How to assign a color value to face (object) using python

I have the following two functions:

def get_random_color():
    ''' generate rgb using a list comprehension '''
    r, g, b = [random.random() for i in range(3)]
    return r, g, b, 1


def createMeshFromData(name, origin, verts, faces):
    # Create mesh and object
    me = bpy.data.meshes.new(name + 'Mesh')
    ob = bpy.data.objects.new(name, me)
    ob.location = origin
    ob.show_name = True


    # Link object to scene and make active
    scn = bpy.context.scene
    scn.objects.link(ob)
    scn.objects.active = ob
    ob.select = True
    ob.color = get_random_color()

    # Create mesh from given verts, faces.
    me.from_pydata(verts, [], faces)
    # Update mesh with new data
    me.update()
    return ob

createMeshFromData gets its data from a database for verts and faces. Later on it will also get a color value.

So far I am trying to assign a random color using the function get_random_color. I assign this color with ob.color = get_random_color() but this does not seem to work once I press F12 to render.

How to assign a color value to an object?

I am not familiar with blender (coming from matplotlib) and I would apprecite your help.