Build a Probability Calculator Project - Build a Probability Calculator Project

Python
1

Tell us what’s happening:

Failed:The experiment method should return a different probability.

Even though i get the right output

Your code so far

import copy
import random

class Hat:
    def __init__(self, **balls):
        self.contents = [x for x in balls for _ in range(balls[x])]

    def draw(self, draws):
        result = []

        if len(self.contents) <= draws:
            result = self.contents[:]
            self.contents.clear()
            return result

        for _ in range(draws):
            num = int(random.random()*(len(self.contents)))
            result.append(self.contents[num])
            self.contents.remove(self.contents[num])
        return result
        

def experiment(hat, expected_balls, num_balls_drawn, num_experiments):
    M = 0
    N = num_experiments
    for _ in range(0,N):
        result_ball = {color: 0 for color in expected_balls}
        box = copy.deepcopy(hat)
        for ball in box.draw(num_balls_drawn):
            if ball in expected_balls:
                result_ball[ball] += 1
        if all([result_ball.get(key) >= value for key, value in expected_balls.items()]):
            M += 1 
    return M/N
    





hat = Hat(black=6, red=4, green=3)
probability = experiment(hat=hat,
                  expected_balls={'red':2,'green':1},
                  num_balls_drawn=5,
                  num_experiments=2000)
print(probability)

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Challenge Information:

Build a Probability Calculator Project - Build a Probability Calculator Project

2

How could you say that you get the right output?
AssertionError: 0.262 != 0.272

It’s close to the expected value but different.

3

“Since this is based on random draws, the probability will be slightly different each time the code is run.”
This is part of the instructions.

4

The test considers a certain tolerance but the value you are returning is above it, I didn’t find why yet though.