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df.reindex(columns=['http_status', 'user_agent'])
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new_index = ['Safari', 'Iceweasel', 'Comodo Dragon', 'IE10',
'Chrome']
df.reindex(new_index)
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date_index2 = pd.date_range('12/29/2009', periods=10, freq='D') # reindex date
df2.reindex(date_index2)