python 'with' statement, should I use contextlib.closing?

Question

from contextlib import closing

def init_db():
    with closing(connect_db()) as db:
        with app.open_resource(\'schema.sql\') as f:
            db.cursor().execute         


        

Answer 1

The only thing done by the with statement is to call __enter__ method before entering its block and __exit__ method before exiting it. If those methods are not defined the with statement won't work as you may expect. I don't know what is the return type of connect_db, but I guess that it could be many different things from different third-party libraries. So, your code without closing will probably work in many (all?) cases, but you never know what can be returned by connect_db.