Intellipaat's has a large repository of online resources for learning Python their website.
Here's a tutorial blog series you can refer to get started with Python.
Once you get a good grasp over the basic concepts of Python programming language, you can go ahead and go for advanced concepts. To get in depth, industry level understanding on what skill set Python developers are required to have in order to build a career out of this, you can refer to this Python Certification Course designed by industry experts.