Convert a MultiIndex to an Index of Tuples containing the level values.
Index with the MultiIndex data represented in Tuples.
See also
MultiIndex.from_tuplesConvert flat index back to MultiIndex.
Notes
This method will simply return the caller if called by anything other than a MultiIndex.
Examples
>>> index = pd.MultiIndex.from_product(
... [['foo', 'bar'], ['baz', 'qux']],
... names=['a', 'b'])
>>> index.to_flat_index()
Index([('foo', 'baz'), ('foo', 'qux'),
('bar', 'baz'), ('bar', 'qux')],
dtype='object')
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.MultiIndex.to_flat_index.html