题解 | #牛客网每日正确与错误的答题次数#

import pandas as pd 
df = pd.read_csv('nowcoder.csv',sep=',')
df['year-month-day'] = pd.to_datetime(df.date.str[:10])#接触到新写法
data = df.groupby(['result','year-month-day']).count().question_id#计算出每天的问题提交结果
print(data)