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 sys
import pandas as pd
items = pd.read_csv('items.csv')
signup = pd.read_csv('signup.csv')
df = items.merge(signup, how = 'left', on = 'item_id')
print(df.groupby('item_name')['name'].count())
for line in sys.stdin:
a = line.split()
print(int(a[0]) + int(a[1]))
