HDFStore.get(key)

MultiIndex.size return the number of elements in the underlying data

MultiIndex.summary(name=None)

Index.map(mapper)

Series.cat()

DataFrame.shift(periods=1, freq=None, axis=0)

DataFrame.transpose(*args, **kwargs)

Series.consolidate(inplace=False)

MultiIndex.is_monotonic_increasing return if the index is monotonic increasing (only equal or increasing)

Series.dt.days Number of days for each element.