@property<EOL><INDENT>def ndim(self):<DEDENT>
return self._data.ndim<EOL>
Return an int representing the number of axes / array dimensions.

Return 1 if Series. Otherwise return 2 if DataFrame.

See Also
--------
ndarray.ndim : Number 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