Issues with rd.open_session (python API)

ernesto.quiros

hey guys, I'm trying to run the following lines:

import refinitiv.data as rd

rd.open_session()

trading_instrument = 'ESc1'
prices = rd.get_history(
universe = trading_instrument,
fields=['TRDPRC_1'],
start = "1997-01-01",
end = "2024-07-31",
)
prices = prices.loc[:,~prices.columns.duplicated()]
prices

and now I'm getting the following errors:

---------------------------------------------------------------------------

RDError Traceback (most recent call last)

Cell In[41], line 2

1 trading_instrument = 'ESc1'

----> 2 prices = rd.get_history(

3 universe = trading_instrument,

4 fields=['TRDPRC_1'],

5 start = "1997-01-01",

6 end = "2024-07-31",

7 )

8 prices = prices.loc[:,~prices.columns.duplicated()]

File ~\AppData\Local\anaconda3\Lib\site-packages\refinitiv\data\_access_layer\get_history_func.py:206, in get_history(universe, fields, interval, start, end, adjustments, count, use_field_names_in_headers, parameters)

204 if exceptions and all(exceptions):

205 except_msg = "\n\n".join(exceptions)

--> 206 raise RDError(-1, except_msg)

208 if not any({adc_data, hp_data, cust_inst_data}):

209 return DataFrame()

RDError: Error code -1 | No data to return, please check errors: ERROR: No successful response. (403, {"ErrorCode":1401,"ErrorMessage":"Application id RD-PYTHON-LIB is invalid"})

Last night it did execute it and pulled out data normally, but this time I got that error. Does anyone know how to sort this out?? I'd much appreciate any help.

Thanks,

Ernesto

jonathan.legrand

Hi @ernesto.quiros,

When starting with the RD Lib. For Python, I'd suggest reading the articles "LSEG’s Refinitiv Data Library for Python and its Configuration Process" and "Summary of Common LSEG Refinitiv APIs".

As per the former of the two articles, you can use `rd.open_session()` if you have the Workspace or Eikon Desktop Application running on the machine where you run your code to create a session authentifying yourself to LSEG’s services. The RD Lib. is created to search for configuration files that includes information such as your App Key, which are basically your username and password put together. (The App Key does not actually include your username and password, but it works as such, in effect, without any privacy issues.)

For more information, I'd read the two aforementioned articles.

In your case I suspect one of two things:

(i) the Workspace or Eikon Desktop Application running on the machine might be crashing, which would break the authentifying process. Have you noticed anything wrong with the Desktop App while running your code?

(ii) the LSEG service might be overloaded, in which case I would suggest coding defensively, using try loops and `time.sleep` in between each API call.