original_docstring: The period in which Cloud Spanner retains all versions of data
          for the database.
  
          :rtype: str
          :returns: a string representing the duration of the version retention period
          
docstring: The period in which Cloud Spanner retains all versions of data
  for the database.
docstring_tokens: The period in which Cloud Spanner retains all versions of data for the database .
code: def version_retention_period(self):
          """The period in which Cloud Spanner retains all versions of data
          for the database.
  
          :rtype: str
          :returns: a string representing the duration of the version retention period
          """
          return self._version_retention_period
code_tokens: def version_retention_period ( self ) : return self . _version_retention_period
short_docstring: The period in which Cloud Spanner retains all versions of data
  for the database.
short_docstring_tokens: The period in which Cloud Spanner retains all versions of data for the database .
comment: """The period in which Cloud Spanner retains all versions of data
          for the database.
  
          :rtype: str
          :returns: a string representing the duration of the version retention period
          """