题解 | #统一最后刷题日期的格式#

import pandas as pd 

df = pd.read_csv('Nowcoder.csv',sep=',',dtype=object)
df = df[['Nowcoder_ID','Level','Last_submission_time']]
df['Last_submission_time'] = pd.to_datetime(df['Last_submission_time']).dt.strftime('%Y-%m-%d')

print(df)