题解 | #牛客用户刷题量的方差与提交次数的标准差#
牛客用户刷题量的方差与提交次数的标准差
https://www.nowcoder.com/practice/4ca5272bc96c453b9c70fccc039a0679
import pandas as pd
df = pd.read_csv("Nowcoder.csv")
print("%.2f"%df['Num_of_exercise'].var())
print("%.2f"%df['Num_of_exercise'].std())
