Warning about remaining subinterpreters should suggest using of concurrent.interpreters.Interpeter · Issue #141509 · python/cpython · GitHub

Bug report

Bug description:

finalize_subinterpreters checks if remaining subinterpreters are present and if so suggest to destroy them via destroy method of internal _interpreters module. I propose to change the warning message to use Interpeter.close as it less confusing.

cpython/Python/pylifecycle.c

Lines 2642 to 2648 in 2fbd396

    
           /* Warn the user if they forgot to clean up subinterpreters. */ 
        
           (void)PyErr_WarnEx( 
        
                   PyExc_RuntimeWarning, 
        
                   "remaining subinterpreters; " 
        
                   "destroy them with _interpreters.destroy()", 
        
                   0);

@ZeroIntensity @ericsnowcurrently What do you think?

If yes, I'm ready to fix this.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

I think it'd be fine to change it, yeah. Eric added that warning long before concurrent.interpreters was a thing.

GH-141509: Fix warning about remaining subinterpreters (GH-141528)

[3.14] pythonGH-141509: Fix warning about remaining subinterpreters (p…

[3.14] GH-141509: Fix warning about remaining subinterpreters (GH-141528

PR merged and backported. Closing this now.
Thanks!

pythonGH-141509: Fix warning about remaining subinterpreters (pythonG…

Warning about remaining subinterpreters should suggest using of concurrent.interpreters.Interpeter · Issue #141509 · python/cpython · GitHub

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Warning about remaining subinterpreters should suggest using of concurrent.interpreters.Interpeter #141509

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	/* Warn the user if they forgot to clean up subinterpreters. */
	(void)PyErr_WarnEx(
	PyExc_RuntimeWarning,
	"remaining subinterpreters; "
	"destroy them with _interpreters.destroy()",
	0);

Warning about remaining subinterpreters should suggest using of concurrent.interpreters.Interpeter · Issue #141509 · python/cpython · GitHub

Repository navigation

Warning about remaining subinterpreters should suggest using of concurrent.interpreters.Interpeter #141509

Description

Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

Activity

ZeroIntensity commented on Nov 13, 2025

sergey-miryanov commented on Nov 15, 2025

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