python pandas学習中の初心者です。  
<https://note.nkmk.me/python-pandas-where-mask/>

こちらのサイトを参考にして `print(df < 0)` を実行したところ、下記のエラーが表示されます。  
回避方法をご教授お願いします。

DataFremeデータサンプル

```

    >>> df
        A  B  C   D
    0 -20  1  a -20
    1 -10  2  b   2
    2   0  3  b   3
    3  10  4  a  10
    4  20  5  c   5
    
```

エラーが出る部分

```

    >>> print(df < 0)
    Traceback (most recent call last):
      File "<pyshell#71>", line 1, in <module>
        print(df < 0)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 1579, in f
        res = self._combine_const(other, func)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\frame.py", line 5418, in _combine_const
        return ops.dispatch_to_series(self, other, func)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 596, in dispatch_to_series
        new_data = expressions.evaluate(column_op, str_rep, left, right)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\computation\expressions.py", line 221, in evaluate
        return _evaluate(op, op_str, a, b, **eval_kwargs)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\computation\expressions.py", line 70, in _evaluate_standard
        return op(a, b)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 570, in column_op
        return {i: func(a.iloc[:, i], b) for i in range(len(a.columns))}
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 570, in <dictcomp>
        return {i: func(a.iloc[:, i], b) for i in range(len(a.columns))}
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 1229, in wrapper
        res = na_op(values, other)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 1091, in na_op
        result = _comp_method_OBJECT_ARRAY(op, x, y)
      File "C:\Users\XXXXX\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\ops\__init__.py", line 1069, in _comp_method_OBJECT_ARRAY
        result = libops.scalar_compare(x, y, op)
      File "pandas/_libs/ops.pyx", line 96, in pandas._libs.ops.scalar_compare
    TypeError: '<' not supported between instances of 'str' and 'int'
    
```
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question
python pandas
pandas Typeエラー