[Python-Dev] new buffer in python2.7

Mon Nov 1 10:09:31 CET 2010

Ah, yes. There are, in my case. (why do I always seem to be doing stuff that is different from what you all are doing:)
The particular piece of code is from the chunked reader. It may be reading rather large chunks at a time (several lots of Kb.):
def recvchunk(socket):
 len = socket.unpack('i', recv_exactly(socket, 4))
 return recv_exactly(len)
#old style
def recv_exactly(socket, length):
 data = []
 while length:
 got = socket.receive(length)
 if not got: raise EOFError
 data.append(got)
 length -= len(got)
 return "".join(data)
#new style
def recv_exactly(socket, length):
 data = bytearray(length)
 view = memoryview(data)
 while length:
 got = socket.receive_into(view[-length:])
 if not got: raise EOFError
 length -= len(got)
 return data
Here I spot another optimzation oppertunity: let memoryview[:] return self, since the object is immutable, I believe.
K
> -----Original Message-----
> From: "Martin v. Löwis" [mailto:martin at v.loewis.de]
> Sent: 1. nóvember 2010 14:22
> To: Kristján Valur Jónsson
> Cc: python-dev at python.org
> Subject: Re: [Python-Dev] new buffer in python2.7
>>> Assuming there are multiple recv calls. For a typical struct, all data
> will come out of the stream with a single recv. so no join will be
> necessary.
>> Regards,
> Martin