Follow these steps to become a certified python programmer:
Enroll for an online course from reputed institute
Learn the fundamentals of Python
Study OOP, expressions, data types, looping, etc.
Functions, operations, and class defining
Get to know the Machine Learning algorithms in Python
Complete the assignments to for Course completion certificate
Be equipped for the Python professional certification
If you are looking for a certification course, I recommend this Python Certification program by Intellipaat.
You can watch this video on Python career path to understand more: