DataFrameGroupBy.cov(min_periods=None) Compute pairwise covariance of columns, excluding NA/null values

pandas.date_range(start=None, end=None, periods=None, freq='D', tz=None, normalize=False, name=None, closed=None, **kwargs)

Panel4D.last(offset)

DataFrame.product(axis=None, skipna=None, level=None, numeric_only=None, **kwargs)

DataFrame.__iter__()

Series.last_valid_index()

MultiIndex.rename(names, level=None, inplace=False)

DataFrame.ffill(axis=None, inplace=False, limit=None, downcast=None)

CategoricalIndex.str()

Series.at_time(time, asof=False)