[docs] [issue21763] Clarify requirements for file-like objects

[Nikolaus Rath]

New submission from Nikolaus Rath:

It is currently not perfectly clear what Python (and the standard library) assumes about file-like objects (see e.g. http://article.gmane.org/gmane.comp.python.devel/148199).

The attached doc patch tries to improve the current situation by  stating explicitly that the description of IOBase et al specifies a *mandatory* interface for anything that claims to be file-like.

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assignee: docs at python
components: Documentation
files: iobase.diff
keywords: patch
messages: 220588
nosy: benjamin.peterson, docs at python, eric.araujo, ezio.melotti, georg.brandl, hynek, ncoghlan, nikratio, pitrou, stutzbach
priority: normal
severity: normal
status: open
title: Clarify requirements for file-like objects
type: enhancement
versions: Python 3.4, Python 3.5
Added file: http://bugs.python.org/file35636/iobase.diff

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