Useful examples would be
1) searching for RIC's listed on Nasdaq/NYSE containing .O, .N, .K, .OQ etc.
2) finding news tagged to atleast one company if RIC column is not empty
Is it possible to specify this in the Python API for EIKON?
Please refer to Reference for Ekon Data API get_news for the complete set of parameters available.
I don't believe this is available via Eikon Data API. Machine Readable News (MRN) may be a possible approach. Via realtime Elektron feed, Machine Readable News (MRN), stories are tagged via Topic codes, something like:
is what you would expect to see.