Some popular websites to practice Python programming:

1. LeetCode (leetcode.com) – Offers a vast collection of coding problems, including Python-specific problems. It's great for preparing for technical interviews.

2. HackerRank (hackerrank.com) – Provides challenges across multiple domains, including Python. It has a wide range of problems, from beginner to advanced levels.

3. CodeWars (codewars.com) – A community-driven platform with Python challenges at varying levels of difficulty. It has a gamified approach to problem-solving.

4. Exercism (exercism.org) – Offers Python challenges and provides mentor-guided learning. It's excellent for in-depth practice.

5. Project Euler (projecteuler.net) – Great for mathematical and algorithmic challenges that can be solved using Python.

6. Real Python (realpython.com) – Besides tutorials, it offers exercises to practice Python in real-world scenarios.

7. Edabit (edabit.com) – Features interactive Python challenges with a focus on bite-sized coding problems.

8. Python.org (python.org) – The official Python website has a section for beginner tutorials, as well as links to advanced topics and exercises.

These platforms should provide a variety of challenges that can help you strengthen your Python skills.