[issue18669] curses.chgat() moves cursor, documentation says it shouldn't
New submission from productivememberofsociety666: According to docs.python.org/2/library/curses.html#chgat (or any other version), curses.chgat() is not supposed to move the cursor at all. This is true if you don't give it x,y coordinates, but if you do, the cursor does in fact move to those coordinates, since it then uses C curses's mvchgat() internally and doesn't correct the position afterwards. See included file for demonstration: Expected output is: one two Actual output is: two Fix the documentation or fix the code :-) ---------- assignee: docs@python components: Documentation, Extension Modules files: chgat-bug.py messages: 194552 nosy: docs@python, productivememberofsociety666 priority: normal severity: normal status: open title: curses.chgat() moves cursor, documentation says it shouldn't type: behavior versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5 Added file: http://bugs.python.org/file31175/chgat-bug.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Changes by productivememberofsociety666 <productivememberofsociety666@sol.fr.am>: Removed file: http://bugs.python.org/file31175/chgat-bug.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Changes by productivememberofsociety666 <productivememberofsociety666@sol.fr.am>: Added file: http://bugs.python.org/file31178/chgat-bug.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Mark Lawrence added the comment: Can we have a comment on this please. ---------- nosy: +BreamoreBoy versions: -Python 2.6, Python 3.1, Python 3.2, Python 3.3 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
IronGrid added the comment: I get this error with 3.2.3, running Debian Stable. It's annoying because this error prevents curses apps from being able to highlight the current line. ---------- nosy: +IronGrid versions: +Python 3.2 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Berker Peksag added the comment: I think this is a documentation issue. curses.chgat() documentation tries to describe different signatures in one place and some of these signatures change the behavior of the function. For example, curses.chgat() calls mvwchgat() when users pass y and x to it and mvwchgat() is documented as "the mvwchgat function does a cursor move before acting". ---------- keywords: +easy nosy: +berker.peksag stage: -> needs patch versions: +Python 3.6, Python 3.7 -Python 3.2, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Changes by Mark Lawrence <breamoreboy@gmail.com>: ---------- nosy: -BreamoreBoy _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Changes by Roundup Robot <devnull@psf.upfronthosting.co.za>: ---------- pull_requests: +1558 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18669> _______________________________________
Change by Serhiy Storchaka <storchaka+cpython@gmail.com>: ---------- assignee: docs@python -> serhiy.storchaka nosy: +serhiy.storchaka _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue18669> _______________________________________
Change by Serhiy Storchaka <storchaka+cpython@gmail.com>: ---------- resolution: -> fixed stage: needs patch -> resolved status: open -> closed versions: -Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue18669> _______________________________________
Serhiy Storchaka <storchaka+cpython@gmail.com> added the comment: New changeset b838cc3ff4e039af949c6a19bd896e98e944dcbe by Serhiy Storchaka (Chillar Anand) in branch 'master': bpo-18699: Corrected documentation for window.chgat in curses module (#1430) https://github.com/python/cpython/commit/b838cc3ff4e039af949c6a19bd896e98e94... New changeset 6dbecd2cd9c9448b34e1a632509220f3c4cf7587 by Serhiy Storchaka (Miss Islington (bot)) in branch '3.6': bpo-18699: Corrected documentation for window.chgat in curses module (GH-1430) (#4271) https://github.com/python/cpython/commit/6dbecd2cd9c9448b34e1a632509220f3c4c... New changeset fd38819497fd2a52ada674f0c890f5b414d0e87f by Serhiy Storchaka in branch '2.7': [2.7] bpo-18699: Corrected documentation for window.chgat in curses module (GH-1430). (#4272) https://github.com/python/cpython/commit/fd38819497fd2a52ada674f0c890f5b414d... There is a typo in the issue number in commit messages. ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue18669> _______________________________________
participants (6)
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Berker Peksag -
IronGrid
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Mark Lawrence
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productivememberofsociety666
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Roundup Robot
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Serhiy Storchaka