Build a Probability Calculator Project - Build a Probability Calculator Project

Python
1

Tell us what’s happening:

I get the following error (the ‘draw’ method should behave correctly when the number of balls to extract is bigger than the number of balls in the hat).
I currently return the required, I have also tried the .copy() function from the import, but the third error is still there

Your code so far

import copy
import random

class Hat:
    def __init__(self, **hats):
        self.contents = []
        for key, val in hats.items():
            for i in range(val):
                self.contents.append(key)
        #print(self.contents)

    def draw(self, num):
        if num >= len(self.contents):
            return self.contents
        else:
            drawnlist = []
            for i in range(num):
                drawn = random.sample(self.contents, 1)
                drawnlist += drawn
                for ball in drawn:
                    if ball in self.contents:
                        self.contents.remove(ball)
                    #print(drawn)
            #print(drawnlist)
            return drawnlist

def experiment(hat, expected_balls, num_balls_drawn, num_experiments):
    count = 0
    for experiment in range(num_experiments):
        expectedlist = []
        for color, num in expected_balls.items():
            for j in range(num):
                expectedlist.append(color)
        #print(expectedlist)
        newhat = copy.deepcopy(hat)
        samplelist = newhat.draw(num_balls_drawn)
        for color in samplelist:
            if color in expectedlist:
                expectedlist.remove(color)
        if len(expectedlist) == 0:
            count += 1
    probability = count / num_experiments
    #print(probability)
    return probability

    

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

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Challenge Information:

Build a Probability Calculator Project - Build a Probability Calculator Project

2

When the number of balls to draw is higher than the number of balls in the hat, you should empty the hat anyway. Returning self.contents is not enough to pass that test.

1 Like
3

Thank You, I first created a new variable and assigned it self.contents then emptied it before returning the variable.

4

brother did u overcame with your problem because i am also facing same error what should i do

5

Please open a new topic.

If you have a question about a specific challenge as it relates to your written code for that challenge and need some help, click the Ask for Help button located on the challenge (it looks like a question mark). This button only appears if you have tried to submit an answer at least three times.

The Ask for Help button will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.

Thank you.