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

[Vajrasky Kok]

Vajrasky Kok added the comment:

http://bugs.python.org/review/15204/diff/9032/Tools/iobench/iobench.py

Line 10 in New:
import io

But io module is never used.

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nosy: +vajrasky

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