函数定义与调用
def PrintMsg():
print("Hello world!")
函数编写规范
def print_msg():
print("hello world!")
print_msg()
文档字符串
def print_msg():
"""
This is a function !
print hello world!
"""
print("hello world!")
print_msg()
print(print_msg.__doc__)
函数注释
#function
def print_msg(x:"这是一个数字"=0,y:"这是第二个数字"=0):
"""
This is a function !
print hello world!
"""
print("hello world!")
print("x + y = {0} ".format(x+y))
print(dir(print_msg))
print(print_msg.__doc__)
print_msg(1,3)
print(print_msg.__annotations__)
hello world!
x + y = 4
{'x': '这是一个数字', 'y': '这是第二个数字'}
函数参数
位置参数
def print_mes(name,age):
print("Your name is {0},Your age is {1}".format(name,age))
print_mes("zhangsan",29)
def print_mes(name,age):
print("Your name is {0},Your age is {1}".format(name,age))
print_mes(age=29,name="zhangsan")
age=29
name="zhangsan"
def print_mes(name,age):
print("Your name is {0},Your age is {1}".format(name,age))
print_mes(name,age)
默认参数
def print_mes(name,age=0):
print("Your name is {0},Your age is {1}".format(name,age))
print_mes("zhangsan")
关键字参数
def print_mes(*test,**kw):
print(test)
print(kw)
print_mes("zhangsan","lisi","123",a=123,b=234,c=345)
('zhangsan', 'lisi', '123')
{'a': 123, 'b': 234, 'c': 345}`
练习
scores = {"zhangsan":99,"lisi":89}
def select(name):
if name in scores.keys():
print("正在查询成绩--> {0}".format(name))
print("{0}的成绩是:{1}".format(name,scores[name]))
else:
print("{0}的成绩还未整理".format(name))
select("lisi")