Tempo wrote:
> Hello. I am getting the error that is displayed below, and I know
> exactly why it occurs. I posted some of my program's code below, and if
> you look at it you will see that the error terminates the program
> pre-maturely. Becasue of this pre-mature termination, the program is
> not able to execute it's final line of code, which is a very important
> line. The last line saves the Excel spreadsheet. So is there a way to
> make sure the last line executes? Thanks in advanced for all of the
> help. Thank you.
>
>
> Error
> ####
>
> IndexError: list index out of range
>
[snip]
Hi, Tempo, nice to see xlrd getting some usage :-)
Are you sure that you *really* want to save a spreadsheet written by
your buggy program??? It is better to fix errors, rather than ignore
them.
However, as you asked how: To ensure that cleanup code is executed no
matter what happens, use try/except/finally as in the following
example.
HTH,
John
C:\junk>type tempo.py
import sys
def main(n):
return (10 ** n) / n
try:
try:
print "executing the application ..."
n = int(sys.argv[1])
if n < 0:
# simulate something nasty happening ...
import nosuchmodule
else:
x = main(n)
print "app completed normally: %r" % x
except KeyboardInterrupt:
# need this to escape when n is large
print "kbd interrupt ...."
raise
except ZeroDivisionError:
print "doh!"
raise
finally:
# code to be executed no matter what happens
print "finally ... cleaning up"
C:\junk>tempo.py 0
executing the application ...
doh!
finally ... cleaning up
Traceback (most recent call last):
File "C:\junk\tempo.py", line 14, in ?
x = main(n)
File "C:\junk\tempo.py", line 4, in main
return (10 ** n) / n
ZeroDivisionError: integer division or modulo by zero
C:\junk>tempo.py -1
executing the application ...
finally ... cleaning up
Traceback (most recent call last):
File "C:\junk\tempo.py", line 12, in ?
import nosuchmodule
ImportError: No module named nosuchmodule
C:\junk>tempo.py 3
executing the application ...
app completed normally: 333
finally ... cleaning up
C:\junk>tempo.py 10000000000
executing the application ...
kbd interrupt ....
finally ... cleaning up
Traceback (most recent call last):
File "C:\junk\tempo.py", line 14, in ?
x = main(n)
File "C:\junk\tempo.py", line 4, in main
return (10 ** n) / n
KeyboardInterrupt
C:\junk>
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