Probability calculator, second test
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Jun 12
Hello everyone, I am currently doing the probability calculator challenge and cannot pass the second and third tests. Whilst I already have an idea of what is wrong in my code for the third test after reading posts from other people, I still am not sure why I am failing the second test, and any help would be appreciated. Many thanks!
Here is my code and below I have copied the text displayed by the failed second unit test:
""" This is a probability calculator. It has a Hat class that takes a number of arguments that
specify the number of balls of each colour that are in the hat, and a draw method that randomly
draws a number of balls WITHOUT REPLACEMENT.
There is then an experiment class that returns the probability of drawing balls of a specific colour
if we repeat the experiment a specified number of times"""
import random
import copy
class Hat:
""" This clas defines the Hat for whoch balls can be placed in, and a method to draw them """
def __init__(self, **kwargs):
self.hat = kwargs
self.contents = []
ball_colour_freq = kwargs.values()
self.total_balls = sum(ball_colour_freq)
for key, value in kwargs.items():
for i in range(value):
self.contents.append(key)
def draw(self, balls_to_be_drawn):
""" This is function that randomly draws a specified number of balls
(called balls_to_be_drawn) from the hat."""
self.balls_to_be_drawn = balls_to_be_drawn
drawn = dict.fromkeys(self.hat.keys(), 0)
for i in range(balls_to_be_drawn):
# drawing a random ball
ball_drawn = random.choice(list(self.hat))
self.hat[ball_drawn] =  1
drawn[ball_drawn] = + 1
drew = list(drawn.keys())
return drew
def experiment(hat, expected_balls, num_balls_drawn, num_experiments):
#must usee copy hat in here
""" a function that returns the probability of drawing certain types of balls over
n experiments"""
match = 0
balls_drawn_in_experiment_set = set(hat.draw(num_balls_drawn))
expected_balls_set = set(expected_balls.keys())
expected_balls_set = set(expected_balls.keys())
for i in range(num_experiments):
copy.deepcopy(hat)
if set(balls_drawn_in_experiment_set).intersection(set(expected_balls_set)) != 0:
match = + 1
copy.deepcopy(hat)
probability = match / num_experiments
return probability
Traceback (most recent call last):
File “/home/runner/boilerplateprobabilitycalculator5/test_module.py”, line 16, in test_hat_draw
self.assertEqual(actual, expected, ‘Expected hat draw to return two random items from hat contents.’)
AssertionError: Lists differ: [‘red’, ‘blue’] != [‘blue’, ‘red’]
First differing element 0:
‘red’
‘blue’

[‘red’, ‘blue’]

[‘blue’, ‘red’] : Expected hat draw to return two random items from hat contents.