def __init__(self, api_key, category=None, country=None):
self.category = category<EOL>self.country = country<EOL>super(TopSitesAPI, self).__init__(api_key)<EOL>
Parameters
----------
api_key: string
    SimilarWeb API key

category: string
    If left blank, `All Categories` will be requested.
    Use `http://api.similarweb.com/v1/TopSites/categories` to get a list of available categories.

country: string
    If left blank, `Worldwide` will be requested.
    Use `http://api.similarweb.com/v1/TopSites/countries` to get a list of available categories.