3 Line dice roller

dice_roller.py

#!/usr/bin/python                                                                                                                                              
import sys, random, re                                                                                                                                         
m = re.match(r"(\d*)d(\d*)([-+]?\d*)",sys.argv[1])                                                                                                             
print sum([random.randint(1,int(m.group(2))) for i in range(int(m.group(1)or"1"))]) + (int(m.group(3) or "0"))