thautwarm <yaoxiansa...@gmail.com> added the comment:

Firstly, allowing to construct ImportFrom without `level` specified could be 
the result of referring Python-asdl.

Secondly, in C level, `level` is always an integer.

Last but not the least, when you can access `level` from an ImportFrom AST, it 
must be an integer, not None.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35001>
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