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First solution in Clear category for The Most Wanted Letter by mshuffett
from collections import defaultdict
def checkio(text):
counts = defaultdict(lambda: 0)
for c in text:
if c.isalpha():
counts[c.lower()] += 1
chars = sorted(counts)
chars.sort(key=lambda x: counts[x], reverse=True)
return chars[0]
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
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."
assert checkio("abe") == "a", "The First."
print("Start the long test")
assert checkio("a" * 9000 + "b" * 1000) == "a", "Long."
print("The local tests are done.")
Sept. 30, 2015
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