python - simple calculation with bytes

Hi! I need two python functions, which accept an integer with 13 bits (enumerated as 0123456789abc, where for example 4 is the fifth bit and a is the 11th bit) and an integer with 4 bits (enumerated as ABCD). These bits should be concatenated four times and at the end the other 4 bits, so like this: 01234567 89abc012 3456789a bc012345 6789abc0 12345678 9abcABCD The first function should return these 7 bytes in an array and the second function should return these 7 bytes but with the left and right half reversed, so like this: 45670123 c01289ab 789a3456 2345bc01 abc06789 56781234 ABCD9abc Thank you :-)