run.py 文件源码

def print_exception():
    import linecache
    linecache.checkcache()
    flush_stdout()
    efile = sys.stderr
    typ, val, tb = excinfo = sys.exc_info()
    sys.last_type, sys.last_value, sys.last_traceback = excinfo
    seen = set()

    def print_exc(typ, exc, tb):
        seen.add(exc)
        context = exc.__context__
        cause = exc.__cause__
        if cause is not None and cause not in seen:
            print_exc(type(cause), cause, cause.__traceback__)
            print("\nThe above exception was the direct cause "
                  "of the following exception:\n", file=efile)
        elif (context is not None and
              not exc.__suppress_context__ and
              context not in seen):
            print_exc(type(context), context, context.__traceback__)
            print("\nDuring handling of the above exception, "
                  "another exception occurred:\n", file=efile)
        if tb:
            tbe = traceback.extract_tb(tb)
            print('Traceback (most recent call last):', file=efile)
            exclude = ("run.py", "rpc.py", "threading.py", "queue.py",
                       "RemoteDebugger.py", "bdb.py")
            cleanup_traceback(tbe, exclude)
            traceback.print_list(tbe, file=efile)
        lines = traceback.format_exception_only(typ, exc)
        for line in lines:
            print(line, end='', file=efile)

    print_exc(typ, val, tb)