Message 373481 - Python tracker

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Author	arcivanov
Recipients	BTaskaya, arcivanov, dino.viehland, vstinner
Date	2020-07-10.20:59:10
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
> If sys.modules['_ast'] is cleared and then _ast is imported again, _PyState_AddModule() is called to store the new _ast module instance which calls astmodule_clear() on the old module instance. I'm confused about this. In the repro below the sys.modules.clear() is indeed cleared, but references to all modules are retained. Where is the garbage collection/module re-initialization coming from? All of the references are live.

> If sys.modules['_ast'] is cleared and then _ast is imported again, _PyState_AddModule() is called to store the new _ast module instance which calls astmodule_clear() on the old module instance.

I'm confused about this. In the repro below the sys.modules.clear() is indeed cleared, but references to all modules are retained. 

Where is the garbage collection/module re-initialization coming from? All of the references are live.

History
Date	User	Action	Args
2020-07-10 20:59:10	arcivanov	set	recipients: + arcivanov, vstinner, dino.viehland, BTaskaya
2020-07-10 20:59:10	arcivanov	set	messageid: <[email protected]>
2020-07-10 20:59:10	arcivanov	link	issue41261 messages
2020-07-10 20:59:10	arcivanov	create