Closed
Description
Code Sample, a copy-pastable example if possible
import pandas as pd
pd.__version__
Out[1]: '0.22.0'
data = pd.Series([-9.0, 0.0])
data.isin([-9, -0.5])
Out[2]:
0 True
1 False
dtype: bool
data = pd.Series([-9, 0])
data.isin([-9, -0.5])
Out[3]:
0 True
1 True
dtype: bool
Problem description
.isin seems to implicitly convert the data type of what is passed in values depending on the data type of the Series. In the above example, I would expect the output to be (True, False) in both cases. There seems to have been a change in behavior after pandas version 0.19.2. With version 0.19.2 the output is in both cases (True, False).
Expected Output
import pandas as pd
pd.__version__
Out[1]: '0.19.2'
data = pd.Series([-9.0, 0.0])
data.isin([-9, -0.5])
Out[2]:
0 True
1 False
dtype: bool
data = pd.Series([-9, 0])
data.isin([-9, -0.5])
Out[3]:
0 True
1 False
dtype: bool