gh-138897: Use _pyrepl.pager for _sitebuiltins._Printer

[StanFromIreland]

• Issue: license() prompt is not cleared in new repl #138897

[ambv]

Great idea, love it. In fact, you can use the pager always since it's deliberately a rather independent part of PyREPL. pydoc is using it, too (the code was moved from there originally)

[picnixz]

In fact, you can use the pager always since it's deliberately a rather independent part of PyREPL

Would it be possible to isolate it outside _pyrepl? (would it also make sense?) Since we have _colorize for colorization support, _pypager.py would make sense (I would suggest the _py prefix to be sure we don't shadow _pager.py modules from users)

[ambv]

Would it be possible to isolate it outside _pyrepl?

Yes, I moved it out of pydoc mostly to be able to type-annotate it, change the API a bit, and make it fully independent of pydoc. I didn't want to make up a top-level module name at the time, but if it makes sense, we can do that.

[StanFromIreland]

Thanks!