[issue1351] Add getsize() to io instances

[Martin v. Löwis]

Martin v. Löwis added the comment:

I'm skeptical:

- If you add getsize, why not getlastchangeddate, getowner, getpermissions?

- in general, streams (which really is the interface for file-like
objects) don't have the notion of "size"; only some do.

- what is the purpose of the f.tell fragment? ie. why could that work
when fstat doesn't?

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nosy: +loewis

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