[issue47092] [C API] Add PyFrame_GetVar(frame, name) function

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Currently, Tools/gdb/libpython.py uses PyFramePtr.iter_locals() which iterates on PyFrameObject.f_frame.localsplus.

There is a PyFramePtr.get_var_by_name() function which only checks for frame variables in PyFrameObject.f_frame.localsplus, or look up in globals and builtins. So it only supports some kinds of variables.

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<https://bugs.python.org/issue47092>
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