With in Python

See Example

Requirements: Database link operation without database connection pool "" "Class SQLHelper (object):    def Open:        pass    def fetch (self):        Pass    def close (self):        pass    def __enter__ (self):        self.open ()        return    to self def __exit__ (self, exc _type, Exc_val, EXC_TB):        self.close () # way One # obj = SQLHelper () # Obj.open () # Obj.fetch () # obj.close () # Way two with Sqlhelp ER () as obj:  # Automatically calls the __enter__ method in the class, and obj is the return value of the __enter__ method.    Obj.fetch ()    # The __exit__ method of the class is automatically called when execution is complete

　　

　　

With in Python