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[Python-Dev] O(1) deletes from the front of bytearray (was: Re: Adding bytes.frombuffer() constructor to PEP 467 (was: [Python-ideas] Adding bytes.frombuffer() constructor)

Victor Stinner victor.stinner at gmail.com
Wed Oct 12 07:55:34 EDT 2016 
2016-10-12 10:01 GMT+02:00 Nathaniel Smith <njs at pobox.com>:
> It's more complicated than that -- the right algorithm is the one that
> Antoine implemented in 3.4.
> (...)
> My point is that
> forcing everyone who writes network code in Python to do that is
> silly, especially given that CPython's apparently been shipping this
> feature for years.

"For years" means since March 2014, Python 3.4.0 release, so 2 years ago.

We can document the optimization as a CPython implementation detail
and explain that it's only in Python >= 3.4.

So an application which should work on Python 2.7 as well cannot rely
on this optimization for example.

Victor
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