"""Soundex algorithmThis program is part of "Dive Into Python", a free Python book forexperienced programmers.  Visit http://diveintopython.org/ for thelatest version."""__author__ = "Mark Pilgrim (mark@diveintopython.org)"__version__ = "$Revision: 1.3 $"__date__ = "$Date: 2004/05/11 19:11:21 $"__copyright__ = "Copyright (c) 2004 Mark Pilgrim"__license__ = "Python"import stringallChar = string.uppercase + string.lowercasecharToSoundex = string.maketrans(allChar, "91239129922455912623919292" * 2)def soundex(source):    "convert string to Soundex equivalent"    # Soundex requirements:    # source string must be at least 1 character    # and must consist entirely of letters    if (not source) or (not source.isalpha()):        return "0000"    # Soundex algorithm:    # 1. make first character uppercase    # 2. translate all other characters to Soundex digits    digits = source[0].upper() + source[1:].translate(charToSoundex)    # 3. remove consecutive duplicates    digits2 = digits[0]    for d in digits[1:]:        if digits2[-1] != d:            digits2 += d            # 4. remove all "9"s    digits3 = ''    for d in digits2:        if d != '9':            digits3 += d        # 5. pad end with "0"s to 4 characters    while len(digits3) < 4:        digits3 += "0"            # 6. return first 4 characters    return digits3[:4]if __name__ == '__main__':    from timeit import Timer    names = ('Woo', 'Pilgrim', 'Flingjingwaller')    for name in names:        statement = "soundex('%s')" % name        t = Timer(statement, "from __main__ import soundex")        print name.ljust(15), soundex(name), min(t.repeat())