A simple script to convert an hex to bytes based on endianess.

endian.py

#!/usr/bin/env python3

import argparse
import struct

def pack_address(address, arch, byte_order):
	_ = { 'x64' : { 'little' : '<Q', 'big' : '>Q' }, 'x86' : { 'little' : '<I', 'big' : '>Q' } }
	return struct.pack(_[arch][byte_order], address)

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-t', '--type', choices=['little', 'big'], default='little', help='Specify little or big')
    parser.add_argument('address', type=str, help='Address')
    parser.add_argument('-a', '--arch', choices=['x86', 'x64'], default='x86', help='Specify x86 or x64 (default: x86)')
    args = parser.parse_args()

    address_packed = pack_address(int(args.address, 16), args.arch, args.type)
    print(f'Packed address: {address_packed}')

if __name__ == '__main__':
    main()