Matplotlib is the preferred 2D plotting library for Python users. The following is a collection of very simple programs from Matplotlib's examples directory.
For more examples you may want to check out the Matplotlib Cookbook and the official matplotlib tutorial at http://matplotlib.sf.net/tutorial.html
Simple plot

#!/usr/bin/env python """ Example: simple line plot. Show how to make and save a simple line plot with labels, title and grid """ import numpy import pylab t = numpy.arange(0.0, 1.0+0.01, 0.01) s = numpy.cos(2*2*numpy.pi*t) pylab.plot(t, s) pylab.xlabel('time (s)') pylab.ylabel('voltage (mV)') pylab.title('About as simple as it gets, folks') pylab.grid(True) pylab.savefig('simple_plot') pylab.show()