"Asrarahmed Kadri" <[EMAIL PROTECTED]> wrote > *-s <IP address> -D <start date> -n <no. of days> -t <start time> > <end > time>* > > the first argument which is -s (for source) can be replaced by -d > (for > destination) or -o (for observer) or -r (for reporter). Now what I > want is > to make sure that the user only supplies one of the options from the > 4 > alternatives. >
I think you will need to hard-code the logic. Check to see which options have been defined and if more than one of the optional options exists print an error. if a and (b or c or d) or (b and (c or d)) or (c and d): print errorMessage Another way is to count the values: if len([val for val in [a,b,c,d] if val != None]) > 1: print errorMessage > My second question is about chekcing for None type. The issue is > that > optionParser sets the value = None for all the options that are not > specified by the user. So suppose if the user doesnt specify -t, > then time > would be set to None. How to check the None type. if x == None As simple as that. Alan G. _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
