def _setup_process_environment(self, env):
        """
        Sets up the process environment.
        """
        environ = self._process.processEnvironment()
        if env is None:
            env = {}
        for k, v in os.environ.items():
            environ.insert(k, v)
        for k, v in env.items():
            environ.insert(k, v)
        if sys.platform != 'win32':
            environ.insert('TERM', 'xterm')
            environ.insert('LINES', '24')
            environ.insert('COLUMNS', '450')
        environ.insert('PYTHONUNBUFFERED', '1')
        environ.insert('QT_LOGGING_TO_CONSOLE', '1')
        return environ
Sets up the process environment.