How do I master python from scratch for free?

online resources and all for free. Here are a few free resources -

1. Online courses - https://www.coursera.org/learn/python, https://www.coursera.org/course/... , https://www.coursera.org/course/...
2. A very basic online course - Python
3. Interactive Tutorial - Learn Python - Free Interactive Python Tutorial
4. Written Tutorials and Lessons - Learn Python The Hard Way
5. Learn python syntax quickly - Learn python in Y Minutes
6. The best resource really is the Python Docs - Python 2.7.11rc1 documentation - It is really vast and contains references to each and every library function.

Here is a list of the best resources  to follow to learn python -

1. MIT OCW - MIT uses python for teaching major portion of their courses including introduction to computer science, introduction to algorithms, data structures and advanced data structures.
1. MITx 6.00x : Introduction to Computer Science and Programming Using Python
2. MIT Introduction to algorithms Introduction to Algorithms (SMA 5503)
3. MIT Introduction to Algorithms
4. MIT 6.851 - Advanced Data Structures
2. Python Book - Welcome to Python for you and me , Amazing hands on approach
3. Google’s Python Class - Google's Python Class Covers advanced topics like yield, generators etc