[ python-Bugs-1221424 ] buffer() object broken.
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Fri Jun 17 21:04:18 CEST 2005
Bugs item #1221424, was opened at 2005-06-15 11:17
Message generated for change (Comment added) made by rjs_org
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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Ray Schumacher (rjs_org)
Assigned to: Neil Schemenauer (nascheme)
Summary: buffer() object broken.
Initial Comment:
Same as:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1033720&group_id=5470:
Still broken in 2.4.1...!
C:\projects\temp\fftw>python
ActivePython 2.4.1 Build 245 (ActiveState Corp.) based on
Python 2.4.1 (#65, Mar 30 2005, 09:33:37) [MSC v.1310
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for
more information.
>>> import Numeric
>>> i = Numeric.zeros(8)
>>> repr(buffer(i))
'<read-only buffer for 0x008D7200, size -1, offset 0 at
0x008D1B20>'
>>> repr(buffer(""))
'<read-only buffer for 0x0086A038, size -1, offset 0 at
0x008D1B20>'
(Numeric v23.8)
----------------------------------------------------------------------
>Comment By: Ray Schumacher (rjs_org)
Date: 2005-06-17 12:04
Message:
Logged In: YES
user_id=287034
In 2.3, the actual adress of the first element of an array
could be parsed for doing a memmove(), and now, not, which
breaks some older code. If this is a "more Pythonic"
feature, then OK; the previous resolution said "Fixed in
bufferobject.c 2.25." without remark. I assumed that it had
been restored to the previous.
I now have:
ptr = tpcnv[a.typecode()]()
pythonapi.PyObject_AsReadBuffer(py_object(a),
byref(ptr),
byref(c_int()))
ptr.refed_array = a
instead of:
split(repr(buffer(a)))[5][:-1]
to get/use an address with ctypes...
----------------------------------------------------------------------
Comment By: Neil Schemenauer (nascheme)
Date: 2005-06-17 10:52
Message:
Logged In: YES
user_id=35752
The repr of a buffer() object has indeed changed. I don't
see how that's a bug though.
----------------------------------------------------------------------
Comment By: Ray Schumacher (rjs_org)
Date: 2005-06-17 10:31
Message:
Logged In: YES
user_id=287034
repr(buffer("")) used to return:
<read-only buffer for 0x0086A038, ptr 0x008D0520, size 1 at
0x008D1B20>
now returns:
>>> repr(buffer(""))
'<read-only buffer for 0x0086A038, size -1, offset 0 at
0x008D1B20>'
same as:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1033720&group_id=5470
----------------------------------------------------------------------
Comment By: Neil Schemenauer (nascheme)
Date: 2005-06-16 11:49
Message:
Logged In: YES
user_id=35752
Please explain exactly what you think is broken about the
buffer object.
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1221424&group_id=5470
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