题解 | #牛客网每日正确与错误的答题次数#
牛客网每日正确与错误的答题次数
https://www.nowcoder.com/practice/bd74b186d5954eb69c00ee804cebe364
import pandas as pd
df = pd.read_csv('nowcoder.csv')
df.date = pd.to_datetime(df.date).dt.date
array = [df.result.tolist(),df.date.tolist()]
idx = pd.MultiIndex.from_arrays(array,names=['result','year-month-day'])
s = pd.Series(df.question_id.tolist(),index=idx)
print(s.groupby(level=['result','year-month-day']).count())
