DataFrame.combine_first(other)

DataFrame.nsmallest(n, columns, keep='first')

DataFrame.consolidate(inplace=False)

DataFrame.sortlevel(level=0, axis=0, ascending=True, inplace=False, sort_remaining=True)

DataFrame.iteritems()

DataFrame.clip_upper(threshold, axis=None)

DataFrame.slice_shift(periods=1, axis=0)

DataFrame.corr(method='pearson', min_periods=1)

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

DataFrame.sort(columns=None, axis=0, ascending=True, inplace=False, kind='quicksort', na_position='last', **kwargs)