code: def filter(self, chamber, congress=CURRENT_CONGRESS, **kwargs):
          
          check_chamber(chamber)
  
          kwargs.update(chamber=chamber, congress=congress)
  
          if 'state' in kwargs and 'district' in kwargs:
              path = ("members/{chamber}/{state}/{district}/"
                      "current.json").format(**kwargs)
  
          elif 'state' in kwargs:
              path = ("members/{chamber}/{state}/"
                      "current.json").format(**kwargs)
  
          else:
              path = ("{congress}/{chamber}/"
                      "members.json").format(**kwargs)
  
          return self.fetch(path, parse=lambda r: r['results'])
docs: Takes a chamber and Congress,
          OR state and district, returning a list of members