[Python-Dev] Adding bytes.frombuffer() constructor to PEP 467

[Antoine Pitrou]

On Thu, 5 Jan 2017 20:28:26 -0500
Yury Selivanov <yselivanov.ml at gmail.com> wrote:
> On 2017-01-05 7:11 PM, INADA Naoki wrote:
> >> bytes.frombuffer(x) is bytes(memoryview(x)) or memoryview(x).tobytes().
> >>  
> > There is pitfall: memoryview should be closed.
> > So b = bytes.frombuffer(x) is:
> >
> > with memoryview(x) as m:
> >      b = bytes(m)
> >      # or b = m.tobytes()  
> 
> Thinking more about this, and after looking at my own code in asyncpg 
> and uvloop, I'm now in favor of adding bytes.frombuffer() with the 
> proposed signature: ``bytes.frombuffer(byteslike, length=-1, offset=0)``

+1

Note this matches numpy.frombuffer():

"""
frombuffer(buffer, dtype=float, count=-1, offset=0)

Interpret a buffer as a 1-dimensional array.
"""

Regards

Antoine.