title: python: Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4
body: <p>output the following error:</p>
  
  <blockquote>
    <p>Exception Value:<br>
    Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4<br>
    Exception Location: D:\Program Files\Python\lib\base64.py in b64decode, line 87
    "</p>
  </blockquote>
  
  <p>I input python like this :</p>
  
  <pre><code>key = hashlib.md5("exit_care".encode("ascii")).hexdigest().encode("ascii")
  key_64 = base64.urlsafe_b64decode(key)
  cipher_suite = Fernet(key_64)  
  </code></pre>