DataFrame.count(axis=0, level=None, numeric_only=False)

TimedeltaIndex.nbytes return the number of bytes in the underlying data

CategoricalIndex.ordered

DatetimeIndex.drop_duplicates(*args, **kwargs)

Panel.axes Return index label(s) of the internal NDFrame

DataFrameGroupBy.fillna(value=None, method=None, axis=None, inplace=False, limit=None, downcast=None, **kwargs)

CategoricalIndex.base return the base object if the memory of the underlying data is shared

CategoricalIndex.is_object()

CategoricalIndex.append(other)

StataReader.variable_labels()