Python 在多级列中，对特定较低级别的类别重新排序

我得到了一个带有多层列的多层数据帧，df.Columns是

ultiIndex([(   'county',                                          ''),
        (    'month',                                          ''),
        (   'Gender',                 'Declined to self-identify'),
        (   'Gender',                                    'Female'),
        (   'Gender',                                      'Male'),
        (   'Gender',             'Non-Binary / Gender expansive'),
        (      'age',                                       '0-4'),
        (      'age',                                     '11-13'),
        (      'age',                                     '15-18'),
        (      'age',                                     '19-24'),
        (      'age',                                     '25-34'),
        (      'age',                                     '35-44'),
        (      'age',                                     '45-54'),
        (      'age',                                      '5-10'),
        (      'age',                                     '55-64'),
        (      'age',                                   '65_vove'),
        (      'age',                                    'Unkown'),
        (     'race',          'American Indian or Alaska Native'),
        (     'race',                                     'Asian'),
        (     'race',                 'Black or African American'),
        (     'race', 'Native Hawaiian or other Pacific Islander'),
        (     'race',                                   'UNKnown'),
        (     'race',                                     'White'),
        ('Ethnicity',                        'Hispanic or Latinx'),
        ('Ethnicity',                    'Non Hispanic or Latinx'),
        ('Ethnicity',                                   'Unknown')],
       names=['variable', 'value'])

我想把比赛重新排序为

race_order = ['Black or African American', 'American Indian or Alaska Native','Asian',
              'Native Hawaiian or other Pacific Islander','White', 'UNKnown']