pandas.MultiIndex.from_frame#

classmethod MultiIndex.from_frame(df, sortorder=None, names=None)[source]#

Make a MultiIndex from a DataFrame.

Parameters:

dfDataFrame: DataFrame to be converted to MultiIndex.
sortorderint, optional: Level of sortedness (must be lexicographically sorted by that level).
nameslist-like, optional: If no names are provided, use the column names, or tuple of column names if the columns is a MultiIndex. If a sequence, overwrite names with the given sequence.

Returns:

MultiIndex: The MultiIndex representation of the given DataFrame.

See also

MultiIndex.from_arrays: Convert list of arrays to MultiIndex.
MultiIndex.from_tuples: Convert list of tuples to MultiIndex.
MultiIndex.from_product: Make a MultiIndex from cartesian product of iterables.

Examples

>>> df = pd.DataFrame(
...     [["HI", "Temp"], ["HI", "Precip"], ["NJ", "Temp"], ["NJ", "Precip"]],
...     columns=["a", "b"],
... )
>>> df
      a       b
0    HI    Temp
1    HI  Precip
2    NJ    Temp
3    NJ  Precip

>>> pd.MultiIndex.from_frame(df)
MultiIndex([('HI',   'Temp'),
            ('HI', 'Precip'),
            ('NJ',   'Temp'),
            ('NJ', 'Precip')],
           names=['a', 'b'])

Using explicit names, instead of the column names

>>> pd.MultiIndex.from_frame(df, names=["state", "observation"])
MultiIndex([('HI',   'Temp'),
            ('HI', 'Precip'),
            ('NJ',   'Temp'),
            ('NJ', 'Precip')],
           names=['state', 'observation'])