Based on the career opportunities you are looking, you have to learn different skills in Python. For Web development, Python developer should know Web Frameworks, Django Or Flask, HTML, CSS, MVC-MVT Architecture, Server Side development, Front end skills, and Script Writing.
For Automation Testing, Python developer should know Selenium Web Driver, Selenium Grid, and TestNG
For Data Science, Python developer should know Mathematics And Statistics, Libraries (Matplotlib, Numpy, Pandas, Seaborn), Data Visualization, Interpretation and Data Analysis, Manipulation of Data, and Database Knowledge
After learning the skills required, start a project using these skills and post them on GitHub and LinkedIn. Prepare a resume mentioning the certifications and projects and start applying for entry-level python developer roles.
If you are looking for a good certification for Python, then take up this well-structured Python Training course by Intellipaat instructor-led classes, certification, and job assistance.
Also, watch this video on how to become a python developer to understand in detail.