Convert hex to bytes

Question

I have results of script in text and bytes stored in CSV text file, which looks like:

found_value_1;b'UT\x05\x00\x03'

found_value_2;b'UT\x05\x00\x04'

There is some text and, separated by semicolon, dump of bytes. I was seriously looking, but could not find instructions or examples on how could I read this file's corresponding part as bytes. Manually I can copy b'UT\x05\x00\x03' and paste it to a variable like this:

found_value_1 = b'UT\x05\x00\x03'

and it is ready to go as type 'bytes'. It was simple to read this file and have 'u' type variables created with values like "b'UT\x05\x00\x03'" (probably having double-slashes), but as I tried converting it back to bytes nothing of available examples worked for me. Help is appreciated.

I tried this: `variable = "b'UT\x05\x00\x03'" ` `variable_raw = "%r"%variable ` `result = ast.literal_eval(variable_raw)` `type(result)` str — Raul, Mar 30 '18 at 12:44
make it `variable = r"b'UT\x05\x00\x03'"` if you test on a literal — Jean-François Fabre, Mar 30 '18 at 12:50
Imagine the file has more than 2 lines. If I could add `'r'` by hand to all values being read from file I would instead do `variable = b'UT\x05\x00\x03'`. This variable is already `bytes` — Raul, Mar 30 '18 at 13:04

score 1 · Answer 1 · answered Mar 30 '18 at 13:09

1

let's say you have your csv file. Read it and evaluate the bytes using ast.literal_eval:

import csv,ast.literal_eval
with open("input.csv") as f:
   cr = csv.reader(f,delimiter=";")
   for row in cr:
      print(ast.literal_eval(row[1]))

answered Mar 30 '18 at 13:09

Jean-François Fabre

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Convert hex to bytes

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