//嵌套字典的键值取值\\

'province_score_min': {'11': {'school_id': '661', 'province_id': '11', 'type': '3', 'min': '638.00', 'year': '2021'}, '12': {'school_id': '661', 'province_id': '12', 'type': '3', 'min': '666.00', 'year': '2021'}, '13': {'school_id': '661', 'province_id': '13', 'type': '2073', 'min': '637.00', 'year': '2021'}}

我想打印出：
11：661:638.00:2021
12：661:666.00:2021
13：661:637.00:2021
也就是说想要获取内外层字典里面的所有数据，并且以字符串的形式输出，感谢各位啦！

d1 = {'11': {'school_id': '661', 'province_id': '11', 'type': '3', 'min': '638.00', 'year': '2021'},
      '12': {'school_id': '661', 'province_id': '12', 'type': '3', 'min': '666.00', 'year': '2021'},
      '13': {'school_id': '661', 'province_id': '13', 'type': '2073', 'min': '637.00', 'year': '2021'}}

for key, value in d1.items():
    print('{0}: {1}:{2}:{3}'.format(key, value.get('school_id'), value.get('min'), value.get('year')))

那就对于外层字典,做遍历,先打出字典键,然后对于值对应的字典再进行一次遍历