code: def set(self, key, value):
          "Set value to the key store."
          # if key already in data, update indexes
          if not isinstance(value, dict):
              raise BadValueError(
                  'The value {} is incorrect.'
                  ' Values should be strings'.format(value))
          _value = deepcopy(value)
          if key in self.data:
              self.delete_from_index(key)
          self.data[key] = _value
          self.update_index(key, _valuef set(self, key, value):
          "Set value to the key store."
          # if key already in data, update indexes
          if not isinstance(value, dict):
              raise BadValueError(
                  'The value {} is incorrect.'
                  ' Values should be strings'.format(value))
          _value = deepcopy(value)
          if key in self.data:
              self.delete_from_index(key)
          self.data[key] = _value
          self.update_index(key, _value)
docs: Set value to the key store.