>>> import sys
>>> sys.version
'2.0c1 (#7, Jan 24 2001, 15:36:12) [C]'
>>> s = "123"
>>> s.replace("123","")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
MemoryError
>>> os.uname()
('OSF1', 'xxx', 'V4.0', '1229', 'alpha')
>>> 


I haven't tried it with anything newer, perhaps this
bug
has already been posted and/or fixed, though I couldn't
find it in the buglist

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Works for me.  Please try recompiling with optimization 
turned off.  If that makes the problem go away (seems 
likely to me), it's a platform compiler bug.

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FWIW, I can (a) reproduce this on alpha/OSF1 (recompiling
stringobject.c without optimizations makes no odds,
recompiling all of Python takes too long on this particular
alpha) (b) make it go away by replacing the call to
PyMem_MALLOC in mymemreplace with one to PyMem_Malloc.

The difference is that PyMem_Malloc(0) can't be NULL;
PyMem_MALLOC can.

So either do this, or check if new_len is zero and return
PyString_FromString("") or something (in mymemreplace).

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FWIW, I can (a) reproduce this on alpha/OSF1 (recompiling
stringobject.c without optimizations makes no odds,
recompiling all of Python takes too long on this particular
alpha) (b) make it go away by replacing the call to
PyMem_MALLOC in mymemreplace with one to PyMem_Malloc.

The difference is that PyMem_Malloc(0) can't be NULL;
PyMem_MALLOC can.

So either do this, or check if new_len is zero and return
PyString_FromString("") or something (in mymemreplace).

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Good eye, Michael!  I've checked in what I hope will be a 
fix:

Lib/test/string_tests.py new revision: 1.8
Modules/stropmodule.c new revision: 2.77

Please give that a try and let me know whether it fixes the 
problem on this box.

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yep, fixes it.  doesn't fix strop, but I think that's
deliberate?

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Sorry, don't know what "doesn't fix strop" means.  What's 
broken in strop?  The test case didn't use strop (although 
I mentioned stropmodule.c in a comment).  Closing the bug 
assuming this is some misunderstanding that's not worth the 
time to straighten out <0.7 wink>; please re-open if you 
think it is.

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I meant:

Python 2.2a0 (#3, May 10 2001, 07:57:08) [C] on osf1V4
Type "copyright", "credits" or "license" for more information.
>>> import strop
>>> strop.replace("123","123","")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
MemoryError

as I said, I thought this was expected, but thought I'd check (I 
did put a comment in yesterday that explained what I meant more
thouroughly, but sf ate it).

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Ah!  No, I do NOT expect that.  The copies of mymemreplace
() in stringobject.c and stropmodule.c were (eventually) 
both replaced, and that was the source of the MemoryError.  
Did you have up-to-date versions of both?  If so, this is 
some other bug!  The only occurrence of PyMem_MALLOC() in 
stropmodule.c "got fixed".

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doh! i'd only updated stringobject.c.

sorry for being a doofus.  it all works now.

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I made the suggested changes and things are now working
grand! thanks guys.