Build a Probability Calculator Project - Failing on test 4

Python
1

Tell us what’s happening:

I made a code that i think works fine, but fails the last test “Expected experiment method to return a different probability.” Could you help me find out what couses this problem?
Here is a picturo of my console:

log
log670×736 132 KB

Your code so far

import copy
import random

class Hat:
    def __init__(self, **contents):
        self.contents = [colour for colour, amount in contents.items() for _ in range(amount)]

    def draw(self, num):
        if num > len(self.contents):
            drawn_balls = self.contents
            self.contents = []
            return drawn_balls
        drawn_balls = []
        for _ in range(num):
            ball = (random.choice(self.contents))
            drawn_balls.append(ball)
            self.contents.remove(ball)
        return drawn_balls

def experiment(hat, expected_balls, num_balls_drawn, num_experiments):
    successes = 0
    for _ in range(num_experiments):
        hat_copy = Hat(**{color: hat.contents.count(color) for color in set(hat.contents)})
        drawn_balls = hat_copy.draw(num_balls_drawn)
        drawn_counts = {ball: drawn_balls.count(ball) for ball in drawn_balls}
        if all(drawn_counts.get(colour, 0) >= balls for colour, balls in expected_balls.items()):
            successes += 1
    return successes/num_experiments


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

you may need to try other random methods to see if it returns a different priobability

1 Like
3

Okay i used the secrets package instead of random, I only changed
ball = (random.choice(self.contents))
this line to
ball = (secrets.choice(self.contents))
Now the test 4 is successful, but test 2 is wrong. Any idea why?

4

If a hat has 5 balls and you draw 1, then the contents of the hat would now be 4 balls, right?

5

Thank you for the answers, i dont know what happened, i kept running the tests again and again then it accepted all of them.

6

if your app doesn’t reliably pass the tests maybe there are some issues

also you should still use the random package, but try different methods