息"""
    person={"first":first_name,"last":last_name}
    return person

musician=build_person("jimi","hendrix")
print(musician)


>>> 
==================== RESTART: D:/python学习/第8章 函数/8.3.3.py ====================
{‘last‘: ‘hendrix‘, ‘first‘: ‘jimi‘}
>>> 

#可以增加可选形参（age=" "）
def build_person(first_name,last_name,age=""):
    """返回一个字典，其中包含有关一个人的信息"""
    person={"first":first_name,"last":last_name}
    if age:
        person[‘age‘]=age
    return person


#有可选形参age
musician=build_person("jimi","hendrix",age=27)
print(musician)
print()

#无可选形参age
musician=build_person("jimi","hendrix")
print(musician)


>>> 
=================== RESTART: D:/python学习/第8章 函数/8.3.3l.py ===================
{‘last‘: ‘hendrix‘, ‘first‘: ‘jimi‘, ‘age‘: 27}

{‘last‘: ‘hendrix‘, ‘first‘: ‘jimi‘}
>>> 

#结合使用while循环，以更正规的方式问候用户


def get_formatted_name(first_name,last_name):

    """返回整洁的姓名"""

    full_name=first_name+‘ ‘+last_name
    return full_name.title()


#这个一个无限循环！
while True:
    print("\nPlease tell me you name:")
    f_name=input("First name:")

   #如果输入q退出循环 
    if f_name=="q":
        break

    #如果输入q退出循环 
    l_name=input("Last name:")
    if l_name=="q":
        break

    format_name=get_formatted_name(f_name,l_name)
    print("\nHello,"+format_name+"!")



运行结果：

>>> 
==================== RESTART: D:/python学习/第8章 函数/8.3.4.py ====================

Please tell me you name:
First name:zhang
Last name:san

Hello,Zhang San!

Please tell me you name:
First name:li
Last name:si

Hello,Li Si!

Please tell me you name:
First name:wang
Last name:q
>>>