[issue21859] Add Python implementation of FileIO

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Restored first os.fstat() (however it now is redundant) and addressed most other Victor's comments.

In general I prefer EAFP over BDFL, and often "except AttributeError" looks better to me than getattr().

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Added file: http://bugs.python.org/file38653/pyio_fileio_8.patch

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