import fdb

con = fdb.connect(dsn='molgenvz.cde.ua.ac.be:/home/firebird/gentli.fdb',
                  user='wdc',
                  password="mypassword",
                  role='NBD_SC')
cur = con.cursor()
cur.execute('select "id", "sample_individual", "sample_sample", "experiment_id", \
            "experiment_description", "wes_project" from "NBD_SC:full_wes" \
            where \
            "wes_exome_capture_kit" = ? and \
            "ngs_seq_pct_target20x" > ?', (kit, min_cov_frac))
 res = [cur.fetchall()]