emile wrote: > On 03/14/2015 11:24 AM, Peter Otten wrote: >> emile wrote: >> >>> On 03/14/2015 09:08 AM, Peter Otten wrote: > <snip> >>>> Why are you checking >>>> >>>> int(decval) >>> >>> >>> because it sure smells like int should work: >>> >>> (Pdb) "3"<decval<"5" >>> True >> >> That's a normal string comparison when decval is a string. This and the >> ValueError is expected Python behaviour: > > > yes -- but i'd previously shown decval to have a length of 1, and how > many things then fit that equation? > > <snip> > >>>> to get a meaningful traceback and post that. >>> >>> I don't get a traceback -- it spews: >>> >>> Fatal Python error: deletion of interned string failed >>> >>> This application has requested the Runtime to terminate it in an unusual >>> way. >>> Please contact the application's support team for more information. >>> >>> then crashes and I get a Microsoft pop-up that says python.exe has >>> encountered a problem and needs to close. >> >> That does look bad. Most likely an extension written in C corrupts the >> interpreter or it's even a bug in the interpreter itself. > > I'm tight on time the rest of the day, but I think I'll next zap all the > pyc versions, install a fresh 2.6.x python, and let it recompile. About > the only theory I have at the moment to explain the sudden failure after > years of non-failure is disk based bit-rot.
Probably not helpful, but I can provoke the behaviour you see by toggling bytes with ctypes, thus simulating a corrupted str object: Python 2.7.6 (default, Mar 22 2014, 22:59:56) [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import ctypes >>> s = "41.700000000000003" >>> ctypes.c_ubyte.from_address(id(s) + 16).value = 1 >>> s '4' >>> len(s) 1 >>> float(s) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid literal for float(): 41.700000000000003 >>> int(s) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid literal for int() with base 10: '41.700000000000003' -- https://mail.python.org/mailman/listinfo/python-list
