Hello all, Here is a bit of code that I am getting my head around. It's out of a book that I am using to teach myself matplotlib, a python library for making graphs etc. The following code is using an object-orientated approach in preparation for embedding the graph within an GUI application. <code> #!/usr/bin/env python # -*- coding: utf-8 -*- import matplotlib.pyplot as plt import numpy as np x = np.arange(0, 10, 0.1) y = np.random.randn(len(x)) fig = plt.figure() ax = fig.add_subplot(111) l, = plt.plot(x, y) t = ax.set_title('random numbers') plt.show() </code> The line l, = plt.plot(x, y) has got me slighty confused because l = plt.plot(x, y) also works, without the trailing comma after the l I was wondering if any Python coders might comment to the comma's significance. I've scanned my four books on Python and can't find any reference. Cheers, Chris