I came across this today when being a little bit careless when using a boolean array to index into a Series. The result was not what I expected which turned out to be because I was using a boolean index in a DataFrame to index a Series. Either we should make this work or throw an error that you cannot index a Series with a DataFrame.
import pandas as pd
series = pd.Series(10, index=range(10))
df = pd.DataFrame(range(10), index=range(10))
series[df > 5]
Out[9]:
0 10
dtype: int64
# What is really meant is this:
series[df[0] > 5]
Out[11]:
6 10
7 10
8 10
9 10
dtype: int64
This is on 0.14.1
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