Method _checkClosed

Lib/_pyio.py:470–475

Internal: raise a ValueError if file is closed

(self, msg=None)

        return self.__closed

    def _checkClosed(self, msg=None):
        """Internal: raise a ValueError if file is closed
        """
        if self.closed:
            raise ValueError("I/O operation on closed file."
                             if msg is None else msg)

    ### Context manager ###