/Python/Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
0
Source: community.dataquest.io
Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
0
Source: community.dataquest.io
Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]
0
Source: community.dataquest.io
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