Inserting multiple values doesn't work in some cases

[Former user]

inserting multiple rows using single list of row values doesn't work, ex.

conn.execute("insert into users (user_id, user_name) values (?, ?)", [(10,"donkey")]((9,"barney"),))

or

 conn.execute("insert into users (user_id, user_name) values (%s, %s)", [[4,"ed"]([4,"ed"), [5,"horse"](5,"horse")])

Attached patch fixes this.