Get the ‘info axis’ (see Indexing for more).
This is index for Series, columns for DataFrame.
Info axis.
Examples
>>> d = pd.DataFrame(data={'A': [1, 2, 3], 'B': [0, 4, 8]},
... index=['a', 'b', 'c'])
>>> d
A B
a 1 0
b 2 4
c 3 8
>>> d.keys()
Index(['A', 'B'], dtype='object')
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.DataFrame.keys.html