问Python3.7，dataframe统计求助（元组为key的dict转化）？

>>>name    type
    a        A
    a        A
    a        B
    a        B
    a        C
    b        A
    b        A
    b        C

>>>{a:{A:2, B:2, C:1}, b:{A:2, C:1}}

>>>df1=df.groupby(['name','type'])[['type']].count()
>>>name type     type
     a    A        2
          B        2
          C        1
     b    A        2
          C        1
>>>df1.to_dict(orient='index')
>>>{('a', 'A'): {'type': 2}, ('a', 'B'): {'type': 2}, ('a', 'C'): {'type': 1}, 
     ('b', 'A'): {'type': 2}, ('b', 'C'): {'type': 1}}