db.py 文件源码

def __init__(self, **keywords):
        if 'pw' in keywords:
            keywords['password'] = keywords.pop('pw')

        db_module = import_driver(["psycopg2", "psycopg", "pgdb"], preferred=keywords.pop('driver', None))
        if db_module.__name__ == "psycopg2":
            import psycopg2.extensions
            psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)

        # if db is not provided postgres driver will take it from PGDATABASE environment variable
        if 'db' in keywords:
            keywords['database'] = keywords.pop('db')

        self.dbname = "postgres"
        self.paramstyle = db_module.paramstyle
        DB.__init__(self, db_module, keywords)
        self.supports_multiple_insert = True
        self._sequences = None