tvl-depot/scratch/data_structures_and_algorithms/string-reverse.py

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# swap :: Int -> Int -> [Char] -> IO ()
def swap(ia, iz, xs):
# handle swap when ia == iz
assert ia <= iz
xs[ia], xs[iz] = xs[iz], xs[ia]
# reverse :: [Char] -> IO ()
def reverse(xs):
ia = 0
iz = len(xs) - 1
while ia <= iz:
swap(ia, iz, xs)
ia += 1
iz -= 1
x = list("superduperpooper")
reverse(x)
print(x)
print("Tests pass")