题解 | #统计运动会项目报名人数#
统计运动会项目报名人数
https://www.nowcoder.com/practice/f992129b6da245d5bc5efb2f95289516
import pandas as pd
item = pd.read_csv("items.csv")
signup = pd.read_csv('signup.csv')
data = pd.merge(item,signup,on='item_id')
a = data.groupby(by="item_name")['item_id'].apply('count')
print(a)
