from random import random

def piece_builder(p):
    def piece():
        r = random()
        if r < p:
            return "pile"
        return "face"

    return piece

piece1 = piece_builder(0.5)
piece2 = piece_builder(0.4)
piece3 = piece_builder(0.2)

def de_builder(steps):
    assert sorted(steps) == steps
    assert steps[-1] == 1
    def de():
        r = random()
        for i in range(6):
            if r < steps[i]:
                return i+1
    return de

de1 = de_builder([(i+1)*1/6 for i in range(6)])
de2 = de_builder([0.1, 0.2, 0.3, 0.4, 0.5, 1])
de3 = de_builder([0.01, 0.3, 0.4, 0.6, 0.8, 1])