docs: def encode(string):
  		"""
  		Encode the given string as an OID.
  
  		>>> import snmp_passpersist as snmp
  		>>> snmp.PassPersist.encode("hello")
  		'5.104.101.108.108.111'
  		>>>
  		"""
  
  		result=".".join([ str(ord(s)) for s in string ])
  		return  "%s." % (len(string)) + result