In pandas 0.16.1, I get a ValueError when trying to mask an empty DataFrame:
>>> import pandas as pd
>>> df = pd.DataFrame()
>>> df[df>0]
Traceback (most recent call last):
File "<ipython-input-3-efe84c9ebabc>", line 1, in <module>
df[df>0]
File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1787, in __getitem__
return self._getitem_frame(key)
File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1859, in _getitem_frame
raise ValueError('Must pass DataFrame with boolean values only')
ValueError: Must pass DataFrame with boolean values only
Using 'where' works as expected:
>>> df.where(df>0) Out[4]: Empty DataFrame Columns: [] Index: []
Also, masking a Series works as expected:
>>> ts = pd.Series() >>> ts[ts>0] Out[6]: Series([], dtype: float64)
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