eryksun added the comment:
> you can't overwrite a io.FileIO().name attribute
A FileIO instance uses a dict for 'name' (msg214670):
>>> vars(sys.stdin.buffer.raw)
{'name': '<stdin>'}
>>> f = tempfile.TemporaryFile()
>>> vars(f.raw)
{'name': 3}
The name is optional meta-information. If it gets deleted, the repr falls back
on using the file descriptor:
>>> f.raw
<_io.FileIO name=3 mode='rb+'>
>>> del f.raw.name
>>> f.raw
<_io.FileIO fd=3 mode='rb+'>
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<http://bugs.python.org/issue21044>
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