I just noticed that devel/py-astroid is being re-installed every time I run 
Update: Nevermind, the Similar Threads section, which appeared at the bottom of the forum page after I posted the above paragraph, led me to a post that showed how to solve this. I went to /var/db/pkg and did
So I ran
				
			 portmaster -aD. I just tested it a few moments ago by running it twice (this time without updating the ports tree in between) and it re-installed both times. Is this redundant or unnecessarily repetitive? Apparently the port was moved recently from devel/py-astng if that's a clue.Update: Nevermind, the Similar Threads section, which appeared at the bottom of the forum page after I posted the above paragraph, led me to a post that showed how to solve this. I went to /var/db/pkg and did
 ls | grep astng. This revealed the name was previously py27-astng-0.24.3.So I ran
 pkg delete py27-astng-0.24.3 after which  portmaster reported that all ports are up to date.