Method _checkWritable

Lib/_pyio.py:1651–1653

(self, msg=None)

            raise UnsupportedOperation('File not open for reading')

    def _checkWritable(self, msg=None):
        if not self._writable:
            raise UnsupportedOperation('File not open for writing')

    def read(self, size=None):
        """Read at most size bytes, returned as bytes.