MultiIndex.equals(other)

Index.drop(labels, errors='raise')

Series.data return the data pointer of the underlying data

DataFrame.sub(other, axis='columns', level=None, fill_value=None)

Series.str.isalpha()

Since many potential pandas users have some familiarity with SQL

TimedeltaIndex.slice_indexer(start=None, end=None, step=None, kind=None)

TimedeltaIndex.sort_values(return_indexer=False, ascending=True)

DataFrame.take(indices, axis=0, convert=True, is_copy=True, **kwargs)

Series.isnull()