pandas group分组与agg聚合
import pandas as pd dfpd.DataFrame({Country:[China,China,India, India, America, Japan, China, India], Income:[10000, 10000, 5000, 5002, 40000, 50000, 8000, 5000], Age:[5000, 4321, 1234, 4010, 250, 250, 4500, 4321]})#依次是函数、字典、列表 df
