> x = raw_input("x : ") > if x.isdigit(): # ensure input is a number > y = int(x) # convert to integer > else: > print 'Boo"
Hello Bob and Panagiotis, It might be good to make this number-reading thing a function, just to make it easier to reuse (and test!) it. Let's call this input_number() for the moment. ####################################################### def input_number(prompt): """Reads an integer from the next line of input.""" while 1: x = raw_input(prompt) if x.isdigit(): return int(x) else: print 'Boo' ####################################################### Does this work? Let's try it informally: ###### >>> input_number('number please: ') number please: 1 1 >>> input_number('number please: ') number please: 1234 1234 >>> input_number('number please: ') number please: 1st Boo number please: 74 74 >>> ###### I added one more behavior so that input_number continues to ask until it's satisified by a number. Hope this helps! _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor