url_of_1st_level_cat -> url_of_2nd_level_cat -> url_of_3rd_level_cat -> leaf

[url_of_1st_level_cat,url_of_2nd_level_cat,url_of_3rd_level_cat]

def find_leafs_of_category(self,url):


   subcategories = self.get_subcategories(url)
   for subcategory in subcategories:
        if is_leaf(subcategory):
            # DO STUFF

        else: self.find_leafs_of_category(subcategory)