Although pandas is a very important package for data analysis, it can work in conjunction with two other packages: SciPy and NumPy.
SciPy
scipy.cluster
scipy.constants
scipy.fftpack
scipy.integrate
scipy.interpolate
scipy.io
scipy.lib
scipy.linalg
scipy.misc
scipy.optimize
scipy.signal
scipy.sparse
scipy.spatial
scipy.special
scipy.stats
scipy.weave