pandas.DataFrame.unstack — pandas 0.16.2 documentation (original) (raw)
DataFrame.unstack(level=-1)¶
Pivot a level of the (necessarily hierarchical) index labels, returning a DataFrame having a new level of column labels whose inner-most level consists of the pivoted index labels. If the index is not a MultiIndex, the output will be a Series (the analogue of stack when the columns are not a MultiIndex). The level involved will automatically get sorted.
| Parameters: | level : int, string, or list of these, default -1 (last level) Level(s) of index to unstack, can pass level name |
|---|---|
| Returns: | unstacked : DataFrame or Series |
Examples
index = pd.MultiIndex.from_tuples([('one', 'a'), ('one', 'b'), ... ('two', 'a'), ('two', 'b')]) s = pd.Series(np.arange(1.0, 5.0), index=index) s one a 1 b 2 two a 3 b 4 dtype: float64
s.unstack(level=-1) a b one 1 2 two 3 4
s.unstack(level=0) one two a 1 3 b 2 4
df = s.unstack(level=0) df.unstack() one a 1. b 3. two a 2. b 4.