Issue 20426: Compiling a regex with re.DEBUG should force a recompile
Created on 2014-01-28 22:09 by leewz, last changed 2022-04-11 14:57 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| re_debug_cache.patch | pitrou, 2014-02-02 22:54 | |||
| Messages (6) | |||
|---|---|---|---|
| msg209595 - (view) | Author: Franklin? Lee (leewz) | Date: 2014-01-28 22:09 | |
Compiling a regex with the `re.DEBUG` flag indicates that the user wants to see the debug output. `re.compile` is cached, though, so there is the possibility of no output.
Example:
import re
re.compile('1',re.DEBUG) #expected output
re.compile('1',re.DEBUG) #no output
re.compile('',re.DEBUG) #no output (empty regex)
The workaround is to call `re.purge()`, which may remove other cached regexes that are still in use.
(Background: I wanted to check for equivalence of regexes, and a StackOverflow answer suggested comparing their `re.DEBUG`. http://stackoverflow.com/a/21398362/2963903)
|
|||
| msg209617 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) *  |
Date: 2014-01-29 07:08 | |
See also issue17441. |
|||
| msg210048 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2014-02-02 22:54 | |
A simple workaround is to bypass the cache when DEBUG is passed. See attached patch. (not sure this applies as a bug fix, but DEBUG probably isn't used in production anyway: the potential for breakage is low) |
|||
| msg210158 - (view) | Author: Roundup Robot (python-dev)  |
Date: 2014-02-03 20:01 | |
New changeset a7b180d5df5f by Antoine Pitrou in branch '3.3': Issue #20426: When passing the re.DEBUG flag, re.compile() displays the debug output every time it is called, regardless of the compilation cache. http://hg.python.org/cpython/rev/a7b180d5df5f New changeset a8bcfa290e68 by Antoine Pitrou in branch 'default': Issue #20426: When passing the re.DEBUG flag, re.compile() displays the debug output every time it is called, regardless of the compilation cache. http://hg.python.org/cpython/rev/a8bcfa290e68 |
|||
| msg210160 - (view) | Author: Roundup Robot (python-dev) |
Date: 2014-02-03 20:12 | |
New changeset e47f6883dedf by Antoine Pitrou in branch '2.7': Issue #20426: When passing the re.DEBUG flag, re.compile() displays the debug output every time it is called, regardless of the compilation cache. http://hg.python.org/cpython/rev/e47f6883dedf |
|||
| msg210161 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2014-02-03 20:13 | |
Ok, I've fixed the bug in all branches. Thanks for reporting! |
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:57:57 | admin | set | github: 64625 |
| 2014-02-03 20:13:29 | pitrou | set | status: open -> closed resolution: fixed messages: + msg210161 stage: patch review -> resolved |
| 2014-02-03 20:12:53 | python-dev | set | messages: + msg210160 |
| 2014-02-03 20:01:52 | python-dev | set | nosy:
+ python-dev messages: + msg210158 |
| 2014-02-02 22:54:43 | pitrou | set | files:
+ re_debug_cache.patch versions: + Python 2.7, Python 3.3, Python 3.4, - Python 3.5 messages: + msg210048 keywords:
+ patch |
| 2014-01-29 07:08:56 | serhiy.storchaka | set | nosy:
+ serhiy.storchaka, pitrou messages: + msg209617 |
| 2014-01-28 22:10:49 | ezio.melotti | set | stage: test needed versions: + Python 3.5, - Python 3.3 |
| 2014-01-28 22:09:38 | leewz | create | |