关于Python中函数的几种形参

def user(name, age):
	print("{} is {} years old".format(name,age)) # format()方法是寻找字符串中{}标识，然后把参数依次赋值给字符串中
user("Tom", 10)
user(10, "Tom")
# 输出
Tom is 10 years old
10 is Tom years old

def user(name, age):
	print("{} is {} years old".format(name, age))
user("Tom", 10)
user(age=10, name="Tom") # 即使实参的位置不是按照形参位置，也能匹配到相对应参数的值。
# 输出：
Tom is 10 years old
Tom is 10 years old

def users(f_name, l_name, **user_info):
	print("first name: " + f_name)
	print("last name: " + l_name)
	for arg_name, arg_value in user_info.items():
		print("{}:{}".format(arg_name, arg_value))
users("tom", "leaf", location="here", height=150, length=80 )
# 输出
first name: tom
last name: leaf
location:here
height:150
length:80

def user(name, age=12):
	print("{} is {} years old".format(name, age))
user("Tom", 10) # age参数传递了实参值，那么优先使用传递的实参值
user("Tom")
user(name="Tom")
user(age=10, name="Tom") # 两个参数都是关键字参数，那么参数位置颠倒也可以正确匹配到
# 输出：
Tom is 10 years old
Tom is 12 years old
Tom is 12 years old
Tom is 10 years old

def users(*names):
	print(str(names))
	for name in names:
		print(name)
users("tech")
users("tom", "test", "amy")
# 输出
tech
tach
('tom','tets','amy')
tom
test
amy