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Fri May 27 05:49:08 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-May/144735.html

Could anyone please clarify whether it is correct in python3.5 to call
PyImport_AppendInittab() after Py_Initialize()

I found this case among the tests for boost.python
https://github.com/boostorg/python/blob/develop/test/exec.cpp

And this test doesn't work for me with python3.5.An error looks like:

exec.cpp(137): Python Error detected in function 'void __cdecl
check_pyerr(bool)'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: 'embedded_hello' is not a built-in module
1 error detected.

After debugging I found out that root cause is in
importlib/_bootstrap.py which do the following:

        if fullname not in sys.builtin_module_names:
            raise ImportError('{!r} is not a built-in
module'.format(fullname), name=fullname)

but sys.builtin_module_names is the constant which initialized once in
Py_Initialize()

---
To summarize:
Is it a bug in python3.5 or original test inside boost.python should be
fixed ?
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[Python-Dev] embedding - PyImport_AppendInittab() after Py_Initialize()