装饰器

基础应用

def warpDemo(func):
    def wrapper(*args,**kwargs):
        print('1')
        result = func(*args,**kwargs)
        return result
    return wrapper

@warpDemo
def main(msg:str):
    print('main')
    return 'success'
if __name__ == '__main__':
    print(main('msg'))

装饰器应用

from functools import wraps


def wrapexp(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        print('this is a wrapper')
        func(*args, **kwargs)
    return wrapper
@wrapexp
def exp(a,b,c=3,d=4):
    #print(1)
    print(a,b,c,d)

args=[1,2]
dt={'c':4,'d':5}
exp(*args,**dt)

基于用户签权

https://www.zhihu.com/question/54035516

from functools import wraps


def permission(permit_users):
    def login_acquired(func):
        @wraps(func)
        def inner():
            print(len(permit_users))
            if len(permit_users)==3:
                print('ab')
                return False;
            return func()

        return inner

    return login_acquired

@permission(["ethan", "john", "jack"])
def index():
    return "success"
if __name__ == '__main__':
    print(index())