Return an int representing the number of axes / array dimensions.
Return 1 if Series. Otherwise return 2 if DataFrame.
See also
ndarray.ndimNumber of array dimensions.
Examples
>>> s = pd.Series({'a': 1, 'b': 2, 'c': 3})
>>> s.ndim
1
>>> df = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})
>>> df.ndim
2
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.DataFrame.ndim.html