[issue42990] Improve the C code for calling Python code: _PyEval_EvalCode()

[STINNER Victor]

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

I rephrased PR 24564 to clarify the scope of the incompatible change: in practice, only the types.FunctionType constructor changes.

Defining functions in Python using "def function(...): ...", eval(code, {}) and exec(code, {}) are not affected. eval() and exec() already inherit the current builtins if globals does not contain "__builtins__" key.

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<https://bugs.python.org/issue42990>
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