Python bytearray inside string problems

Question

I have a function to convert bytearrays into bytes:

def dehex(d):
        return bytes(bytearray(d))

test = dehex([0xe7,0xcd,0xb0,0xa2])

this works perfectly fine

However

I have a few saved bytearrays like the one above inside a txt file using pickle, that looks like this:

0xe7,0xcd,0xb0,0xa2

and i want to be able to load them from the txt file, the problem arises if i read the file it returns a string which doesn't work with my dehex function. it is like it gets interpreted as such:

dehex(["0xe7,0xcd,0xb0,0xa2"])

how would i make this work?

fountainhead · Accepted Answer · 2020-10-30 23:02:22Z

1

Perhaps this will help:

my_str = "0xe7,0xcd,0xb0,0xa2" # String read from file.

my_bytes_list = [bytes.fromhex(c[2:]) for c in my_str.split(",")]

result = [dehex(bytes.fromhex(c[2:])) for c in my_str.split(",")]

print (result)

Output:

[b'\xe7', b'\xcd', b'\xb0', b'\xa2']

answered Oct 30, 2020 at 23:02

fountainhead

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4 Comments

fountainhead Over a year ago

@EmilB Your function is called in the third line

Marcus F Over a year ago

this doesnt work, maybe i if i could turn it into a string somehow

fountainhead Over a year ago

Could you please elaborate? What needs to be turned into string? Also, could you please mention some exact expected output along with the corresponding input, passed to the function. Right now, in my answer, the string 'e7' is being passed to dehex to get the bytes value b'\xe', 'cd' is passed to get b'\xcd', 'b0' is passed to get b'\xb0', and finally, the string 'az' is passed to get the bytes value b'\xaz'. If this is not what is expected, please specify the exact output expected.

Marcus F Over a year ago

Nevermind i got it working, thank you for your advice

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