➜
This issue tracker has been migrated to GitHub,
and is currently read-only.
For more information,
see the GitHub FAQs in the Python's Developer Guide.
Created on 2008-10-22 21:52 by Pasha2009, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| default_argument_dictionary_bug.py | Pasha2009, 2008-10-22 21:52 | a minimal demostration of the crash | ||
| Messages (2) | |||
|---|---|---|---|
| msg75114 - (view) | Author: Pasha (Pasha2009) | Date: 2008-10-22 21:52 | |
Whenever the default argument to a function is a dictionary, and the function is called twice, then the function "remembers" the changes to the dictionary. This means that any time that a default argument is set to a dictionary, a list or any other built in data structure, it cannot be relied upon to correctly do the right thing. I assume this is actually two issues: 1) The default arguments are not being garbage collected after the function is done. You can check that by using a __del__ tracker 2) the argument is at the same memory location at all times. I have seen this on Python 2.5.2, however its highly possible other parts are affected as well. |
|||
| msg75115 - (view) | Author: Christian Heimes (christian.heimes) *  |
Date: 2008-10-22 21:54 | |
The behavior is correct, expected and well documented. http://effbot.org/pyfaq/why-are-default-values-shared-between-objects.htm |
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:40 | admin | set | github: 48431 |
| 2008-10-22 21:54:43 | christian.heimes | set | status: open -> closed resolution: not a bug messages: + msg75115 nosy: + christian.heimes |
| 2008-10-22 21:52:17 | Pasha2009 | create | |