Python tuples are converted to sql lists in psycopg2:
cur.mogrify("SELECT * FROM table WHERE column IN %s;", ((1,2,3),))
would output
'SELECT * FROM table WHERE column IN (1,2,3);'
For Python newcomers: It is unfortunately important to use a tuple, not a list here. Here’s a second example:
cur.mogrify("SELECT * FROM table WHERE column IN %s;",
tuple([row[0] for row in rows]))