hex variables in python

Question

I am defining a byte array in python and the same value shows up multiple times and I would like to replace that value by a variable. Here's an example of a similar code:

btarray = bytearray([
    0xa9, 0x01,
    0x6d, 0x01
])

I want to, instead of writing 0x01 all the time, just write x, might the following be working?

x = 0x01

btarray = bytearray([
    0xa9, x,
    0x6d, x
])

Is it possible?

Answer 1

I finally understood your question! The answer is yes , Unfortunately I don't have any documentation to link to. since this is quite basic and low-level.

Answer 2

Yes you can, Just like any other array. Bytearray is iterable: So you could do something like this:

x = someByteValue
for n,i in enumerate(btarray):
       if i == 0x01:
              btarray[n] = x

Another way would be to use a simple for loop:

x = someByteValue
for i in range(len(btarray)):
       if btarray[i] == 0x01:
              btarray[i] = x