def char2num(i):

        digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}

        return digits[i]

    def fn(x, y):

        return x * 10 + y

    list1 = s.split('.',2)

    L = len(list1[1])

    m = reduce(fn,map(char2num,list1[0]))

    n = reduce(fn,map(char2num,list1[1]))

    s1 = m+(n*0.1**L)

    return s1