Python-在函数和它的装饰器之间共享变量

时间:2014-03-03 01:54:14

标签: python python-2.7 decorator python-decorators

(Python 2.7)由于装饰者不能与他们正在装饰的函数共享变量,我如何将object_list传递给装饰函数?我有一些将使用raw_turn_over_mailer()装饰器的函数,如果可能的话,我想将object_list保留到本地修饰函数中。

def raw_turn_over_mailer(function):
    @wraps(function)
    def wrapper(requests):
        original_function = function(requests)
        if object_list:
            ....
        return original_function
     return wrapper


@raw_turn_over_mailer
def one(requests):
    object_list = [x for x in requests
            if x.account_type.name == 'AccountType1']
@raw_turn_over_mailer
def two(requests):
    object_list = [x for x in requests
            if x.account_type.name == 'AccountType2']

@periodic_task(run_every=crontab(hour="*", minute="*", day_of_week="*"))
def turn_over_mailer():
    HOURS = 1000
    requests = Request.objects.filter(completed=False, date_due__gte=hours_ahead(0), date_due__lte=hours_ahead(HOURS))
    if requests:
        one(requests)
        two(requests)

1 个答案:

答案 0 :(得分:1)

我实际上无法运行它,但我认为它会做你想要的,它创建一个wrapper()函数调用原始函数(现在只返回一个对象列表),然后对它进行后处理(但本身不返回):

from functools import wraps

def raw_turn_over_mailer(function):
    @wraps(function)
    def wrapper(requests):
        object_list = function(requests)  # call original
        if object_list:
            #....
    return wrapper

@raw_turn_over_mailer
def one(requests):
    return [x for x in requests if x.account_type.name == 'AccountType1']

@raw_turn_over_mailer
def two(requests):
    return [x for x in requests if x.account_type.name == 'AccountType2']

这似乎是一种处理调用函数结果的复杂方法。您可以调用后处理函数并将其传递给函数以调用以获取对象列表。