emile wrote: > On 03/14/2015 09:08 AM, Peter Otten wrote: >> emile wrote: >> >>> On 03/13/2015 08:09 PM, Chris Angelico wrote: >>>> On Sat, Mar 14, 2015 at 1:33 PM, Paul Rubin <no.email@nospam.invalid> >>>> wrote: >>>>> emile <em...@fenx.com> writes: >>>>>> *** NameError: name 'val' is not defined >>>>>> (Pdb) l >>>>>> 139 try: >>>>>> 140 val = round(float(decval),1) >>>>>> 141 except: >>>>>> 142 import pdb; pdb.set_trace() >>>>> >>>>> If 'float' or 'round' throw an exception, the assignment to 'val' >>>>> never >>>>> happens, so 'val' is undefined. Try examining the value of 'decval' >>>>> in the debugger to see what is making the conversion fail. >>>> >>>> That's exactly what the OP did :) Trouble is, it didn't help, because >>>> it sure looked as if decval was the string '4'. My best guess was - >>>> and is - that it's not just a string. We're looking at an SQL >>>> interface routine here, so it may be that there's a string subclass >>>> that length-limits itself, on the assumption that it's going into a >>>> fixed-length database field. >>> >>> It ran almost to completion before generating the error again -- >>> >>> (Pdb) decval >>> '4' >>> (Pdb) type(decval) >>> <type 'str'> >>> (Pdb) len(decval) >>> 1 >>> (Pdb) int(decval) >>> *** ValueError: invalid literal for int() with base 10: >>> '41.700000000000003' >>> >>> So there's still something amiss. >> >> 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: 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. >>> decval = "41.700000000000003" >>> "3" < decval < "5" True >>> int(decval) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid literal for int() with base 10: '41.700000000000003' >> when the actual failing expression is >> >> round(float(decval),1) >> >> ? Try to evaluate the latter in the debugger, and if that gives no clue >> change >> >>>>>> 139 try: >>>>>> 140 val = round(float(decval),1) >>>>>> 141 except: >>>>>> 142 import pdb; pdb.set_trace() >> >> to just >> >> val = round(float(decval), 1) >> >> 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. -- https://mail.python.org/mailman/listinfo/python-list
