concat() drops index when used on series with a PeriodIndex · Issue #1815 · pandas-dev/pandas (original) (raw)

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Description

New to this, sorry if I'm just missing something...

import numpy as np import pandas as pd

d1 = pd.date_range('12/31/1990', '12/31/1999', freq='A-DEC') d2 = pd.date_range('12/31/2000', '12/31/2009', freq='A-DEC')

s1 = pd.Series(np.random.randn(10), d1) s2 = pd.Series(np.random.randn(10), d2)

works

pd.concat([s1,s2])

s1 = s1.to_period() s2 = s2.to_period()

drops index

pd.concat([s1,s2])

workaround

pd.concat([s1.to_timestamp(), s2.to_timestamp()]).to_period('A-DEC')