API Related Query

Denis Gribenyuk · 2025-03-17T14:54:13+00:00

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Denis Gribenyuk

Hi Team, please can you answer the below questions from my client.

I have a couple of questions on the recommended Python package and required credentials please.

There are three Python packages available:

https://pypi.org/project/refinitiv-data/

https://pypi.org/project/refinitiv-dataplatform/

https://pypi.org/project/lseg-data/

Which one do you recommend to use?

And then given the recommended package, could you share some example code that initiates a session without need for a config file please?

For example, using the definitiv.dataplatform I have tried:

import refinitiv.dataplatform as rdp

grant = rdp.GrantPassword(username="cip@vitol.com", password=xyz)

rdp.open_platform_session(

app_key="as generated on the workspace app",

grant=grant,

)

But this give me a PlatformSessionError:

PlatformSessionError: Error code -1 | ERROR!!! response 400 while requesting URL('https://api.refinitiv.com/auth/oauth2/v1/token').

{"error":"access_denied" ,"error_description":"Invalid username or password." }

I have also tried refinitiv.data but this seems more involved:

import refinitiv.data as rd

grant = rd.session.platform.GrantPassword(username="cip@vitol.com", password=…)

definition = rd.session.platform.Definition(

app_key="another api key",

grant=grant,

signon_control=False)

session = definition.get_session()

rd.open_session()

df = rd.get_data(

universe=['USD=', 'EUR=', "LSEG.L"],

fields=['BID', 'ASK', 'TR.Revenue']

)

Thank you for looking into this.

Kind regards,

Denis

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Accepted answers

Gurpreet

Hello @Denis Gribenyuk

lseg-data has superseded other legacy packages and is the right library to use. You can see the examples for it in the GitHub samples.

The notebook example on sessions show how to create and open a session without using configuration file.

session = ld.session.platform.Definition(
    app_key = APP_KEY, 
    grant = ld.session.platform.GrantPassword(
        username = RDP_LOGIN, 
        password = RDP_PASSWORD
    )
).get_session()

All comments

Gurpreet

Hello @Denis Gribenyuk

lseg-data has superseded other legacy packages and is the right library to use. You can see the examples for it in the GitHub samples.

The notebook example on sessions show how to create and open a session without using configuration file.

session = ld.session.platform.Definition(
    app_key = APP_KEY, 
    grant = ld.session.platform.GrantPassword(
        username = RDP_LOGIN, 
        password = RDP_PASSWORD
    )
).get_session()

Denis Gribenyuk

Thank you Gurpreet. I have shared with client. If any further questions I will post here.

raksina.samasiri

Hi @Denis Gribenyuk ,

For more detail, here's related article https://developers.lseg.com/en/article-catalog/article/essential-guide-to-the-data-libraries

Denis Gribenyuk

Hi Gurpreet,

Please see response from user.

This is helpful. Unfortunately my credentials don’t give me an open session – see my code and returned error below.

import lseg.data as ld

APP_KEY = "as generated for EDP"

RDP_LOGIN ="…”

RDP_PASSWORD ="…"

session = ld.session.platform.Definition(

app_key= APP_KEY,

grant= ld.session.platform.GrantPassword(

username= RDP_LOGIN,

password= RDP_PASSWORD

)

).get_session()

session.open()

[Error 400] - {'error': 'access_denied', 'error_description': 'Invalid username or password.'}

<OpenState.Closed: 'Closed'>

Let’s clarify please which credentials are needed here.

I have generated the two API keys as shown in the attached screenshot – could you check please that these are suitable?
What are my RDP login and password please? I have …
- a user name and password for the LSEG workstation (I can use this e.g. to log on to the web version of the workstation)
- user name (all numerical) and password for the DataScope service: https://select.datascope.refinitiv.com/DataScope/

Please can you help answer these questions.

Thanks,

Denis

Jirapongse

It uses the Data Platform credential. You can try with the following URL.

https://apidocs.refinitiv.com/Apps/ApiDocs

If you have the LSEG Workspace account, you can use the desktop session.

session = ld.session.desktop.Definition(app_key = APP_KEY).get_session()
session.open()

However, you need to run the application on the same machine as LSEG workspace and the LSEG workpace must be running.

Denis Gribenyuk

Please see reply from client - still unresolved.

My data platform credentials allow me to see the api docs and try out an end point:

However, when I use the same credentials with an app_key…

I get

If I change the APP_KEY variable to some made-up value, the error changes and becomes

Which suggests the APP_KEY variable in the first example is valid and the problem really is with username or password. Do these credentials need to be permissioned separately?

Denis Gribenyuk

Yes, plenty of those.

I wondered about that too but the web gui did not complain about me creating it all, so all seemed good…

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