DIY Python dice-rolling library, with example.

example.sh

# roll 6 ability scores using the worst 4 of 5d6
$ python -c 'from roll import d6; print([d6(5, w=4) for i in range(6)])'
[11, 14, 11, 13, 9, 15]

roll.py

import random

def dN(n):
	return random.randint(1, n)

def roll(n=1, m, x=0, b=None, w=None):
	"""
	Roll N dM dice, adding X to the sum.
	If `b` is an integer, take the highest `b` rolls.
	Or if `w` is an integer, take the lowest `w` rolls.
	"""
	rolls = [dN(m) for i in range(n)]
	rolls.sort()
	if isinstance(b, int):
		rolls = rolls[-b:]
	elif isinstance(w, int):
		rolls = rolls[:w]
	return sum(rolls) + x

# Convenience methods for accessing roll
def d4(n, *args, **kwargs):
	return roll(n, 4, *args, **kwargs)
def d6(n, *args, **kwargs):
	return roll(n, 6, *args, **kwargs)
def d8(n, *args, **kwargs):
	return roll(n, 8, *args, **kwargs)
def d10(n, *args, **kwargs):
	return roll(n, 10, *args, **kwargs)
def d12(n, *args, **kwargs):
	return roll(n, 12, *args, **kwargs)
def d20(n, *args, **kwargs):
	return roll(n, 20, *args, **kwargs)
def d100(n, *args, **kwargs):
	return roll(n, 100, *args, **kwargs)