python django 自定义 装饰器

# -*-coding:utf-8-*-__author__ = "GILANG ([e-mail])""""django 自定义用于view的装饰器"""from functools import wrapsdef object_does_not_exist(func):    """    不带参数的装饰器    """    @wraps(func)    def returned_wrapper(request, *args, **kwargs):        try:            return func(request, *args, **kwargs)        except ObjectDoesNotExist:            raise Http404()    return returned_wrapper@object_does_not_existdef detail(request):    """    用法    """    pass############################################################################def object_does_not_exist(redirect=None):    """    第一种写法：带参数的装饰器    """    def decorator(func):        @wraps(func)        def returned_wrapper(request, *args, **kwargs):            try:                return func(request, *args, **kwargs)            except ObjectDoesNotExist:                if redirect:                    return HttpResponseRedirect(redirect)                else:                    raise Http404()        return returned_wrapper    return decorator@object_does_not_exist(redirect='/')def detail(request):    pass# 记得加个闭合括号，否则会出现类似 takes exactly 1 argument (0 given) 的错误@object_does_not_exist()def foo(request):    pass############################################################################def object_does_not_exist(func=None, redirect=None):    """    第二种写法：带参数的装饰器    第二种方法可以解决 got an unexpected keyword argument 错误。    """    def decorator(func):        @wraps(func)        def returned_wrapper(request, *args, **kwargs):            try:                return func(request, *args, **kwargs)            except ObjectDoesNotExist:                if redirect:                    return HttpResponseRedirect(redirect)                else:                    raise Http404()        return returned_wrapper    if not func:        def foo(func):            return decorator(func)        return foo    else:        return decorator(func)        @object_does_not_exist(redirect='/')def detail(request):    pass@object_does_not_existdef foo(request):    pass