One of the best books to learn python

Official Python Docs
https://docs.python.org/3/

Tools:
https://docs.python-guide.org/en/latest/dev/virtualenvs/
https://www.pythonforbeginners.com/basics/python-pip-usage

Practice:
https://www.practicepython.org/
https://www.hackerrank.com
https://wiki.python.org/moin/PythonDecorators

Python GUI FAQ

https://docs.python.org/3/faq/gui.html

👨‍💻Websites to Practice Python

Python Basics 👇:
1. https://codingbat.com/python
2. https://www.hackerrank.com/
3. https://www.hackerearth.com/practice/

Practice Problems set :
4. https://projecteuler.net/archives
5. https://www.codeabbey.com/index/task_list
6. https://www.pythonchallenge.com/

Python course by Google

https://developers.google.com/edu/python

No registration or download needed.

Learning Python FREE BOOK
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https://cfm.ehu.es/ricardo/docs/python/Learning_Python.pdf

Six Steps to Defining a Function

1. What should your function do? Type a couple of example calls.
2. Pick a meaningful name (often a verb or verb phrase): What is a short answer to "What does
your function do"?
3. Decide how many parameters the function takes and any return values
4. Describe what your function does and any parameters and return values in the docstring
5. Write the body of the function
6. Test your function. Think about edge cases.