Control flow

Conditions

if score > 10:
    say("high")
elif score:
    say("positive")
else:
    say("zero")

For integers, zero is false and every other value is true. Empty strings and collections are false when converted with bool.

For loops

for item in items:
    say(item)

A loop compiles into a helper function that recursively schedules its next iteration.

While loops

while remaining > 0:
    remaining = remaining - 1

The condition is reevaluated before each recursive iteration.

Loop control

break exits the nearest loop. continue skips to its next iteration. Returns propagate correctly through generated loop and branch helpers.