Writing hex data into a file
I'm trying to write hex data taken from ascii file to a newly created binary file ascii file example: 98 af b7 93 bb 03 bf 8e ae 16 bf 2e 52 43 8b df 4f 4e 5a e4 26 3f ca f7 b1 ab 93 4f 20 bf 0a bf 82 2c dd c5 38 70 17 a0 00 fd 3b fe 3d 53 fc 3b 28 c1 ff 9e a9 28 29 c1 94 d4 54 d4 d4 ff 7b 40 my code hexList =  with open('hexFile.txt', 'r') as hexData: line=hexData.readline() while line != '': line = line.rstrip() lineHex = line.split(' ') for i in lineHex: hexList.append(int(i, 16)) line = hexData.readline() with open('test', 'wb') as f: for i in hexList: f.write(hex(i)) Thought hexList holds already hex converted data and f.write(hex(i)) should write these hex data into a file, but python writes it with ascii mode final output: 0x9f0x2c0x380x590xcd0x110x7c0x590xc90x30xea0x37 which is wrong! where is the issue?
>>> import binascii >>> binascii.unhexlify('9f') '\x9f' >>> hex(int('9f', 16)) '0x9f'
import binascii with open('hexFile.txt') as f, open('test', 'wb') as fout: for line in f: fout.write( binascii.unhexlify(''.join(line.split())) )
f.write(chr(i)) # python 2
f.write(bytes((i,))) # python 3
>>> hex(65) '0x41'
65 should translate into a single byte but
hex returns a four character string.
write will send all four characters to the file.
By contrast, in python2:
>>> chr(65) 'A'
This does what you want:
chr converts the number
65 to the character single-byte string which is what belongs in a binary file.
chr(i) is replaced by
- Database Administration Tutorials
- Programming Tutorials & IT News
- Linux & DevOps World
- Entertainment & General News
- Games & eSport