matplotlib python: How do you change the background color of a line plot according to a given column? Say I have the following data file
1. 0 4. 0 2. 0 1. 1 2. 1 3. 1 3. 2 1. 2 2. 2
The first column represents the y-values, and the 2nd column should control the background color. Say, it plots the (black) line on a white-gray alternating background (zebra-like) as proceeding further in x-direction, where the transition in color occurs anytime the integer in
the 2nd column increments. Or other possible solution: Use 2nd column as function argument to determine background color.
How would one do this with matlibplot?