Hi,
I am using the pydatastream package to query some data. I have a list of datastream mnemonics for stocks, such as @AAPL. How can I get the mnemonic of the chain of options that trades on AAPL? In this specific case I can find it through the DFO navigator, where for example the chain for live AAPL calls is LOPTAAQ$LC, but I am looking for a way to do this programmatically for many stocks.