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david.white@denison.edu cs112fall2015 > is_palindrome
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A palindrome is a word or phrase that reads the same forward or backward. Only the letters count (not any spaces or punctuation), and a lowercase letter matches an uppercase one. So "Race car!" is a palindrome. Write the function is_palindrome that returns True only for strings that are palindromes.


is_palindrome('radar') → True
is_palindrome('Radar!!') → True
is_palindrome('radio') → False

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def is_palindrome(phrase):

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