Series.nunique(dropna=True)

Index.memory_usage(deep=False)

Index.inferred_type = None

Series.str.extract(pat, flags=0, expand=None)

DataFrameGroupBy.count()

DatetimeIndex.where(cond, other=None)

MultiIndex.append(other)

DatetimeIndex.is_lexsorted_for_tuple(tup)

DatetimeIndex.duplicated(*args, **kwargs)

Panel.reindex(items=None, major_axis=None, minor_axis=None, **kwargs)