Python -- 闭包

概念

　　返回内部函数，而且内部函数和外部函数的局部变量绑定在一起

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实例1

def make_adder(addend):
    def adder(augend):
        return augend + addend
    return adder

p = make_adder(23)
q = make_adder(44)

print p(100)
print q(100)

实例2

def hellocounter (name):
    count=0 
    def counter():
        nonlocal count
        count+=1
        print("Hello, %s, %d access!" % (name, count))
    return counter

hello = hellocounter('zoro')
hello()
hello()
hello()  

实例3

def makebold(fn):
    def wrapped():
        return "<b>" + fn() + "</b>"
    return wrapped

def makeitalic(fn):
    def wrapped():
        return "<i>" + fn() + "</i>"
    return wrapped

@makebold
@makeitalic
def hello():
    return "hello world"

print(hello())