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florian.ruemmelein avatar image
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Time Series Expression for List

Hi

I am using Datastream Web Service in Python and try to retrieve a time series of daily price changes (expression) for a single instrument or multiple instruments over a certain time horizon.

df=ds.get_data(tickers='S:NESN', fields='PCH#(X,1D)', start='-2Y', end='-0D', freq='W')

If I run this request, I receive the following error message:

Error - please check instruments and parameters (time series or static)

What am I doing wrong?

Thanks for your help.

datastream-apidsws-api
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pimchaya.wongrukun01 avatar image   pimchaya.wongrukun01

Hello @FRZH

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Thanks,

AHS

1 Answer

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Monika.Stankovic avatar image
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@FRZH

Please try adding the expression in the [ ] brackets.

ds.get_data(tickers='S:NESN', fields=['PCH#(X,-1M)'], start='-2Y', end='-0D', freq='W')

You can review examples of the requests here .

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