On Tue, Dec 10, 2013 at 10:39:34AM +0100, Rafael Knuth wrote: > def DigSum (integer): > s = 0 > while integer != 0: > integer, remainder = divmod(integer, 10) > s += remainder > print(s)
A thought comes to mind... an very important lesson is to learn the difference between return and print, and to prefer return. You have written a function that calculates the digit sum. But it is not *reusable* in other functions, since it cannot do anything but *print* the digit sum. What if you want to store the result in a variable, and print it later? Or print it twice? Or put it in a list? Or add one to it? You're screwed, the function is no use to you at all. This is because the function does *two things*, when it should do one. First it calculates the digit sum, and then it prints it. My advice is, (nearly) always use return, not print, inside functions. Once you return a result, it is easy to print it if you so desire: print(digit_sum(23)) Or do anything else: x = digit_sum(42952) y = digit_sum(1032897) + digit_sum(8234) z = [1, 2, digit_sum(99742), 3] but you can't do anything *but* print if your function automatically calls print. -- Steven _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
