Question

I don't get the program at the end of lecture 3.

http://dpaste.com/603441/

why is the result 17?

Answer 1

The function is summing the digits of the string, so 1+9+5+2 = 17

Answer 2

sumDigits = 0

for c in str(1952):
sumDigits += int(c)
print sumDigits

yeah, the for loop takes each digit, starting with the first and adds it to the previous, then prints the final result after the loop ends.
sumDigits equals 1 on the first go around, then it equals 1 + 9 (10), then 10 + 5, etc.