from pycen import con_gn    

sql = '''
    CREATE OR REPLACE VIEW gn_exports.v_bam_widget AS
    SELECT
    t.cd_ref AS cd_ref,
    t.nom_vern AS nom_vernaculaire,
    t.lb_nom AS nom_scientifique,
    s.id_synthese AS id_synthese,
    s.date_min AS date_min,
    s.date_max AS date_max,
    s.the_geom_4326 AS the_geom_4326,
    t.classe AS classe
    FROM gn_synthese.synthese s
    JOIN taxonomie.taxref t USING(cd_nom)
    ;
'''

with con_gn.begin() as cnx:
    cnx.execute(sql)