题解 | #牛客用户刷题量的方差与提交次数的标准差#

# 导入pandas库
import pandas as pd

# 读取Nowcoder.csv文件,得到DataFrame
nowcoder = pd.read_csv("Nowcoder.csv")

# 获取Num_of_exercise列
num_of_exercise = nowcoder["Num_of_exercise"]

# 计算Num_of_exercise列的方差
exercise_var = num_of_exercise.var()

# 获取Number_of_submissions列
number_of_submissions = nowcoder["Number_of_submissions"]

# 计算Number_of_submissions列的标准差
submissions_std = number_of_submissions.std()

# 输出方差,保留2位小数
print("%.2f" % exercise_var)

# 输出标准差,保留2位小数
print("%.2f" % submissions_std)