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Created on 2016-05-29 22:52 by ppperry, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (4) | |||
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| msg266644 - (view) | Author: (ppperry) | Date: 2016-05-29 22:52 | |
If one executes the following statements: >>> class metatype(type):pass >>> class x(type,metaclass=metatype):pass >>> x.__class__ = x , one gets a type that is it's own type: (`type(x) is x`). However, `isinstance(x,x)` unexpectedly returns False. How is my `x` type not an instance of itself. |
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| msg266646 - (view) | Author: Anilyka Barry (abarry) *  |
Date: 2016-05-29 22:56 | |
Works for me: >>> class meta(type): pass ... >>> class X(type, metaclass=meta): pass ... >>> X.__class__ = X >>> type(X) is X True >>> isinstance(X, X) True |
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| msg266647 - (view) | Author: Anilyka Barry (abarry) * |
Date: 2016-05-29 23:04 | |
This seems as though you might be using an older version of the interpreter (I tested in 3.4.3, 3.5.1 and 3.6.0a1+). Where did you get your interpreter? The official releases are on https://www.python.org/downloads/ - if you got it somewhere else, that might be something for whoever packaged your installer to fix. |
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| msg266648 - (view) | Author: (ppperry) | Date: 2016-05-29 23:14 | |
Never mind this issue, I was confused when reporting. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:31 | admin | set | github: 71345 |
| 2016-05-29 23:14:16 | ppperry | set | messages: + msg266648 |
| 2016-05-29 23:04:16 | abarry | set | messages: + msg266647 |
| 2016-05-29 22:56:03 | abarry | set | status: open -> closed nosy: + abarry messages: + msg266646 resolution: works for me stage: resolved |
| 2016-05-29 22:53:11 | ppperry | set | title: `isnstance` function does not handle types that are their own type -> `isinstance` function does not handle types that are their own type |
| 2016-05-29 22:53:01 | ppperry | set | title: `isnstance` builtin does not handle types that are their own type -> `isnstance` function does not handle types that are their own type |
| 2016-05-29 22:52:49 | ppperry | set | type: behavior |
| 2016-05-29 22:52:41 | ppperry | create | |