Well, this is pretty basic stuff, for people interested a little bit more in NumPy I recommend SciPy lectures:
http://scipy-lectures.github.com/intro/numpy/index.html
http://scipy-lectures.github.com/advanced/advanced_numpy/ind...
If you're looking for a more detailed overview of just numpy, the original numpy book (http://www.tramy.us/numpybook.pdf ) is quite good, as well.
np.lookfor('create array')