import pylab
import numpy
pylab.ion()
fig = pylab.figure()
ax = fig.add_subplot(111)
t=numpy.arange(0,1,.01)
s=numpy.sin(2*numpy.pi*t)
c = numpy.cos(2*numpy.pi*t)
ax.plot(t,s,color='blue',lw=2)
ax.plot(t,c,color='green',lw=2)
pylab.draw()
print ax.lines
print 'last line color: ', ax.lines[-1].get_color()
raw_input("Any key to change last line to red ")
ax.lines[-1].set_color('red')
pylab.draw()