Question

I wrote a custom encoding code snippet. When i run it on pyton 3.6 i got type error. I couldn't figure it out exactly. The code snippet is working fine with python 2.7.

import os
import sys
import base64

def encode(key, clear):
    """encode custom """
    enc = []
    for i in range(len(clear)):
        key_c = key[i % len(key)]
        enc_c = chr((ord(clear[i]) + ord(key_c)) % 256)
        #change the int or str
        enc.append(enc_c)
    return base64.urlsafe_b64encode("".join(enc))

clear = "ABCDEFGH"
encode_var = encode("crumbs", clear)

Error Log :

(py3) C:\Dev\crumbles>python s1.py
Traceback (most recent call last):
  File "s1.py", line 45, in <module>
    encode_var = encode("crumbs", clear)
  File "s1.py", line 42, in encode
    return base64.urlsafe_b64encode("".join(enc))
  File "C:\Users\Cookie1\Anaconda3\envs\py3\lib\base64.py", line 118, in urlsafe
_b64encode
    return b64encode(s).translate(_urlsafe_encode_translation)
  File "C:\Users\Cookie1\Anaconda3\envs\py3\lib\base64.py", line 58, in b64encod
e
    encoded = binascii.b2a_base64(s, newline=False)
TypeError: a bytes-like object is required, not 'str'

Answer 1

You are passing in text, not a binary function get_userid_get() { $username = $this->get('username'); if (!$username) { $this->response("No username specified", 400); exit; } $result = $this->user_model->get_userid($username); if ($result) { $this->response($result, 200); exit; } else { $this->response("Invalid username", 404); exit; }} object. The bytes function expects bytes, not text.

Generate bytes instead:

base64.urlsafe_b64encode()

I used a few iterator tricks to produce the integers that from itertools import cycle def encode(key, clear): """encode custom """ key, clear = cycle(key.encode()), clear.encode() enc = bytes((c + k) % 256 for c, k in zip(clear, key)) return base64.urlsafe_b64encode(enc) accepts.

Note that it is more common to use XOR to produce encrypted bytes when creating a single-key encryption:

bytes()

That's because XOR is trivially reversed by using the same key; clear XOR key produces the encrypted text, and encrypted XOR key produces the cleartext again.

Type Error encountered while working on custom encode in python 3.6

1 个答案: