import random as rd

class Dice():
    def __init__(self, num_faces:int=20):
        self.num_faces = num_faces

    def roll(self):
        return rd.randrange(start=1, stop=self.num_faces+1, step=1)

    def head_or_tails(self):
        result = rd.randint(0,1)
        if result: # true
            return "head" # face
        else:
            return "tails" # pile