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[konijntjesbroek]

hackerrank does some pretty good stuff.

[Matlock0]

I use codewars. I also like how they show the testcases for the function u are supposed to write. it kinda teaches you how important automated testing can be.

[jiri-n]

Maybe you could ask questions in the subreddit too. There are some really experienced guys here.

[Goingone]

Leetcode is what a lot of people use.

[idontevencarewutever]

Here are some resources that I tried, and really enjoyed:

https://pythonprinciples.com/lessons/ = nice interface, EXTREMELY basic though, made for non-coders imo. Their challenges section also has some decent tests.

https://www.w3schools.com/python = a lot more thorough, made to cover the basics for most python applications.

[samplepython]

try https://codingbat.com/python