digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9} def str2float(s): def char2num(c): return digits[c] data = s.split('.') integer = reduce(lambda x, y: x * 10 + y, map(char2num, data[0])) decimal = reduce(lambda x, y: x * 10 + y, map(char2num, data[1])) * 0.1**len(list(map(char2num, data[1]))) return integer + decimal
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