import pandas as pd

df = pd.read_csv("Nowcoder.csv",sep=',')
pd.set_option("display.width", 300)  # 设置字符显示宽度
pd.set_option("display.max_rows", None)  # 设置显示最大行
pd.set_option("display.max_columns", None)
fill_values = {
    "Graduate_year": df["Graduate_year"].max(),
    "Language": "Python",
    "Achievement_value": df["Achievement_value"].mean().round(0),
}

print(df.fillna(fill_values))