(self)
return self.__error
Return the error string or None if no error occurred.
Return the error string or None if no error occurred.
Return the error string or None if no error occurred .
def errorString(self):
        # type: () -> Optional[str]
        """
        Return the error string or None if no error occurred.
        """
        return self.__error
def errorString ( self ) : # type: () -> Optional[str] return self . __error