Issue1207379
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 2005-05-23 22:02 by master_jaf, last changed 2022-04-11 14:56 by admin. This issue is now closed.
Files | ||||
---|---|---|---|---|
File name | Uploaded | Description | Edit | |
code.py | master_jaf, 2005-05-23 22:02 | sample code |
Messages (10) | |||
---|---|---|---|
msg25397 - (view) | Author: MartinKirst (master_jaf) | Date: 2005-05-23 22:02 | |
Classes which are not instantiated from 'object', containing properties, are not working as expected. The GET method is working but not the SET method. Tested with python 2.4.1 und 2.3.5. See sample code file. |
|||
msg25398 - (view) | Author: Michael Hudson (mwh) | Date: 2005-05-24 07:58 | |
Logged In: YES user_id=6656 At the very limit, this is a documentation bug. Why did you think properties could be attached to old-style classes? |
|||
msg25399 - (view) | Author: MartinKirst (master_jaf) | Date: 2005-05-24 12:27 | |
Logged In: YES user_id=1140154 After reading some more documentation I've found at Python Tutorial "D. Glossary" more hints. <cite> Any class that inherits from object. This includes all built-in types like list and dict. Only new-style classes can use Python's newer, versatile features like __slots__, descriptors, properties, __getattribute__(), class methods, and static methods. </cite> Fine. OK, understood.. I'm tending to agree with mwh's opinion, that this is a documentation bug, although I don't fully understand why the GET descriptor is working but unlikly not the SET descriptor. |
|||
msg25400 - (view) | Author: Terry J. Reedy (terry.reedy) * | Date: 2005-05-26 16:37 | |
Logged In: YES user_id=593130 For people who learned Python with old-style classes, it is 'obvious' that properties are a new addition that came with and work with new-style classes. Can you suggest specific places in the docs where clarification could be made? Or should be close this? (I suspect that setting is more complicated than getting but would not have expected even the get method to work.) |
|||
msg25401 - (view) | Author: MartinKirst (master_jaf) | Date: 2005-05-26 18:59 | |
Logged In: YES user_id=1140154 From my point of view (I'm just learning Python) there is only a simple difference between old and new style classes, just the (object) while defining a class. For sure, we can close this. My questions were answered :-) So my suggestions for adding info to the documentation: "Python Tutorial": Chap. 9.3., ex. With Python 2.2 new style classes were introduced. These new style classes are inherited from 'object' base class and supporting newer features like properties, slots etc.. It is recommended to use new style classes. "Python Library Reference": Chap. 2.1 Built-in Functions, ex. property([fget[, fset[, fdel[, doc]]]]) [....] New in Python 2.2. Properties only can applied to new style classes. See also "D. Glossary" -> new style classes for more details. |
|||
msg25402 - (view) | Author: Georg Brandl (georg.brandl) * | Date: 2005-06-04 10:27 | |
Logged In: YES user_id=1188172 Attaching a patch for the Tutorial. It adds the following sentence: +Note that with Python 2.2, a new kind of classes was introduced: +A class deriving from \class{object} is called a \emph{new-style class}. +The differences to classic classes are mostly internal, but there are +some features (like properties and static methods) that are only +available for new-style classes. + |
|||
msg25403 - (view) | Author: Raymond Hettinger (rhettinger) * | Date: 2005-08-21 11:35 | |
Logged In: YES user_id=80475 Stay close to the definition in the tutorial's glossary: """ new-style class Any class that inherits from object. This includes all built-in types like list and dict. Only new-style classes can use Python's newer, versatile features like __slots__, descriptors, properties, __getattribute__(), class methods, and static methods. """ Also, the 2.2 comment should be in standard form markup: \versionadded{} "classes" ==> "class" Overall, -0 on the update. Ideally, the tutorial should be kept free of the more advanced concepts like properties, static methods, descriptors, and whatnot. |
|||
msg25404 - (view) | Author: Georg Brandl (georg.brandl) * | Date: 2005-08-21 14:17 | |
Logged In: YES user_id=1188172 What am I to do? Correct the patch and apply, or close this as Rejected? |
|||
msg25405 - (view) | Author: MartinKirst (master_jaf) | Date: 2005-08-21 20:55 | |
Logged In: YES user_id=1140154 I agree with rhettinger, that there is no need to put advanced things like properties in the tutorial. But I still think, that the property explanation in "Python Lib. Ref." could be a bit more precise. IMHO it's not enough to say "Return a property attribute for new-style classes..." because it does not prohibit explicitly the usage in "old style classes". Suggestion: "Python Library Reference": Chap. 2.1 Built-in Functions, ex. property([fget[, fset[, fdel[, doc]]]]) [....] New in Python 2.2. Properties only can be applied to new style classes. See also "D. Glossary" -> new style classes for more details. |
|||
msg55859 - (view) | Author: Georg Brandl (georg.brandl) * | Date: 2007-09-12 19:05 | |
It says "... for new-style classes (classes that derive from object)." I think this is clear enough. |
History | |||
---|---|---|---|
Date | User | Action | Args |
2022-04-11 14:56:11 | admin | set | github: 42004 |
2007-09-12 19:05:52 | georg.brandl | set | status: open -> closed resolution: wont fix messages: + msg55859 |
2005-05-23 22:02:03 | master_jaf | create |