Think Stats Probability and Statistics for Programmers in Python (free download)
Plotting:
matplotlib.pyplot tutorial: This short tutorial provides an overview of the basic plotting utilities we will be using.
seaborn: The Seaborn library has some nice additional visualization functions that we may use occasionally.
Pandas:
Learn Pandas A set of lessons providing an overview of the Pandas library.
Python for Data Science Another set of notebook demonstrating Pandas functionality.