docs: def set(self, key, value, expire_in=None):
      """
      Function to set or change particular property in the storage
  
      :param key: key name
      :param value:  value to set
      :param expire_in: seconds to expire key
      :type key str
      :type expire_in int
      """
      if key not in self._keystore:
        self._keystore[key] = InMemoryItemValue(expire_in=expire_in)
  
      k = self._keystore[key]
      """:type k InMemoryItemValue"""
      k.update_expire_time(expire_in)
      k.value = value