将十进制转换成IEEE 754的十六进制

# Function for converting decimal to binary
def float_bin(my_number, places=3):
    my_whole, my_dec = str(my_number).split(".")
    my_whole = int(my_whole)
    res = (str(bin(my_whole)) + ".").replace('0b', '')

    for x in range(places):
        my_dec = str('0.') + str(my_dec)
        temp = '%1.20f' % (float(my_dec) * 2)
        my_whole, my_dec = temp.split(".")
        res += my_whole
    return res


def IEEE754(n):
    # identifying whether the number
    # is positive or negative
    sign = 0
    if n < 0:
        sign = 1
        n = n * (-1)
    p = 30
    # convert float to binary
    dec = float_bin(n, places=p)
    dotPlace = dec.find('.')
    onePlace = dec.find('1')
    # finding the mantissa
    if onePlace > dotPlace:
        dec = dec.replace(".", "")
        onePlace -= 1
        dotPlace -= 1
    elif onePlace < dotPlace:
        dec = dec.replace(".", "")
        dotPlace -= 1
    mantissa = dec[onePlace + 1:]

    # calculating the exponent(E)
    exponent = dotPlace - onePlace
    exponent_bits = exponent + 127
    # converting the exponent from
    # decimal to binary
    exponent_bits = bin(exponent_bits).replace("0b", '')
    mantissa = mantissa[0:23]
    # the IEEE754 notation in binary
    final = str(sign) + exponent_bits.zfill(8) + mantissa
    # convert the binary to hexadecimal
    hstr = '0x%0*X' % ((len(final) + 3) // 4, int(final, 2))
    return (hstr, final)


# Driver Code
if __name__ == "__main__":
    print(IEEE754(100.0))
    print(type(IEEE754(263.3)))
    print(IEEE754(-263.3))