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reverse_string.py

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def recursive(s):

l = len(s)

if l < 2:

return s

return recursive(s[l//2:]) + recursive(s[:l//2])

def iterative(s):

r = list(s)

i, j = 0, len(s) - 1

while i < j:

r[i], r[j] = r[j], r[i]

i += 1

j -= 1

return "".join(r)

def pythonic(s):

r = list(reversed(s))

return "".join(r)

def ultra_pythonic(s):

return s[::-1]