Why Won't it Work!?

import random

COLORS = ['red', 'yellow', 'pink', 'green']

class Monster:

min_hit_points = 1
max_hit_points = 1
min_experience = 1
max_experience = 1
weapon = 'sword'
sound = 'roar'

def __init__(self, **kwargs):
    self.hit_points = random.randint(self.min_hit_points, self.max_hit_points)
    self.experience = random.randint(self.min_experience, self.max_experience)
    self.color = random.choice(COLORS)

    for key, value in kwargs.items():
        setattr(self, key, value)

def battlecry(self):
    return self.sound.upper()

This thing if formatting my copied and pasted code from Workspaces all wonky so hopefully you can read it OK.

My problem is I can't get the function that generates the hit_points, experience and color attributes to work or the function to change the sound to upper case. I've typed and retyped the code whilst rewatching the video in Workspaces, Pycharm and the Python 3.5 IDLE and in all cases if I create a monster and call the hit_points, experience or color attributes it tells me it does not exist.

Traceback (most recent call last): File "<input>", line 1, in <module> AttributeError: type object 'Monster' has no attribute 'hit_points'

In Pycharm if you bring up the "show variables" window it shows my monster has a weapon, sound (all in lower case), min_hit_points, max_hit_points, min_experience and max_experience attributes instead of weapon, sound (in upper case) hit_points, experience and color attributes like i'm expecting.

Hopefully someone can point out what's going wrong because I have no clue.