atzzz.py

import bpy
from mathutils import Vector, Color
from random import random as rnd

curves = (c for c in bpy.data.objects if c.type == 'CURVE')

mat = bpy.data.materials['curve_material']
for c in curves:
    c.data.bevel_depth = 0.00
    c.active_material = mat
    c['first_vertex'] = Vector(c.data.splines[0].points[0].co[:3])
    c['tcol'] = Color((rnd(), rnd(), rnd()))
    c['tcol_r'] = rnd()
    c['tcol_g'] = rnd()
    c['tcol_b'] = rnd()