sqlalchemy on conflict do something

sqlalchemy_pg_on_update.py

from sqlalchemy.ext.compiler import compiles
from sqlalchemy.sql.expression import Insert

# @compiles(Insert)
# def prefix_inserts(insert, compiler, **kw):
#     sql = compiler.visit_insert(insert, **kw)
#     if "RETURNING" not in sql:
#         return sql + ' ON CONFLICT DO NOTHING'
#     else:
#         return sql
    # sql = re.sub(r'(RETURNING .*$)', 'ON CONFLICT DO NOTHING \\1', sql, 0, re.I)
    # return sql