熊猫:在多索引数据中重命名索引标签，如果是NaN

Question

如何替换下面df的内部索引标签？

Question                                 profile_gender. Gender           
Values                                    Male     Female
Question                    Values                                  
XCS_3. Think of a problem?  NaN        25.192318  25.900784

至：

Question                                 profile_gender. Gender           
Values                                    Male     Female
Question                    Values                                  
XCS_3. Think of a problem?  Okay Done   25.192318  25.900784

我失败的尝试：

df.index = df.index.set_levels(['Okay Done'], 1)

什么也不做，甚至不会抛出错误代码

Answer 1

看来我必须替换整个索引，这是非常恼人的。

df.index = pd.MultiIndex.from_tuples([('XCS_3. Think of a problem?', ' Okay Done')],
                                     names=['Question', 'Values'])