How to unnest (explode) a column in a pandas DataFrame, into multiple rows

pythonpandasdataframepandas-explode
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Dynamically select data frame columns using $ and a character value

rr-faqdataframe
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How do I Pandas group-by to get sum?

pythonpandasgroup-bydataframeaggregate
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Sort (order) data frame rows by multiple columns

rr-faqdataframesorting
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The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe

rr-faqlistdataframeextract
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