human
Solve the following python programming problem given the following code:
def on_connect(self) : 
    if (connect.isolation_level is not None) : 
        def connect(conn) : 
            self.set_isolation_level (conn, self.isolation_level) 
return connect 
else : 
        return None 

    
    

    Fix the buggy line: if (connect.isolation_level is not None) :
assistant
#Here is Python program to fix the buggy line: if (connect.

if (self.isolation_level is not None) :