题解 | #统一最后刷题日期的格式#

import pandas as pd
a = pd.read_csv('Nowcoder.csv', sep=',',dtype=object)
a['Last_submission_time'] = pd.to_datetime(a['Last_submission_time'],format='%Y-%m-%d')
print(a[['Nowcoder_ID','Level','Last_submission_time']])