Passing a python class constant to a decorator without self

Question

I'm using the python ratelimit library and it uses a decorator to handle rate limiting of a function. I have a class constant I'd like to pass into the decorator but of course self wont work.

Is there a way to reference the UNIVERSALIS_MAX_CALLS_PER_SECOND constant within the decorator? Or, is there a clean, more appropriate way I should handle this?

Edit: I'm seeking to avoid globals. What I was hoping for was some python introspection maybe?

class Universalis():
    # FIXME: hard-coded North America
    API_ENDPOINT = "http://universalis.app/api/v2/North-America/"
    UNIVERSALIS_MAX_CALLS_PER_SECOND = 13 # 25 max
    UNIVERSALIS_MAX_CONNECTIONS = 6 # 8 max
    LISTINGS_PER_API_CALL = 500 # Universalis no max.

    @sleep_and_retry
    @limits(calls=self.UNIVERSALIS_MAX_CALLS_PER_SECOND, period=1)
    def fetch_and_process_item_listings(self, item_ids_querystring):
        # magic...

Answer 1

At the time limit is called, you have access to the name as an ordinary variable. Just drop the self..

class Universalis:
    API_ENDPOINT = "http://universalis.app/api/v2/North-America/"
    UNIVERSALIS_MAX_CALLS_PER_SECOND = 13
    UNIVERSALIS_MAX_CONNECTIONS = 6
    LISTINGS_PER_API_CALL = 500

    @sleep_and_retry
    @limits(calls=UNIVERSALIS_MAX_CALLS_PER_SECOND, period=1)
    def fetch_and_process_item_listings(self, item_ids_querystring):
        # magic...

Here's a simple example that shows the "class attribute" used as a regular variable.

def d(n):
    print(n)
    def _(f):
        return f
    return _


class Foo:
    X = 5
    @d(X)
    def method(self):
        pass

When foo is defined, the decorator will print the value of Foo.X to standard output, since n receives the value of the variable X that will be used to define the class attribute.