Trim high identity sites/columns from alignment?

[metasoarous]

From: https://twitter.com/firefoxx66/status/1244956562550120448?s=20

Is there a good python module/code that can (speedily) read in - or reduce to after reading in - only the variable sites from a sequence alignment?

Maybe something like a --trim-invariant and/or --trim-invariant-threshold options?