O> > while cal <=0:
> > #Prompt for calories
> > cal = input("Please enter the number of calories in your food: ")
> > if cal <=0:
> > print "Error. The number of calories must be positive."
>
> > #Prompt for fat
> > fat = input("Please enter the number of fat grams in your food: ")
> > if fat <=0:
> > print "Error. The number of fat grams must be positive."
You can also use a function
def get_value( lit ):
ret_val = 0
while ret_val <= 0:
ret_val = input("Please enter the number of %s in your food: "
% (lit))
if ret_val <=0:
print "Error. The number of %s must be positive." % (lit)
return ret_val
#
cal = get_value( "calories" )
fat = get_value( "fat grams" )
##
## Calculate values, etc.
--
http://mail.python.org/mailman/listinfo/python-list
