pandas.DataFrame.align

DataFrame.align(other, join='outer', axis=None, level=None, copy=True, fill_value=nan, method=None, limit=None, fill_axis=0)

Align two DataFrame object on their index and columns with the specified join method for each axis Index

other : DataFrame or Series join : {‘outer’, ‘inner’, ‘left’, ‘right’}, default ‘outer’ axis : {0, 1, None}, default None

Align on index (0), columns (1), or both (None)
level : int or name
Broadcast across a level, matching Index values on the passed MultiIndex level
copy : boolean, default True
Always returns new objects. If copy=False and no reindexing is required then original objects are returned.
fill_value : scalar, default np.NaN
Value to use for missing values. Defaults to NaN, but can be any “compatible” value

method : str, default None limit : int, default None fill_axis : {0, 1}, default 0

Filling axis, method and limit
(left, right) : (DataFrame, type of other)
Aligned objects