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Example of script.py:
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class Bla:
 def __del__(self):
 try:
 import xxxx
 except Exception as exc:
 print("import error: [%s] %r" % (type(exc), exc))
bla = Bla()
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Running this example logs a strange error:
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$ python3.5 script.py
import error: [<class 'TypeError'>] TypeError("'NoneType' object is not iterable",)
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The error comes from importlib._bootstrap._find_spec() which tries to iterator on sys.meta_path, whereas PyImport_Cleanup() was called and this function setted sys.meta_path to None.
Attached patch enhances _find_spec() to handle this case to return None. Error with the patch:
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$ python3.5 script.py
import error: [<class 'ImportError'>] ImportError('sys.meta_path is None, Python is likely shutting down',)
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