AttributeError：[Pandas]'DataFrame'对象没有属性'mode'

Question

关注documentation我正在尝试采用pandas数据帧列的模式，但收到错误：AttributeError: 'DataFrame' object has no attribute 'mode'。这是一个可重复的例子：

import pandas as pd
df = pd.DataFrame({"A": ["A", "A", "B", "A", "B"], "B": [20, 30, 10, 40, 50], "C": [32, 234, 23, 23, 42523]})


df.mode()

这是追溯：

    df.mode()
  File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 2088, in __getattr__
    (type(self).__name__, name))
AttributeError: 'DataFrame' object has no attribute 'mode'

如何使用列模式？