[issue47204] Ensure PyEval_GetGlobals() doesn't set an exception when returning NULL

[Nick Coghlan]

Nick Coghlan  added the comment:

Core dev forum thread for the C API question: 
https://discuss.python.org/t/subtle-c-api-discrepancy-pyeval-getlocals-vs-pyeval-getglobals-with-no-python-frame/14797

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[issue47204] Ensure PyEval_GetGlobals() doesn't set an exception when returning NULL

[Nick Coghlan]

New submission from Nick Coghlan :

While working on the first PR for bpo-44800 I provoked an obscure failure in 
PyImport_ImportModule by making PyEval_GetGlobals set an exception when 
returning NULL (as PyEval_GetLocals has done since bpo-18408 was implemented 
for Python 3.4).

This ticket covers adding an embedding test case that:

* ensures PyEval_GetGlobals() returns NULL without an exception when no Python 
frame is active
* ensures PyEval_GetLocals() returns NULL and sets an exception when no Python 
frame is active
* ensures PyImport_ImportModule still works when no Python frame is active

There's an option to slightly change the behaviour of `PyEval_GetLocals()` to 
NOT set an exception in the "no Python frame" case, and instead only set the 
error when there is a Python frame, but something goes wrong when attempting to 
access the fast locals array (such as a memory allocation failure).

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assignee: ncoghlan
messages: 416611
nosy: ncoghlan
priority: normal
severity: normal
stage: test needed
status: open
title: Ensure PyEval_GetGlobals() doesn't set an exception when returning NULL
type: enhancement

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