New submission from Andrew Dalke <da...@dalkescientific.com>:
In Python 2.6 and Python 2.7a2+, I can't socket.recv_into(a byte array
instance).
I get a TypeError which complains about a "pinned buffer". I have only an
inkling of what that means. Since an array.array("b") works there, and since
it works in Python 3.1.1, and since I thought the point of a bytearray was to
make things like recv_into easier, I think this exception is a bug in Python
2.6 and 2.7.
Here's my reproducibles:
Python 2.6.1 (r261:67515, Jul 7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> sock = socket.socket()
>>> sock.connect( ("python.org", 80) )
>>> sock.send(b"GET / HTTP/1.0\r\n\r\n")
18
>>> buf = bytearray(b" " * 10)
>>> sock.recv_into(buf)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: recv_into() argument 1 must be pinned buffer, not bytearray
I expected a bytearray to work there. In fact, I thought the point of
bytearray was to allow this to work.
By comparison, an array of bytes does work:
>>> import array
>>> arr = array.array("b")
>>> arr.extend(map(ord, "This is a test"))
>>> len(arr)
14
>>> sock.recv_into(arr)
14
>>> arr
array('b', [72, 84, 84, 80, 47, 49, 46, 49, 32, 51, 48, 50, 32, 70])
>>> "".join(map(chr, arr))
'HTTP/1.1 302 F'
I don't even know what a "pinned buffer" means, and searching
python.org isn't helpful.
Using a bytearray in Python 3.1.1 *does* work:
Python 3.1.1 (r311:74480, Jan 31 2010, 23:07:16)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> sock = socket.socket()
>>> sock.connect( ("python.org", 80) )
>>> sock.send(b"GET / HTTP/1.0\r\n\r\n")
18
>>> buf = bytearray(b" " * 10)
>>> sock.recv_into(buf)
10
>>> buf
bytearray(b'HTTP/1.1 3')
For reference, here's an example with 2.7a2+ (freshly built out of version
control) showing that it does not work there.
Python 2.7a2+ (trunk:74969:77901M, Feb 1 2010, 02:44:24)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> sock = socket.socket()
>>> sock.connect( ("python.org", 80) )
>>> b = bytearray(b" " * 10)
>>> sock.recv_into(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: recv_into() argument 1 must be pinned buffer, not bytearray
>>>
----------
components: IO
messages: 98644
nosy: dalke
severity: normal
status: open
title: recv_into() argument 1 must be pinned buffer, not bytearray
type: behavior
versions: Python 2.6, Python 2.7
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7827>
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