base.py 文件源码

def load_wsgi(self):
        try:
            self.wsgi = self.app.wsgi()
        except SyntaxError as e:
            if self.cfg.reload == 'off':
                raise

            self.log.exception(e)

            # fix from PR #1228
            # storing the traceback into exc_tb will create a circular reference.
            # per https://docs.python.org/2/library/sys.html#sys.exc_info warning,
            # delete the traceback after use.
            try:
                exc_type, exc_val, exc_tb = sys.exc_info()
                self.reloader.add_extra_file(exc_val.filename)

                tb_string = six.StringIO()
                traceback.print_tb(exc_tb, file=tb_string)
                self.wsgi = util.make_fail_app(tb_string.getvalue())
            finally:
                del exc_tb