题解 | #Python用户的平均提交次数#

import pandas as pd 

#读文件
now = pd.read_csv('Nowcoder.csv')
#'Language'为Python的人
n = now[now['Language'] == 'Python']
#用mean()函数求平均值
av = n['Number_of_submissions'].mean()
#输出保留一位小数
print("%.1f"%av)