[issue21202] Naming a file` io.py` causes cryptic error message

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +ezio.melotti, ncoghlan
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21202>
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