code: def remove(self, collection, **kwargs):
          '''
          remove records from collection whose parameters match kwargs
          '''
          callback = kwargs.pop('callback')
          yield Op(self.db[collection].remove, kwargs)
          callback(f remove(self, collection, **kwargs):
          '''
          remove records from collection whose parameters match kwargs
          '''
          callback = kwargs.pop('callback')
          yield Op(self.db[collection].remove, kwargs)
          callback()
docs: remove records from collection whose parameters match kwargs