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one-liner, imported string solution in Uncategorized category for The Most Wanted Letter by indorilftw
import string
checkio = lambda s: max(string.ascii_lowercase, key=lambda x: s.lower().count(x))
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio("Hello World!") == "l", "Hello test"
assert checkio("How do you do?") == "o", "O is most wanted"
assert checkio("One") == "e", "All letter only once."
assert checkio("Oops!") == "o", "Don't forget about lower case."
assert checkio("AAaooo!!!!") == "a", "Only letters."
Feb. 12, 2014