For many uses of /usr/bin/bugzilla and python-bugzilla, it's necessary to actually be logged in to a bugzilla server. Creating bugs, editing bugs, querying private data, etc.
Up until now anyone that's used the command line tool has periodically had to do a 'bugzilla login' to refresh their authentication cache. In older bugzilla versions this was an HTTP cookie, more recently it's a bugzilla API token. Generally 'login' calls were needed infrequently on a single machine as tokens would remain valid for a long time.
Recently, bugzilla.redhat.com received a big update to bugzilla 5.0. However with that update it seems like API tokens now expire after a week, which has necessitated lots more 'bugzilla login' calls than I'm used to.
Thankfully with bugzilla 5.0 and later there's a better option: API keys. Here's how to to use them transparently with /usr/bin/bugzilla and all python-bugzilla library usage. Here's steps for enabling API keys with bugzilla.redhat.com, but the same process should roughly apply to other bugzilla instances too.
Login to the bugzilla web UI, click your email, select Preferences, select API Keys. Generate an API key with an optional comment like 'python-bugzilla'. Afterwards the screen will look something like this:
MY-EXAMPLE-API-KEY is not my actual key, I just replaced it for demo purposes. The actual key is a long string of characters and numbers. Copy that string value and write a bugzillarc file like this:
$ cat ~/.config/python-bugzilla/bugzillarc [bugzilla.redhat.com] api_key=MY-EXAMPLE-API-KEY
That's it, /usr/bin/bugzilla and python-bugzilla using tools should pick it up automagically. Note, API keys are as good as passwords in certain ways, so treat it with the same secrecy you would treat a password.