DIGITS = dict((chr(ord('0') + val), val) for val in range(10)) # '0': 0, '1': 1 def str2float(s): loc = s.find('.') def char2num(s): return DIGITS[s] part1 = reduce(lambda x, y: x * 10 + y, map(char2num, s[:loc])) part2 = reduce(lambda x, y: x / 10 + y, map(char2num, s[-1:loc:-1])) return part1 + part2/10
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