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Palindrome

Checks if the given string is a palindrome.

Use str.lower() and re.sub() to convert to lowercase and remove non-alphanumeric characters from the given string.
Then, compare the new string with its reverse, using slice notation.

from re import sub

def palindrome(s):
  s = sub('[\W_]', '', s.lower())
  return s == s[::-1]

palindrome('taco cat') # True

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