Ilustration:
idx = pd.Index(['a', 'b', 'c', 'd'])
idx - ['a', 'd']
idx - pd.Index(['a', 'd'])
gives:
In [1]: idx = pd.Index(['a', 'b', 'c', 'd'])
In [2]: idx - ['a', 'd']
Out[2]: Index([u'b', u'c'], dtype='object')
In [3]: idx - pd.Index(['a', 'd'])
c:\users\vdbosscj\scipy\pandas-joris\pandas\core\index.py:1192: FutureWarning: u
sing '-' to provide set differences with Indexes is deprecated, use .difference(
)
"use .difference()",FutureWarning)
Out[3]: Index([u'b', u'c'], dtype='object')
So a list is treated a an index-like (as it performs a set operation), but does not raise a warning as it should (the same for arrays, series).
We have an occurrence in the docs of this one.
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