no encode method on password as it is bytes in py3

[Christian Ehrhardt ]

Hi,
I've seen various cases on my system of this error - on Xenial which my system is, but also on snaps that clearly work for others - so there must be a portion of my "system setup" involved that triggers this I don't see yet.

The issue appears as:
[...]
  File "/snap/git-ubuntu/114/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 384, in do_save
    'launchpadlib', unique_key, serialized)
  File "/snap/git-ubuntu/114/usr/lib/python3/dist-packages/keyring/core.py", line 48, in set_password
    _keyring_backend.set_password(service_name, username, password)
  File "/snap/git-ubuntu/114/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

And that essentially is:
/usr/lib/python3/dist-packages/launchpadlib/credentials.py
360 B64MARKER = b"<B64>"
...
382 serialized = self.B64MARKER + b64encode(serialized)
383 keyring.set_password(
384 'launchpadlib', unique_key, serialized)
...
/usr/lib/python3/dist-packages/keyring/backends/file.py
 87 password_encrypted = self.encrypt(password.encode('utf-8'))

Now in python3 b64encode returns bytes and B64MARKER clearly is defined as bytes.
So the object arriving at the encode call is "bytes".
But encode is a method of string not bytes which triggers the error.

I beg your pardon for not (yet) seeing why this hits me but not others.
I almost expect more to be updated on my py-foo than a bug-fix :-/