Learn Python programming

Functions can be called anywhere in a Python program, including calling functions within other functions. Functions provide a couple of benefits: Functions allow the same piece of code to run multiple times.
https://viteac.blogspot.com/2021/05/python-functions-what-function-is-and.html

https://viteac.blogspot.com/2021/05/python-statements-ifelif-else-how-does.html

Learn what statements if, elif,else are, how and when to use them.



What is if,elif, else in Python
If, elif, else statements allow to execute code based on decision making.

If you want to remove duplicates from list, there's a few ways to to that.
Explained: How to remove duplicates from list in Python.

You have a string in which you'd like to find all indexes in which a specific character occur. Below article explains how to do it with index() method.
https://viteac.blogspot.com/2021/02/python-find-indexes-of-specific.html

https://www.tkqlhce.com/click-7234655-14381510?url=https%3A%2F%2Froutledge.com%2F9780123785787&cjsku=K16172

Sets similarly to list have also built in methods to use on sets however these methods are different and I'll explain them to you with examples.
https://viteac.blogspot.com/2021/02/set-methods-in-python.html

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Python has build in methods to work with dictionaries.
Learn them all so you can work with Dictionaries confidently

https://viteac.blogspot.com/2021/02/dictionary-methods-in-python.html
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https://viteac.blogspot.com/2021/01/what-is-while-loop-in-python-how-and.html

https://viteac.blogspot.com/2021/01/convert-bytes-to-string-in-python.html

https://viteac.blogspot.com/2021/01/python-how-to-create-list-from-user.html