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我有以下可重现的代码，我在其中创建了一个字典，我将它按大都会区这一因子分组，并使用该agg()函数按因子确定平均值：

dictionaryMLB = {'Metropolitan area': ['New York City','New York City','Los Angeles', 'Los Angeles', 'San Francisco Bay Area','San Francisco Bay Area','Chicago','Chicago'],
              'Population (2016 est.)[8]': [20153634, 20153634, 13310447, 13310447,6657982,6657982,9512999,9512999],
              'MLB':['Yankees','Mets','Dodgers','Angels','Giants','Athletics','Cubs','White Sox']}

df = pd.DataFrame(dictionaryMLB)

df.groupby('Metropolitan area').agg([np.mean])

我的输出如下：

                     Population (2016 est.)[8]
                           mean
Metropolitan area   
Chicago                   9512999
Los Angeles               13310447
New York City             20153634
San Francisco Bay Area    6657982

我想避免列中的双重名称，而只保留Population (2016 est.)[8]或mean获取例如以下内容：

                            mean
Metropolitan area   
Chicago                   9512999
Los Angeles               13310447
New York City             20153634
San Francisco Bay Area    6657982

我应该如何进行？

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