3.5.0a2, my Win 7 and Guido's new Win laptop: error tracebacks are mangled in a way that makes Idle severely less functional, hence 'release blocker'.  First, the normal behavior.Python 3.5.0a2 (v3.5.0a2:0337bd7ebcb6+, Mar  9 2015, 10:29:45) [MSC v.1900 64 bit (AMD64)] on win32>>> 1/0Traceback (most recent call last):  File "<stdin>", line 1, in <module>ZeroDivisionError: division by zeroIdle 3.4.3 and previous give same, with the helpful addition of the code line ('1/0'), as in batch mode tracebacks, since it uses the traceback module.  But Idle 3.5.0a2 started from the installed icon gives>>> 1/0Traceback (most recent call last):Traceback (most recent call last):Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 353, in runcode    exec(code, self.locals)  File "<pyshell#1>", line 1, in <module>ZeroDivisionError: division by zeroDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 126, in main    ret = method(*args, **kwargs)  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 365, in runcode    print_exception()  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 216, in print_exception    print_exc(typ, val, tb)  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 211, in print_exc    traceback.print_list(tbe, file=efile)  File "C:\Program Files\Python 3.5\lib\traceback.py", line 22, in print_list    for item in StackSummary.from_list(extracted_list).format():  File "C:\Program Files\Python 3.5\lib\traceback.py", line 370, in format    frame.filename, frame.lineno, frame.name))AttributeError: 'tuple' object has no attribute 'filename'>>> ================================ RESTART ================================>>> run.py (as should be more or less everything in idlelib) is identical in 3.4 and 3.5.  Idle started from a command line (py -3 -m idlelib) gives an even worse result.  The Idle Shell just shows>>> 1/0Traceback (most recent call last):Traceback (most recent call last):>>> ================================ RESTART ================================>>> while the following appears in the command window (Command Prompt or PowerShell).Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 353, in runcode    exec(code, self.locals)  File "<pyshell#0>", line 1, in <module>ZeroDivisionError: division by zeroDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 126, in main    ret = method(*args, **kwargs)  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 365, in runcode    print_exception()  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 216, in print_exception    print_exc(typ, val, tb)  File "C:\Program Files\Python 3.5\lib\idlelib\run.py", line 211, in print_exc    traceback.print_list(tbe, file=efile)  File "C:\Program Files\Python 3.5\lib\traceback.py", line 22, in print_list    for item in StackSummary.from_list(extracted_list).format():  File "C:\Program Files\Python 3.5\lib\traceback.py", line 370, in format    frame.filename, frame.lineno, frame.name))AttributeError: 'tuple' object has no attribute 'filename'Exception in Tkinter callbackTraceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\rpc.py", line 359, in pollpacket    s = self.sock.recv(BUFSIZE)ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the rDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\rpc.py", line 432, in pollresponse    message = self.pollmessage(wait)  File "C:\Program Files\Python 3.5\lib\idlelib\rpc.py", line 384, in pollmessage    packet = self.pollpacket(wait)  File "C:\Program Files\Python 3.5\lib\idlelib\rpc.py", line 361, in pollpacket    raise EOFErrorEOFErrorDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\idlelib\PyShell.py", line 565, in poll_subprocess    response = clt.pollresponse(self.active_seq, wait=0.05)  File "C:\Program Files\Python 3.5\lib\idlelib\rpc.py", line 436, in pollresponse    self.handle_EOF()  File "C:\Program Files\Python 3.5\lib\idlelib\PyShell.py", line 383, in handle_EOF    raise EOFErrorEOFErrorDuring handling of the above exception, another exception occurred:Traceback (most recent call last):ValueError: invalid literal for int() with base 10: '??'During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Program Files\Python 3.5\lib\tkinter\__init__.py", line 1534, in __call__    args = self.subst(*args)  File "C:\Program Files\Python 3.5\lib\tkinter\__init__.py", line 1252, in _substitute    e.num = getint_event(b)  File "C:\Program Files\Python 3.5\lib\tkinter\__init__.py", line 1231, in getint_event    return int(s)SystemError: result with error in PyObject_CallThis needs to be checked on another OS, but the traceback problem does not strike me as Windows-specific.

Yeah, the stack track makes me suspecthttp://bugs.python.org/issue17911

I suspect that this is due to a list being passed in that wasn't created by traceback, in the older tuple-only format. That was meant to work, but possibly is being short circuited somewhere. Shall fix asap.

Ah, idle is being somewhat naughty. It's taking the original traceback and then mangling the contents in-place, which is preserving the type information, and throwing off StackSummary.from_list. We can and should make the new code deal with this in case other folk are doing it. In future it would be good to subsume cleanup_traceback's guts into the traceback module, but we don't need to do that now.

And here is a patch, since this is a regression I'll apply it tomorrow (or sooner if it gets reviews :))

Patch looks good to me.

New changesetea3cc128ce35 by Robert Collins in branch 'default':Issue#23631: Fix traceback.format_list when a traceback has been mutated.https://hg.python.org/cpython/rev/ea3cc128ce35

Closing, though ideally Terry can confirm it is fully fixed for him.