Created
September 22, 2016 23:54
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Happy Numbers
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| def happy(number): | |
| if number < 10: | |
| return number in (1,7) | |
| next_ = sum(int(char) ** 2 for char in str(number)) | |
| return happy(next_) | |
| assert all([happy(n) for n in (1, 10, 100, 130, 97)]) | |
| assert not all([happy(4) for n in (2,3,4,5,6,8,9)]) |
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