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Second solution in Creative category for The Most Wanted Letter by enagorny
# migrated from python 2.7
checkio = lambda text: max(set([x for x in text.lower() if x in 'abcdefghijklmnopqrstuvwxyz']), key=text.lower().count)
#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. 27, 2014