Is it possible to implement pre- or post-conditions in Python loops, and how?

Python does not have built-in precondition (like while) and postcondition (like do-while in other languages) loops, but both can be implemented.

• A precondition loop is a regular while that checks the condition before each iteration:

while condition:
    # loop body

• A postcondition loop (similar to do-while) can be simulated using an infinite loop with a condition check inside:

while True:
    # loop body
    if not condition:
        break

Thus, in Python, precondition loops are directly implemented with while, and postcondition loops with while True and break.