Created
May 31, 2017 14:13
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| history = [] | |
| def happy(number): | |
| next_ = sum(int(n) ** 2 for n in str(number)) | |
| # stop condition | |
| if next_ == 1: | |
| return True | |
| elif next_ in history: | |
| return False | |
| history.append(next_) | |
| return happy(next_) | |
| assert happy(1) | |
| assert happy(10) | |
| assert happy(100) | |
| assert happy(130) | |
| assert not happy(123) | |
| assert not happy(4) |
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