print(Nowcoder['Name'].str.len())

print(round((Nowcoder[Nowcoder['Num_of_exercise']>10]['Num_of_exercise'] / Nowcoder[Nowcoder['Num_of_exercise']>10]['Number_of_submissions']).max(),3))

import pandas as pd Nowcoder = pd.read_csv('Nowcoder.csv', sep=',') sum = Nowcoder['Achievement_value'].sum() print(Nowcoder[Nowcoder['Level'] == 7]['Achievement_value'] / sum)

import pandas as pd Nowcoder = pd.read_csv('Nowcoder.csv', sep=',') print(round(Nowcoder['Num_of_exercise'].var(),2)) print(round(Nowcoder['Num_of_exercise'].std(),2))

print(Nowcoder[Nowcoder['Level']==7]['Achievement_value'].max() - Nowcoder[Nowcoder['Level']==7]['Achievement_value'].min())

print(int(Nowcoder[Nowcoder['Num_of_exercise'] >= 10]['Level'].median()))

print(round(Nowcoder[Nowcoder['Language']=='Python']['Number_of_submissions'].mean(),1))

print(Nowcoder['Continuous_check_in_days'].max()) print(Nowcoder['Continuous_check_in_days'].min())

print(Nowcoder['Language'].value_counts())

print(Nowcoder[(Nowcoder['Language'] == 'CPP') & (Nowcoder['Level'] == 7) & (Nowcoder['Graduate_year'] != 2018)])

print(Nowcoder[(Nowcoder['Language']=='Java') & (Nowcoder['Graduate_year']==2020)])

哈哈哈