SNMP query with Python

#!/usr/bin/env python     
import Netsnmp    
        
class SNMP (object): ""    
    A Basic SNMP Session ""
    def __init__ (self ,    
                 oid = "SYSDESCR",    
                 Version = 2,    
                 desthost = "localhost",    
                 Community = "public"):    
        self.oid = oid    
        Self.version   = version    
        self.desthost  = desthost    
        self.community = Community    
        
    def query (self) : ""    
        creates SNMP query session ""
        try: Result    
            = Netsnmp.snmpwalk (self.oid,    
                                  Version   = Self.version,    
                                  desthost  = self.desthost,    
                                  Community = self.community)    
        except Exception,err:    
            Print Err result    
            = None
        finally:    
            print  result    
snmp=snmp ()    
snmp.query ()