How to get the raw bytes from a hex string in python

Question

I have the following problem in python

I have the value 0x402de4a in hex and would like to convert it to bytes so I use .to_bytes(3, 'little') which gives me b'J\2d@' if I print it. I am aware that this is just a representation of the bytes but I need to turn a string later for the output which would give me J\2d@ if I use str() nut I need it to be \x4a\x2d\x40 how can I convert the byte object to string so I can get the raw binary data as a string

my code is as follows

addr = 0x402d4a
addr = int(addr,16)

addr = str(addr.to_bytes(3,'little'))
print(addr)

and my expected output is \x4a\x2d\x40

Thanks in advance

A problem you will encounter is that str(addr.to_bytes(3,'little')) doesn't quite do what you think it does. You likely want addr.to_bytes(3,'little').decode(). — Kemp
– Kemp, Commented Dec 4, 2020 at 14:57
In terms of the actual question, this has been asked a number of times on Stack Overflow, for example at stackoverflow.com/questions/25348229/… and stackoverflow.com/questions/26568245/…. It may be worth looking through previous answers. — Kemp
– Kemp, Commented Dec 4, 2020 at 15:01
Thanks, but when I use addr.to_bytes(3,'little').decode() I get J\x1e — nad34
– nad34, Commented Dec 4, 2020 at 15:04
Does this answer your question? Forcing escaping of printable characters when printing bytes in Python 3 — Kemp
– Kemp, Commented Dec 4, 2020 at 15:07
There is no point doing int(..., 16) in your example. Python already understand that 0x402d4a is base-16, and performed the conversion to int implicitly. In fact, doing what you did there will raise a TypeError — pepoluan
– pepoluan, Commented Dec 4, 2020 at 15:10

pepoluan · Accepted Answer · 2020-12-04 15:06:52Z

1

There is no direct way to get \x4a\x2d and so forth from a string. Or bytes, for this matter.

What you should do:

Convert the int to bytes -- you've done this, good
Loop over the bytes, use f-string to print the hexadecimal value with the "\\x" prefix
join() them

2 & 3 can nicely be folded into one generator comprehension, e.g.:

rslt = "".join(
    f"\\x{b:02x}" for b in value_as_bytes
)

answered Dec 4, 2020 at 15:06

pepoluan

6,9615 gold badges55 silver badges86 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to get the raw bytes from a hex string in python

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related