[issue5492] Error on leaving IDLE with quit() or exit() under Linux
Ger Luijten added the comment: Hello Roger, Thanks for the clear explanation! Greetings, Ger 2013/4/20 Roger Serwy rep...@bugs.python.org Roger Serwy added the comment: Good catch Terry! I've been testing using python -m idlelib.idle instead of importing it from an interactive prompt. I'll need to remember to consider that test vector in the future. I figured out why those messages are popping up. The Tk event loop remains running when in the interactive Python REPL due to a PyOS_InputHook driving the Tk loop periodically. Some .after callbacks expire and Tcl tries calling into a Python function that no longer exists. The ColorDelegator's recolorize() and PyShell's poll_subprocess() are the callbacks. (Adding a print(name, func) to the after() function in Lib/tkinter/__init__.py revealed the link between the Tcl reference name and the Python reference name.) The extra ColorDelegator call is actually a bug, related to #13495. (I need to expand it that issue to include this new problem.) Two ColorDelegators get loaded, and only one gets its close() method called which properly cancels the .after callback into recolorize. The orphaned ColorDelegator still exists in the delegator chain with an active .after callback. Once both those .after callbacks are canceled, then the error messages Terry sees are no longer shown. The rev1 patch includes extra code to handle cancellation of the poll_subprocess .after callback. I'll be posting the multi-color delegator fix to #13495. -- dependencies: +IDLE: Regressions - Two ColorDelegator instances loaded and -e no longer edits new files. Added file: http://bugs.python.org/file29945/issue5492_rev1.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5492 ___ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5492 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5492] Error on leaving IDLE with quit() or exit() under Linux
Ger Luijten added the comment: Hello Roger, To you and others that worked on this bug a big thanks for the extra deep dig into the chain of events to find this old bug and fix it. Impressive! Because I'm not familiar with the inner workings that cause this bug I was wondering if the kill command you use is the structural solution or just a clever workarond to prevent the error being written to the text widget and forcing the program to stop abruptly. For me your explanation raised the question if other processes that should terminate normally are now prevented from doing so and for instance are not able to do clear allocated memory (garbage collection). Could you shed some light on your bug fix? Greetings, Ger 2013/4/1 Roger Serwy rep...@bugs.python.org Roger Serwy added the comment: I found the root cause of the original error. Entering exit() at the shell raises SystemExit which gets written to the shell's text widget. The call to actually write the text passes through .write() in Lib/idlelib/OutputWindow.py, which calls text.update(). The call to .update() enters the Tk event loop and flushes pending events, including expired .after callbacks. Forcing the .after callback in .close() to 1 ms will always trigger the error. Commenting out the text.update() in OutputWindow.py avoids the error. The patch causes .kill_subprocess() to execute immediately which prevents the subprocess from writing to sys.stderr. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5492 ___ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5492 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5494] Failure in test_httpservers on Linux
New submission from Ger Luijten gcjm.luij...@gmail.com: Hello developers, While running 'make test' for Python 3.1a1 there was an error reported, obviously a permission problem, but when trying to run the reported server.py script in verbose mode it turned up an error in the regrtest.py script. Manually running the server.py script seems to go fine. See my installation notes below. Commands were issued with and without sudo in a terminal under fully updated Kubuntu 8.10 and with no installation problems for Python 3.1a1. Also I noticed Issue 4951 failure in test_httpserver under Windows, but with a different kind of error message. Greetings, Ger $ sudo make test Errors: 1 error reported; no idea what the script server.py is trying to access for which it says to have no rights. This error was listed 3 times: test_httpservers Traceback (most recent call last): File /home/ger/Systeembeheer/Python/Python_Packages/Python-3.1a1/Lib/http/server.py, line 1031, in run_cgi OSError: [Errno 13] Permission denied test test_httpservers failed -- errors occurred; run in verbose mode for details See the readme file for the Python installation on how to run the script in verbose mode: General: $ ./python Lib/test/regrtest.py -v test_whatever So go to the folder Python-3.1a1/Lib/test/ Run testscript in verbose mode: $ sudo ./regrtest.py -v server.py No idea if this regrtest.py script knows the path to server.py, otherwise add the correct path later in testing. This shows a programming error in the regrtest.py script, so a run of server.py is not possible with this script: File ./regrtest.py, line 185 print(msg, file=sys.stderr) ^ SyntaxError: invalid syntax So let's run the server.py script directly to see if this script crashes or not. When directly running the server.py script with and without sudo it runs with no errors, until broken off by Ctrl+C. The script seems to run or simulate a small webserver for tests. Python-3.1a1/Lib/http$ sudo python3.1 server.py Serving HTTP on 0.0.0.0 port 8000 ... ^CTraceback (most recent call last): File server.py, line 1101, in module test(HandlerClass=BaseHTTPRequestHandler) File server.py, line 1097, in test httpd.serve_forever() File /usr/local/lib/python3.1/socketserver.py, line 224, in serve_forever r, w, e = select.select([self], [], [], poll_interval) KeyboardInterrupt -- components: Tests messages: 83631 nosy: gerluijten severity: normal status: open title: Failure in test_httpservers on Linux type: crash versions: Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5494 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4951] failure in test_httpservers
Ger Luijten gcjm.luij...@gmail.com added the comment: Reported Issue 5494 Failure in test_httpservers on Linux with other error message. Maybe there is a relation, maybe not. Greetings, Ger -- nosy: +gerluijten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4951 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
