Passing Parameters to copy_expert()?

However, I need to pass some parameters into the SQL statement - namely the values for a WHERE IN clause.

(Basically, the COPY operation is too big for our PostgreSQL server to handle, so we're chunking it up into multiple queries - hence, needing to pass in values to WHERE IN).

I can't seem to see anything in the docs about this about how to pass parameters through to copy.

I could use Python's own string interpolation, however, I'm under the impression that's a pretty bad thing.

Is there another way to pass parameters to copy_expert()?