DatetimeIndex.astype(dtype, copy=True)

DataFrame.ewm(com=None, span=None, halflife=None, alpha=None, min_periods=0, freq=None, adjust=True, ignore_na=False, axis=0)

DatetimeIndex.to_series(keep_tz=False)

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)

DataFrame.plot(x=None, y=None, kind='line', ax=None, subplots=False, sharex=None, sharey=False, layout=None, figsize=None, use_index=True, title=None

Series.str.isalpha()

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