import struct


def intToHex(num):  # int转16进制
    return hex(num)[2:].upper()

def hexToInt(hexString):  # 16进制转int
    return int(hexString, 16)

def floatToHex(floatValue):  # float转16进制
    return struct.pack('>f', floatValue).hex().upper()

def hexToFloat(hexString):  # 16进制转float
    return struct.unpack('>f', bytes.fromhex(hexString))[0]

def doubleToHex(doubleValue):  # double转16进制
    return struct.pack('>d', doubleValue).hex().upper()

def hexToDouble(hexString):  # 16进制转double
    return struct.unpack('>d', bytes.fromhex(hexString))[0]

if __name__ == '__main__':
    print(intToHex(1000), hexToInt("3E8"))
    print(floatToHex(1.0), hexToFloat("3F800000"))
    print(doubleToHex(1.00), hexToDouble("3FF0000000000000"))

结果：