8000 ERR: concat of 2 Series categories does not preserve category dtype · Issue #8641 · pandas-dev/pandas · GitHub
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ERR: concat of 2 Series categories does not preserve category dtype #8641
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#8714
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ERR: concat of 2 Series categories does not preserve category dtype#8641
#8714
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BugCategoricalCategorical Data TypeError ReportingIncorrect or improved errors from pandas
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0.15.2
@jreback

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@jreback
jreback
opened on Oct 26, 2014

xref #8640

As this is inconcistent with how DataFrame concat's work (its a different code-path), so needs updating

s = Series(list('abc'),dtype='category')
s2 = Series(list('abd'),dtype='category')

# this should raise
pd.concat([s,s2])

# this should be a category
pd.concat([s,s])

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