import string
 
 
 class Test(string.Formatter):
 	def get_field(self, field_name, args, kwargs):
 		#result = string.Formatter.get_field(self, field_name, args, kwargs)
 		result = ('a','a')
 		print 'get_field(',self, field_name, args, kwargs,'):', result
 		return result
 	def get_value(self, key, args, kwargs):
 		print 'get_value(',self, key, args, kwargs,')'
 		return "asd"