code: def search_composite(self, query, source, payload=None):
          '''Shortcut search with composite source'''
          source = '+'.join(source)
  
          if payload is None:
              payload = dict(Sources=quote(source))
          else:
              payload['Sources'] = quote(source)
  
          return self.search(query, 'Composite', payloadf search_composite(self, query, source, payload=None):
          '''Shortcut search with composite source'''
          source = '+'.join(source)
  
          if payload is None:
              payload = dict(Sources=quote(source))
          else:
              payload['Sources'] = quote(source)
  
          return self.search(query, 'Composite', payload)
docs: Shortcut search with composite source