[issue20284] patch to implement PEP 461 (%-interpolation for bytes)

[STINNER Victor]

STINNER Victor added the comment:

I will not have to work on optimization before the alpha 1 (February 8, 2015).

Ethan: just commit your patch when you consider that it's ready to be
merged, we will have time to refactor and enhance the code later.

IMO it's more important to have the feature in alpha 1 than having
perfect code, because some developer are waiting for this feature and
will have more time to provide feedback.

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