Question

I’ve been reading up a lot on stuct.pack and hex and the like.

I am trying to convert a decimal to hexidecimal with 2-bytes. Reverse the hex bit order, then convert it back into decimal.

I’m trying to follow these steps…in python

Convert the decimal value **36895** to the equivalent 2-byte hexadecimal value:

**0x901F**
Reverse the order of the 2 hexadecimal bytes:

**0x1F90**
Convert the resulting 2-byte hexadecimal value to its decimal equivalent:

**8080**

Answer 1

Bit shifting to swap upper/lower eight bits:

>>> x = 36895
>>> ((x << 8) | (x >> 8)) & 0xFFFF
8080

Packing and unpacking unsigned short(H) with opposite endianness(<>):

>>> struct.unpack('<H',struct.pack('>H',x))[0]
8080

Convert 2-byte little-endian to big-endian…

>>> int.from_bytes(x.to_bytes(2,'little'),'big')
8080