code: def get_years_active(self, cache=True):
          
          if cache and ('years_active' in self.cache):
              return self.cache['years_active']
          else:
              response = self.get_attribute('profile', bucket=['years_active'])
              self.cache['years_active'] = response['artist']['years_active']
              return response['artist']['years_active']
docs: Get a list of years active dictionaries for an artist
          
          Args:
          
          Kwargs:
              cache (bool): A boolean indicating whether or not the cached value should be used (if available). Defaults to True.
          
          Returns:
              A list of years active dictionaries; list contains additional attributes 'start' and 'total'
              
          Example:
  
          >>> a = artist.Artist('yelle')
          >>> a.get_years_active()
          [{ start: 2005 }]
          >>>