Convert SPARQLWrapper.SmartWrapper to pandas dataframe about sparqlwrapper HOT 6 OPEN

@appliedgraphs have you seen this existing script: https://github.com/RDFLib/sparqlwrapper/blob/master/SPARQLWrapper/sparql_dataframe.py

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I hadn't, but it's nice and easy to follow. It also works wonderfully! What can be done to make this easier to find or otherwise more integrated with rdflib?

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Yes, I think PANDAS is well known enough to be supported as a standard output option. The only hitch is that we want to ensure basic installation of SPARQLWrapper doesn't require PANDAS, since it's large, so it can be included but a pip install optional will need to be made to enable it.

Something like pandas[pandas] in requirements.txt and then pip install sparqlwrapper[pandas] to install.

Would love to see a PR for this...

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@nicholascar Already:

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Great, thanks @eggplants, so the installation tasks are already done. So, I suppose, a deeper integration of PANDAS could be made, as long as appropriate warnings are thrown if users try and call PANDAS exports without the necessary installation.

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this is what pyLodStorage was motivated by https://github.com/WolfgangFahl/pyLoDStorage where you get list of dicts that you can immediately use in pandas see #160

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