null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
f500.loc[f500["previous_rank"].isnull()]null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
f500.loc[f500["previous_rank"].isnull()]null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
f500["previous_rank"].isnull()null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
f500.loc[f500["previous_rank"].isnull()][["company","rank","previous_rank"]]Copyright © 2021 Codeinu
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