xa- 1. https://www.freecodecamp.org/learn/data-analysis-with-python/#data-analysis-with-python-course 2. https://www.hackerrank.com/domains/python 3. https://www.hackerearth.com/practice/python/getting-started/numbers/practice-problems/ 4. https://learnpython.org/ 5. https://www.w3schools.com/python/python_exercises.asp 6. https://pythonbasics.org/exercises/ 7. https://www.geeksforgeeks.org/python-programming-language/learn-python-tutorial