def quandl_identifier(self):
"""
Returns the Quandl identifier for a given contract
:return: str
"""
quandl_year = self.contract_month[:4]
quandl_month = contract_month_from_number(int(self.contract_month[4:]))
quandl_date_id = quandl_month + quandl_year
market = self.get_quandlmarket_for_instrument()
codename = self.get_quandlcode_for_instrument()
quandldef = '%s/%s%s' % (market, codename, quandl_date_id)
return quandldef
def letter_month(self):
return contract_month_from_number(self.month())
