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Allow omitting _pyrepl module #145035

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Allow omitting _pyrepl module#145035
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zooba
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3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesextension-modulesC modules in the Modules dirC modules in the Modules dirpendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is providedtopic-replRelated to the interactive shellRelated to the interactive shelltype-featureA feature request or enhancementA feature request or enhancement
@zooba

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@zooba
zooba
opened on Feb 20, 2026
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Currently, launching Python without the _pyrepl module present causes it to abort. It would be better if it simply went into regular repl mode, rather than requiring the user to set an env var, as this would allow distributors to simply omit the module rather than having to patch and rebuild CPython.

cpython/Modules/main.c

Lines 281 to 286 in 175ab31

PyObject *pyrepl = PyImport_ImportModule("_pyrepl.main");
if (pyrepl == NULL) {
fprintf(stderr, "Could not import _pyrepl.main\n");
res = pymain_exit_err_print();
goto done;
}

I would prefer messages about ModuleNotFoundError here to only be shown in verbose mode, though other errors could still cause a full failure (if that's what the maintainers think is best... I disagree, but it's not important to me like ModuleNotFoundError would be).

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3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesextension-modulesC modules in the Modules dirC modules in the Modules dirpendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is providedtopic-replRelated to the interactive shellRelated to the interactive shelltype-featureA feature request or enhancementA feature request or enhancement

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