Method _checkReadable

Lib/_pyio.py:441–446

Internal: raise UnsupportedOperation if file is not readable

(self, msg=None)

        return False

    def _checkReadable(self, msg=None):
        """Internal: raise UnsupportedOperation if file is not readable
        """
        if not self.readable():
            raise UnsupportedOperation("File or stream is not readable."
                                       if msg is None else msg)

    def writable(self):
        """Return a bool indicating whether object was opened for writing.