题解 | #统一最后刷题日期的格式#

import pandas as pd

# 从 CSV 文件中读取数据并设置索引
df = pd.read_csv("Nowcoder.csv",dtype=object)

# 替换 Last_submission_time 列中的前两个斜杠
df["Last_submission_time"] =  df["Last_submission_time"].str.replace("/","-",n=2)

print(df[["Nowcoder_ID", "Level", "Last_submission_time"]])

字符串替换