Changing the value of range during iteration in Python

Question

>>> k = 8
>>> for i in range(k):
        print i
        k -= 3
        print k

Above the is the code which prints numbers from <

Answer 1

If you do want to change k and affect the loop you need to make sure you are iterating over mutable object. For example:

k = list(range(8))
for i in k:
        print(i)
        k.pop()
        k.pop()
        k.pop()
        print(k)

Or alternatively:

k = list(range(8))
for i in k:
        print(i)
        k[:] = k[:-3]
        print(k)

Both will result with

0
[0, 1, 2, 3, 4]
1
[0, 1]