2to3 inscrutable output

[rurpy]

What is this output from 2to3 supposed to mean?
$ cat mysub.py
isinstance (3, (int,float))
$ 2to3 -f isinstance mysub.py
RefactoringTool: No changes to mysub.py
RefactoringTool: Files that need to be modified:
RefactoringTool: mysub.py
Why does mysub.py need to be modified, and how?

 

[Steven D'Aprano]

What is this output from 2to3 supposed to mean?
$ cat mysub.py
isinstance (3, (int,float))
$ 2to3 -f isinstance mysub.py
RefactoringTool: No changes to mysub.py
RefactoringTool: Files that need to be modified:
RefactoringTool: mysub.py

Why does mysub.py need to be modified, and how?

Bleh. Who came up with this user interface?

I call confusing output like this a UI bug. But after playing around with
various small files, it *seems* to me that the "Files that need to be
modified" actually means "Files that include something that a fixer cares
about, whether or not it gets modified" (in this case, isinstance).