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Created on 2009-11-02 21:55 by vladc6, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Files | ||||
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| File name | Uploaded | Description | Edit | |
| class_member_init_inconsistency.py | vladc6, 2009-11-02 21:55 | Sample program demonstrating inconsistency in member initialization | ||
| Messages (2) | |||
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| msg94851 - (view) | Author: Vlad (vladc6) | Date: 2009-11-02 21:55 | |
If a class member is declared outside of a function, it's creation is _not_ repeated with every new instance of the class. Instead, the same member is created during the first instance and then shared by all the subsequent instances of that class. This is wrong, because a new member should be created for every instance. I have attached a sample code contrasting the incorrect behavior (on top) with the correct behavior (on bottom). Python behaves correctly if the member is declared in __init__ (that is, Python initializes a new member for every instance). The output of "print b.greet" and "print d.greet" should be the same and should read "['Howdy']". |
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| msg94854 - (view) | Author: R. David Murray (r.david.murray) *  |
Date: 2009-11-02 22:18 | |
This is the way python works. For help on using python please post to python-list or python-tutor. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:54 | admin | set | github: 51503 |
| 2009-11-02 22:18:54 | r.david.murray | set | status: open -> closed priority: low nosy: + r.david.murray messages: + msg94854 resolution: not a bug stage: resolved |
| 2009-11-02 21:55:35 | vladc6 | create | |