If you need to decrement a loop in Python, then you can do the following:

How to Decrement a loop in Python using -1

The optional third argument you can pass to the range function is the order.

The default order is to count up / increment, while the -1 value, is to count down / decrement.

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for i in range(3, 0, -1):
  print(i)

Output: 3 2 1

How to Decrement a loop in Python using while

You can also use a while loop and set the value to the upper bound, and then decrement while in the loop itself.

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i = 3
while (i > 0):
  print(i)
  i = i-1

Output: 3 2 1