docs: def find_shows_by_category(self, category, genre=None, area=None,
                                 release_year=None, paid=None,
                                 orderby='view-today-count',
                                 streamtypes=None, person=None,
                                 page=1, count=20):
          """doc: http://open.youku.com/docs/doc?id=62
          """
          url = 'https://openapi.youku.com/v2/shows/by_category.json'
          params = {
              'client_id': self.client_id,
              'category': category,
              'genre': genre,
              'area': area,
              'release_year': release_year,
              'paid': paid,
              'orderby': orderby,
              'streamtypes': streamtypes,
              'person': person,
              'page': page,
              'count': count
          }
          params = remove_none_value(params)
          r = requests.get(url, params=params)
          check_error(r)
          return r.json()