Irit Katriel <iritkatr...@yahoo.com> added the comment:
After debugging the default excepthook code (C version), I see that the difference is because the SyntaxError's lineno is None. It doesn't mind that the filename is None (it defaults it to <string>) but when it can't get the lineno it gives up here: https://github.com/python/cpython/blob/fb5db7ec58624cab0797b4050735be865d380823/Python/pythonrun.c#L481 If you run this script: --------------------------------------- import traceback import sys se = SyntaxError("wrong!") se.filename = "myfile.py" print("========== lineno is None ==========") print('traceback.print_exception:') traceback.print_exception(type(se), se, None) print('---------------------') print('sys.excepthook:') sys.excepthook(type(se), se, None) print('---------------------') se.lineno = 55 print("========== lineno is 55 ==========") print('traceback.print_exception:') traceback.print_exception(type(se), se, None) print('---------------------') print('sys.excepthook:') sys.excepthook(type(se), se, None) print('---------------------') --------------------------------------- The output is: --------------------------------------- Running Release|x64 interpreter... ========== lineno is None ========== traceback.print_exception: File "myfile.py", line None SyntaxError: wrong! --------------------- sys.excepthook: <-- file-lineno missing SyntaxError: wrong! (myfile.py) --------------------- ========== lineno is 55 ========== traceback.print_exception: File "myfile.py", line 55 SyntaxError: wrong! --------------------- sys.excepthook: File "myfile.py", line 55 <-- file-lineno is there SyntaxError: wrong! --------------------- --------------------------------------- ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue34463> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
