Python 参数装饰器

import functools


# 第一种
##################################################
def require_permission(permissions):
    def decorated(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            has_permissions = permissions
            if has_permissions:
                return func(*args, **kwargs)
            else:
                print(403)

        return wrapper

    return decorated


@require_permission(True)
def foo():
    print('foo')


@require_permission(False)
def foo():
    print('foo')




# 第二种
#####################################################################
class require_permissions(object):
    def __init__(self, permissions):
        self.permissions = permissions

    def __call__(self, fn):
        @functools.wraps(fn)
        def decorated(*args, **kwargs):

            has_permissions = self.permissions

            if has_permissions:
                return fn(*args, **kwargs)
            else:
                print(403)

        return decorated


def require_permission(permission):
    return require_permissions(permission)


@require_permission(True)
def foo1():
    print('foo')


if __name__ == '__main__':
    foo()
    foo1()