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Refactor Python palindrome checker functions #6798

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Refactor Python palindrome checker functions #6798

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39 changes: 22 additions & 17 deletions code/string_algorithms/src/palindrome_checker/palindrome.py
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Original file line number Diff line number Diff line change
@@ -1,35 +1,40 @@
def isPalindromeRecursive(string):
if len(string) == 2 or len(string) == 1:
def is_palindrome_recursive(string):
if len(string) <= 1:
return True
if string[0] != string[len(string) - 1]:

if string[0] != string[-1]:
return False
return isPalindromeRecursive(string[1 : len(string) - 1])

return is_palindrome_recursive(string[1:-1])


def isPalindromeReverse(string):
def is_palindrome_reverse(string):
return string == string[::-1]


def isPalindromeIterative(string):
def is_palindrome_iterative(string):
start = 0
end = len(string) - 1

while start < end:
start = start + 1
end = end - 1
if string[start] != string[end]:
return False

start += 1
end -= 1

return True


if __name__ == "__main__":
print(isPalindromeRecursive("alpha")) # should output false
print(isPalindromeRecursive("racecar")) # should output true
print(isPalindromeRecursive("abba")) # should output true
print(is_palindrome_recursive("alpha")) # should output false
print(is_palindrome_recursive("racecar")) # should output true
print(is_palindrome_recursive("abba")) # should output true

print(isPalindromeReverse("alpha")) # should output false
print(isPalindromeReverse("racecar")) # should output true
print(isPalindromeReverse("abba")) # should output true
print(is_palindrome_reverse("alpha")) # should output false
print(is_palindrome_reverse("racecar")) # should output true
print(is_palindrome_reverse("abba")) # should output true

print(isPalindromeIterative("alpha")) # should output false
print(isPalindromeIterative("racecar")) # should output true
print(isPalindromeIterative("abba")) # should output true
print(is_palindrome_iterative("alpha")) # should output false
print(is_palindrome_iterative("racecar")) # should output true
print(is_palindrome_iterative("abba")) # should output true