Get random rows from postgres more than number of rows

I'm using SQLALchemy and Postgresql.

Imagine I have a SQLAlchemy class Items,

There are 100 items in this table, I want to get for example 200 random rows(expected rows are not unique indeed).

for getting less than 100 easily I do:

items = session.query(Items)\
    .order_by(func.random())\
    .limit(80)\
    .all()

But how can I get more than 100 rows if only I have 100?