'Callback for partial output.'

def _partial(self):

    raw_stdout = self._process.readAllStandardOutput()
    stdout = handle_qbytearray(raw_stdout, self._get_encoding())
    if (self._partial_stdout is None):
        self._partial_stdout = stdout
    else:
        self._partial_stdout += stdout
    self.sig_partial.emit(self, stdout, None)
