Python, how to decode Binary coded decimal (BCD)

Question

Description of the binary field is:

Caller number, expressed with compressed BCD code, and the surplus bits are filled with “0xF”

Answer 1

Python 3.x has this built-in for bytes objects.

>>> c = b'3\x00\x02\x05\x15\x13GO\xff\xff\xff\xff\xff\xff\xff\xff'
>>> c.hex()
'330002051513474fffffffffffffffff'

And back:

>>> c = "9F1A020840"
>>> bytes.fromhex(c)
b'\x9f\x1a\x02\x08@'