[docs] [issue15204] Deprecate the 'U' open mode

[Василий Макаров]

Василий Макаров added the comment:

open() documentation is probably broken a little now. Here is what one can see at the end of open() description:
"...
Deprecated since version 3.4, will be removed in version 4.0.

The 'U' mode."

Reader may assume open() function is what will be removed. Which is frightening :)

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nosy: +Василий.Макаров

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15204>
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