Why the code can't be executed

Question

I can't execute this code please help >▂<

It's even in try yourself

https://code.sololearn.com/cm4Job1EHTNb/?ref=app

Answer 1

You literally asked this exact same question 3 hours ago, but for whatever reason you deleted it, and it was then I provided you with basically the exact same answer

https://code.sololearn.com/cgLGnyE10IS6/#py

Answer 2

You have to capitalize column names:
import pandas as pd
df=pd.read_csv('https://sololearn.com/uploads/files/titanic.csv')
small_df= df[['Age','Sex','Survived']]
print (small_df.head())

Answer 3

Very thankful for your help 😌😌😊

Answer 4

Actually before i saw answer I accidentally deleted it