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How to access news data feed to do sentiment analysis?


How to access news data feed and how to change the parameter of news data feed function?
And does it output a dataframe or a dictionary?
According to the Web API Tech Doc, there are 2 ways to get news data. 
You can refer to the Navie News Trade example as well. 

1. News Stream ( - the output is an object
2. getHistoricalNews ( - the output is json