import quickfix

class MyStringField(quickfix.StringField):
	def __init__(self)
		quickfix.StringField.__init__(self, 6123)
	def __init__(self, data)
		quickfix.StringField.__init__(self, 6123, data)

class MyPriceField(quickfix.DoubleField):
	def __init__(self)
		quickfix.DoubleField.__init__(self, 8756)
	def __init__(self, data)
		quickfix.DoubleField.__init__(self, 8756, data)