This is free but it is Python 2.X not 3.X:
codecademy.com/learn/learn-python
It should teach you the basics of Python in a tutorial.
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I actually learnt programming 7 years ago with the codecademy Python class after a career in marketing. I'm now a confirmed Data Engineer. I feel blessed.
I believe there is the 3.x variant available [0]
Would suggest way better resources found in /r/learnpython