How to Flatten a List of Lists in Python Quiz - Real Python
Briefly

In this quiz, you'll test your understanding of how to flatten a list in Python. You'll write code and answer questions to revisit the concept of converting a multidimensional list, such as a matrix, into a one-dimensional list.
The quiz contains 7 questions, no time limit, and awards 1 point for each correct answer. At the end, you receive a total score with a maximum of 100%. Good luck!
Read at Realpython
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