/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

Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]

0

Null_previous_rank = f500[f500['previous rank'].isnull()][['company','rank','previous rank']]

0
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