[issue20074] open() of read-write non-seekable streams broken

[Dolda2000]

Dolda2000 added the comment:

>So the question is, is the *design* of the IO module that '+' requires a seekable stream the best behavior, or can that constraint be relaxed?

What purpose does that constraint serve? Is there any reason it shouldn't be relaxed?

It seems to work quite well without it in Python 2.

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<http://bugs.python.org/issue20074>
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