If you are looking for books, check out:

Intermediate:

• Beyond the Basic Stuff with Python — Best Practices, Tools, and Techniques, OOP, Practice Projects
• Pydon'ts — Write elegant Python code, make the best use of the core Python features
• Python Distilled — this pragmatic guide provides a concise narrative related to fundamental programming topics such as data abstraction, control flow, program structure, functions, objects, and modules

Advanced:

• Fluent Python — takes you through Python’s core language features and libraries, and shows you how to make your code shorter, faster, and more readable at the same time
• Serious Python — deployment, scalability, testing, and more
• Practices of the Python Pro — learn to design professional-level, clean, easily maintainable software at scale, includes examples for software development best practices
• Intuitive Python — productive development for projects that last