[docs] [issue35001] ImportFrom level cannot be optional

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

None is not integer. This field is optional:

>>> from ast import *
>>> x = Module(body=[ImportFrom(names=[alias(name='path', asname=None)], lineno=1, col_offset=0)])
>>> compile(x, '<string>', 'exec')
<code object <module> at 0x7f73b754da00, file "<string>", line 1>

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue35001>
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