little= int.from_bytes(bytes('ab', encoding='utf8'), 'little')
big = int.from_bytes(bytes('ab', encoding='utf8'), 'big')
print('little: {:0>16b}'.format(little))
print('big: {:0>16b}'.format(big))
print('a: {:0>8b}'.format(ord('a')))
print('b: {:0>8b}'.format(ord('b')))

# little: 01100010 01100001 小端就是小值放在低地址位
# big: 01100001 01100010
# a: 01100001
# b: 01100010