[issue1152248] Add support for reading records with arbitrary separators to the standard IO stack

[Martin Panter]

Martin Panter added the comment:

Related:
* Issue 563491: 2002 proposal for parameter to readline, rejected at the time
* Issue 17083: Newline is hard coded for binary file readline

Fixing this issue for binary files would probably also satisfy Issue 17083.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1152248>
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