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 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')
count = df.groupby('item_name')['name'].count()
print(count.fillna(0))
for line in sys.stdin:
a = line.split()
print(int(a[0]) + int(a[1]))
