题解 | #统计运动会项目报名人数(二)#
统计运动会项目报名人数(二)
https://www.nowcoder.com/practice/737d224c9cce482fb56ff812d04e79ab
import pandas as pd
d1=pd.read_csv('items.csv')
d2=pd.read_csv('signup.csv')
d=pd.merge(d1,d2,how='left',on='item_id')
print(d.groupby('item_name')['item_name'].count())
#print(d.groupby('item_name')['item_name'].sum())
