python基础巩固_函数

可变参数

def printinfo(arg1, *args):
	 print(arg1)
	 for var in args:
		 print(var)
printinfo(10) # 10
printinfo(70, 60, 50)
# 70
# 60
# 50

关键字参数

def printinfo(arg1, *args, **kwargs):
	 print(arg1)
	 print(args)
	 print(kwargs)
printinfo(70, 60, 50, a=1, b=2)
# 70
# (60, 50)
# {'a': 1, 'b': 2}

命名关键字参数

def printinfo(arg1, *, nkw, **kwargs):
 print(arg1)
 print(nkw)
 print(kwargs)
printinfo(70, nkw=10, a=1, b=2)
# 70
# 10
# {'a': 1, 'b': 2}
printinfo(70, 10, a=1, b=2)
# TypeError: printinfo() takes 1 positional argument but 2 were given

函数作用域

num = 1
def fun1():
	 global num # 需要使⽤ global 关键字声明
	 print(num) # 1
	 num = 123
	 print(num) # 123
fun1()
print(num) # 123

def funX(x):
	 def funY(y):
			return x * y
	 return funY
i = funX(8)
print(type(i)) # 
print(i(5)) # 40

def outer():
	 num = 10
	 def inner():
		 nonlocal num # nonlocal关键字声明
		 num = 100
		 print(num)
	 inner()
	 print(num)
outer()
# 100
# 100