creating a multi colored graph with respect to the values in y-axis

[Ravikanth]

Hi all,

I am a beginner in python. I need to implement a graph with multiple
colors in it.
In a way, I have a function which varies with respect to time and
amplitude. I have time on x-axis and amplitude on y-axis. Lets say the
amplitude of the graph is divided into 4 ranges, say 1-3,3-5,5-9,
10-3. I need to plot the graph in such a way that, when the values of
amplitude are in a particular range say 1-3, the color of graph should
be red.
If the amplitude is in the range from 3-5 the graph need to be in
color blue etc..,

Can somebody guide me on this, how to achive this functionality.

Regards,
Ravikanth