Hi @amalhamdana.alhamdan ,

The code below can be used, example code can be found here

import refinitiv.data as rd
from refinitiv.data.discovery import Chain

rd.open_session()
asx200 = Chain("0#.AXJO")

print(asx200.constituents))

Then from the list of Constituents, retrieve the data with get_data function, for example

rd.get_data(asx200, ['TR.CommonName', 'BID', 'ASK', 'TR.Revenue'])

This article can be useful for you in using the Data Library The Data Library for Python - Quick Reference Guide (Access layer)

I hope this helps and please let me know in case you have any question.