"Empty dataset" message for every single formula that I try to get data from Materials Project

Question

I need to retrieve data from an element/compound in Material Project's datframe and so far every single formula that I've tried has an empty data set. I don't believe that it's true so I'm assuming there's something that I'm missing in my line of code and I have to know what the issue is. Can somebody please help me?

Df = MPdataretrieval (api_key = "my api key").get_dataframe(criteria = {'formula':}, properties = ['band_gap'])

Answer 1

Nedy Have you tried to actually provide some value to 'formula' key of the criteria dictionary?