average_word_length("A B C.") ➞ 1.00

average_word_length("What a gorgeous day.") ➞ 4.00

average_word_length("Dude, this is so awesome!") ➞ 3.80

self.assertEqual(average_word_length("A B C."), 1.00)
self.assertEqual(average_word_length("What a gorgeous day."), 4.00)
self.assertEqual(average_word_length("Dude, this is so awesome!"), 3.80)
self.assertEqual(average_word_length('Working on my tan right now.'), 3.67)
self.assertEqual(average_word_length('Having a blast partying in Las Vegas.'), 4.29)
self.assertEqual(average_word_length('Have you ever wondered what Saturn looks like?'), 4.75)
self.assertEqual(average_word_length('I just planted a young oak tree, wonder how tall it will grow in a few years?'), 3.47)

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