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Soundex algorithm
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| def soundex(string): | |
| # keep first letter of a string | |
| string = string.lower() | |
| result = string[0] | |
| string = string[1:] | |
| # remove [a, e, i, o, u, y, h, w] | |
| tmp = ['a', 'e', 'i', 'o', 'u', 'y', 'h', 'w'] | |
| for t in tmp: | |
| if t in string: | |
| string.replace(t, '') | |
| # Replace all consonants from position 2 onwards with digits using these rules: | |
| dicts = {'bfpv': 1, | |
| 'cgjkqsxz': 2, | |
| 'dt': 3, | |
| 'l':4, | |
| 'mn':5, | |
| 'r':6} | |
| for c in string: | |
| for k in dicts: | |
| if c in k: | |
| result += str(dicts[k]) | |
| # only keep unique adjacent digits | |
| # return 4 | |
| return result[:4].ljust(4, '0') | |
| def test(): | |
| assert soundex('gail') == 'g400' | |
| assert soundex('christine') == 'c623' | |
| assert soundex('kristina') == 'k623' | |
| assert soundex('peter') == 'p360' | |
| assert soundex('gayle') == 'g400' | |
| assert soundex('christina') == 'c623' | |
| assert soundex('kirstin') == 'k623' | |
| assert soundex('christen') == 'c623' | |
| print(soundex('Brian')) | |
| print(soundex('Elizabeth')) | |
| test() |
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