hub.py 文件源码

def print_exception(self, context, type, value, tb):
        # Python 3 does not gracefully handle None value or tb in
        # traceback.print_exception() as previous versions did.
        if value is None:
            sys.stderr.write('%s\n' % type.__name__)
        else:
            traceback.print_exception(type, value, tb)
        del tb
        if context is not None:
            if not isinstance(context, str):
                try:
                    context = self.format_context(context)
                except:
                    traceback.print_exc()
                    context = repr(context)
            sys.stderr.write('%s failed with %s\n\n' % (context, getattr(type, '__name__', 'exception'), ))