python3中函数参数的四种简单用法

def print_two(*args):
  arg1, arg2 = args
  print "arg1: %r, arg2: %r" % (arg1,arg2)
def print_two_again(arg1, arg2):
  print "arg1: %r, arg2: %r" % (arg1, arg2)
def print_one(arg1):
  print "arg1: %r" % arg1
def print_none():
  print "I got nothin"
print_two("Zed","Shaw")
print_two_again("Zed","Shaw")
print_one("First!")
print_none()

def stu_register(name,age,country,course):
  print("----注册学生信息------")
  print("姓名:",name)
  print("age:",age)
  print("国籍:",country)
  print("课程:",course)
stu_register("王山炮",22,"CN","python_devops")
stu_register("张叫春",21,"CN","linux")
stu_register("刘老根",25,"CN","linux")

def stu_register(name,age,course,country="CN"):

stu_register(age=22,name='alex',course="python",)　　

def stu_register(name,age,*args): # *args 会把多传入的参数变成一个元组形式
  print(name,age,args)
stu_register("Alex",22)
#输出
#Alex 22 () #后面这个()就是args,只是因为没传值,所以为空
stu_register("Jack",32,"CN","Python")
#输出
# Jack 32 ('CN', 'Python')

def stu_register(name,age,*args,**kwargs): # *kwargs 会把多传入的参数变成一个dict形式
  print(name,age,args,kwargs)
stu_register("Alex",22)
#输出
#Alex 22 () {}#后面这个{}就是kwargs,只是因为没传值,所以为空
stu_register("Jack",32,"CN","Python",sex="Male",province="ShanDong")
#输出
# Jack 32 ('CN', 'Python') {'province': 'ShanDong', 'sex': 'Male'}

name = "Alex Li"
def change_name(name):
  print("before change:",name)
  name = "金角大王,一个有Tesla的男人"
  print("after change", name)
change_name(name)
print("在外面看看name改了么?",name)

before change: Alex Li
after change 金角大王,一个有Tesla的男人