出错代码：

#按区域得到每组的数据

key = df[['区域','产品类别']].apply(tuple,axis=1)
gp = df.groupby(key)

for key,g in gp:
    print(f'{key}:{type(g)}')

报错：

TypeError: '<' not supported between instances of 'float' and 'str'

解决方法：

key = df[['区域','产品类别']].apply(tuple,axis=1).astype(str)
gp = df.groupby(key)

for key,g in gp:
    print(f'{key}:{type(g)}')