At 10:15 AM 12/23/2005, Panagiotis Atmatzidis wrote: >Hello, > >Can someone provide me with an error checking example about an x >variable that needs to be number only? I used something like: > > def useridf(): > print "" > print "WARNING: If you don't understand why this must be unique, >exit and read the manual."
You ask the user to exit but you don't tell him how to do that! > print "" > userid = input("x : ") > >I know that "input" accepts only numbers How did you "know" that? Try this: print input("x ; ") and enter "Hello world" Truth is input() "accepts" anything and attempts to evaluate it as a Python expression. If that fails it raises an exception. You should use raw_input() instead. This takes any input and returns it as a character string. x = raw_input("x : ") if x.isdigit(): # ensure input is a number y = int(x) # convert to integer else: print 'Boo" >, but I don't want the program >to break if someone puts other chars in it. I want to, print "Only >numbers are accepted." which is easy. But still I can't understand how >to do the check using if/elif/else statements. _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor