[Python-bugs-list] [Bug #121013] Bug in <stringobject>.join(<unicodestring>)

[noreply@sourceforge.net]

Bug #121013, was updated on 2000-Nov-01 10:17
Here is a current snapshot of the bug.

Project: Python
Category: Modules
Status: Closed
Resolution: None
Bug Group: None
Priority: 7
Summary: Bug in <stringobject>.join(<unicodestring>)

Details: Python 2.0 (#8, Oct 16 2000, 17:27:58) [MSC 32 bit (Intel)] on win32
Type "copyright", "credits" or "license" for more information.
IDLE 0.6 -- press F1 for help
>>> import codecs
>>> f = codecs.open("c:\\temp\\junk.txt", "w", "UTF-8")
>>> msg = u"this is a test"
>>> f.writelines(msg)

result:
The instruction at "0x002925a6 referenced memory at "0x00000000".  The memory could not be "read".

Follow-Ups:

Date: 2000-Nov-01 11:06
By: lemburg

Comment:
The bug headline is misleading: the bug boils down to

""..join(u"this is a test")

causing a segfault. (Note that you should pass a list to .join()... not
a string.

The cause is the PySequence_Fast_GET_ITEM() macro:

#define PySequence_Fast_GET_ITEM(o, i)\
     (PyList_Check(o) ? PyList_GET_ITEM(o, i) : PyTuple_GET_ITEM(o, i))

... this only works for lists and tuples and not arbitrary sequences like
the name implies.

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Date: 2000-Nov-01 14:39
By: jhylton

Comment:
I think the cause is whatever uses the PySequence_Fast_GET_ITEM macro (which may have a misleading name).

It looks like it might also be useful to raise an exception when join is passed a string.  I think it's more likely to be an error than deliberate.

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Date: 2000-Nov-27 10:12
By: mwh

Comment:
I hope you're all suitably embarrassed - please see patch #102548 for the trivial fix...
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Date: 2000-Nov-27 10:54
By: gvanrossum

Comment:
Patch checked in.
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http://sourceforge.net/bugs/?func=detailbug&bug_id=121013&group_id=5470