Repair to “Using OAuth for a simple command line script to access Google's data”

In 2015, I wrote a command line script to get some data from YouTube.
Since I had difficulty puzzling out the limited documentation,
particularly on the authentication and authorization aspects, I wrote a
short article to capture what I'd learned. Google updated its libraries in
2016, breaking my scripts. I was busy with other things at the time, so
didn't update them (or the article). Finally I've got around to it now,
and updated both. Going back, I found the article handy to remind myself how to
work with Google's use of OAuth, with refresh and access tokens.

more…