解码功能中python2和python3之间的区别

Question

Recently, I watched a video about writing a code to decode the title and contents of the file from decimal numbers into strings. However, it is written in python2 so I decided to rewrite the code in python3. Unfortunately, I am having trouble in decoding the contents of the picture.

This is the original code in python2:

#!/usr/bin/env python

import os

directory = '1262404985085867488371'

def decrypt(number): 
    return hex(int(number))[2:].replace("L","").decode("hex")


os.chdir(directory)
for i in os.listdir('.'):
    try:
        print(decrypt(i))
        c = open(i).read()
        open(decrypt(i),'w').write(decrypt(c))
        #o.write(decrypt(c))

    except:
        print("FAILED WITH",i)

And this is the code written in python3:

#!/usr/bin/env python3

import os

directory = '1262404985085867488371'

def decrypt(number): 
    hex_num = hex(int(number))[2:].replace("L","")
    return  bytes.fromhex(hex_num).decode("ascii")


os.chdir(directory)
for i in os.listdir('.'):
    try:
        print(decrypt(i))
        c = open(i).read()
        open(decrypt(i),'w').write(decrypt(c))
        #o.write(decrypt(c))

    except:
        print("FAILED WITH",i)

Can anyone help me to have a look how can I solve this problem? This is the problem about:

My computer got infected with ransomware and now none of my documents are accessible anymore! If you help me out, I'll reward you a flag! https://static.tjctf.org/7459b0c272ba30c9fea94391c7d7051d78e1732c871c3a6f27070fcb34f9e734_encrypted.tar.gz

Basically, I have tried by changing the ascii into utf-8 and open the file with the mode in "wb" or "rb" but neither of them works...

Answer 1

I'm going to jump the gun here and since you did not include any examples and\\or errors I will guess you got this kind of error:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd7 in position 0: ordinal not in range(128)

This is caused by a file\\directory with a unicode name, which in turn triggers this exception when you try to decode with ascii as in decode("ascii") .

Instead, try decoding with "utf-8".