How to use the pyactiveresource.activeresource.ResourceMeta function in pyactiveresource

def __init__(self, site, user=None, password=None, timeout=None,
                 format=formats.JSONFormat):
        super(ShopifyConnection, self).__init__(site, user, password, timeout, format)

    def _open(self, *args, **kwargs):
        self.response = None
        try:
            self.response = super(ShopifyConnection, self)._open(*args, **kwargs)
        except pyactiveresource.connection.ConnectionError as err:
            self.response = err.response
            raise
        return self.response

# Inherit from pyactiveresource's metaclass in order to use ShopifyConnection
class ShopifyResourceMeta(ResourceMeta):

    @property
    def connection(cls):
        """HTTP connection for the current thread"""
        local = cls._threadlocal
        if not getattr(local, 'connection', None):
            # Make sure these variables are no longer affected by other threads.
            local.user = cls.user
            local.password = cls.password
            local.site = cls.site
            local.timeout = cls.timeout
            local.headers = cls.headers
            local.format = cls.format
            local.version = cls.version
            local.url = cls.url
            if cls.site is None: