How can I get the former ISIN in case of an ISIN change with Python from LSEG.data ?

Torben2

With Excel I got the following way for an example RIC which works:

RDP.Data("WSE.O";"TR.ISIN";"Frq=D SDate=2024-01-01 EDate=1D CH=Fd RH=IN,date")

But when trying to transform the formula to a Python program I get an error "Error code 221 | The access to field(s) denied. Requested universes: ['JE00BQKY0816']. Requested fields: ['TR.ISIN']".

This sounds like an access problem, but I do get data with Excel!

This is my coding:

isin_list = ["JE00BQKY0816"]

retr_isin_list1 = ["TR.ISIN"]

param = {"frq": "D", "SDate": "2026-04-15", "EDate": "1D", }       

response = fundamental_and_reference.Definition(universe = isin_list,
                  fields = retr_isin_list1, 
                  parameters = param).get_data()       

result = response.data.df

ujjawal_khandelwal

Hi @Torben2,
Thank you for reaching out!

The history can be extracted using the code in the following format:

import lseg.data as ld

ld.open_session()


ld.get_history(

    universe=['JE00BQKY0816'],

    fields=['TR.ISIN'],  # pls use TR.RIC if you want to get the RIC

    start='1950-01-01', # randomly chose this - will fetch history from 1950 to end date

    end='2026-06-30',   

)
ld.close_session()

Please let me know if this helps.
Thank you : )