Public bug reported:

Hi,

I have a program written in python 3 which uses launchpadlib, and it's
crashing if it tries to use the 'file' backend:

$ kubuntu-retry-builds -r frameworks -d artful
Logs are activated and are going to be stored in:
/home/santa/kubuntu-retry-builds_logs
If you want to disable this feature, edit your ~/kubuntu-automation.conf
Date started: Sat, 22 Apr 2017 22:52:10 +0200
The authorization page:
 
(https://launchpad.net/+authorize-token?oauth_token=qp1rQXkMXWMMj0pQBHgq&allow_permission=DESKTOP_INTEGRATION)
should be opening in your browser. Use your browser to authorize
this program to access Launchpad on your behalf.
Waiting to hear from Launchpad about your decision...
Traceback (most recent call last):
  File "/usr/bin/kubuntu-retry-builds", line 90, in <module>
    lp = Launchpad.login_with("kubuntu-retry-builds", "production")
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 549, in 
login_with
    credential_save_failed, version)
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 356, in 
_authorize_token_and_login
    credentials = authorization_engine(credentials, credential_store)
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 553, 
in __call__
    credential_store.save(credentials, self.unique_consumer_id)
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 308, 
in save
    raise e
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 303, 
in save
    self.do_save(credentials, unique_consumer_id)
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 385, 
in do_save
    'launchpadlib', unique_key, serialized)
  File "/usr/lib/python3/dist-packages/keyring/core.py", line 48, in 
set_password
    _keyring_backend.set_password(service_name, username, password)
  File "/usr/lib/python3/dist-packages/keyring/backends/file.py", line 87, in 
set_password
    password_encrypted = self.encrypt(password.encode('utf-8'))                 
                                                                              
AttributeError: 'bytes' object has no attribute 'encode' 

As a workaround I replaced the file.py line in question with:
password_encrypted = self.encrypt(str(password).encode('utf-8'))
and now it works.

** Affects: python-keyring (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1685547

Title:
  Crash in python3 with the 'file' backend

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