Project pages
Python
http://python.org/
NumPy
http://www.numpy.org/
SciPy
http://www.scipy.org/
matplotlib
http://matplotlib.org/
PyMC
https://github.com/pymc-devs/pymc
EPD Free
http://www.enthought.com/products/epd_free.php
Learn Python the Hard Way
http://learnpythonthehardway.org/
Python course: Introduction into NumPy
http://www.python-course.eu/numpy.php