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

[STINNER Victor]

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

> In Python 3.10, it's possible to call PyFrame_FastToLocalsWithError() on a frame to get all variables as a dictionary.

In 2018, it was decided to *not* document this function: see bpo-19431.

In C, It is possible to call PyObject_GetAttrString(frame, "f_locals") to call indirectly _PyFrame_FastToLocalsWithError() and get the dictionary.

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