Why doesn't this loop break?

Question

Python noob; please explain why this loop doesn\'t exit.

for i in range(0,10):
  print \"Hello, World!\"
  if i == 5: i = 15
  print i
next

Answer 1

Because Python's for loop doesn't count, it iterates. range produces an iterable (a list in Python 2.x), and that iterable is iterated over. Each time before the loop body is executed, the next item is pulled from it, and no changes you make in the loop body to the iteration variable affect the memory of what the next value is supposed to be. That's saved elsewhere and you generally can't affect it. Simply use break.