add doc

Author: tigersk

tigeropen/quote/quote_client.py

@@ -851,7 +851,7 @@ def get_future_contract(self, contract_code, lang=None):
         get future contract by contract_code
         :param contract_code: code of future contract, like VIX2206, CL2203
         :param lang:
-        :return:
+        :return: pandas.DataFrame
         """
         params = FutureContractParams()
         params.contract_code = contract_code

tigeropen/trade/trade_client.py

@@ -154,7 +154,7 @@ def get_derivative_contracts(self, symbol, sec_type, expiry, lang=None):
         :param sec_type: type of contract. tigeropen.common.consts.SecurityType. support: OPTION, WAR, IOPT
         :param expiry: expiry date string, like '20220929'
         :param lang:
-        :return:
+        :return: list of Contract
         """
         params = ContractParams()
         params.symbols = symbol if isinstance(symbol, list) else [symbol]