Check50 says, and I qoute, "timed out while waiting for program to exit" in some of the criterias, I don't understand what infinite loop is causing this. Can you help?

# Simulate a sports tournament

import csv import sys import random

# Number of simluations to run N = 1000000

def main():

    # Ensure correct usage
    if len(sys.argv) != 2:
        sys.exit("Usage: python tournament.py FILENAME")

    teams = []
    # TODO: Read teams into memory from file
    """ with closes the file after we are finished"""
    filename = sys.argv[1]
    with open(filename) as file:
        reader = csv.DictReader(file)
        for team in reader:
            """ access the value for a particular key inside the dictionary"""
            team["rating"] = int(team["rating"])

    counts = {}
    # TODO: Simulate N tournaments and keep track of win counts
    for i in range(N):
        winner = simulate_tournament(teams)
        if winner in counts:
            counts[winner] += 1
            counts[winner] = 1

# Print each team's chances of winning, according to simulation
    for team in sorted(counts, key=lambda team: counts[team], reverse=True):
        print(f"{team}: {counts[team] * 100 / N:.1f}% chance of winning")

def simulate_game(team1, team2):
    """Simulate a game. Return True if team1 wins, False otherwise."""
    rating1 = team1["rating"]
    rating2 = team2["rating"]
    probability = 1 / (1 + 10 ** ((rating2 - rating1) / 600))
    return random.random() < probability

def simulate_round(teams):
    """Simulate a round. Return a list of winning teams."""
    winners = []

    # Simulate games for all pairs of teams
    for i in range(0, len(teams), 2):
        if simulate_game(teams[i], teams[i + 1]):
            winners.append(teams[i + 1])

    return winners

def simulate_tournament(teams):
    """Simulate a tournament. Return name of winning team."""
    # TODO
    """ used to simulate while there isn't one team left"""
    while len(teams) > 1:
        teams = simulate_round(teams)
    return teams[0]["team"]

if __name__ == "__main__":
  • We need some debugging information. What was the scenario used that led to this time out? Can you try using some example cases and values of N first to show what the times you are getting is?
    – UpAndAdam
    Aug 31, 2023 at 14:53
  • I've entered your code into it myself and even on the million case its only taking just over 6 seconds so I am very surprised you are getting a time out and indeed get a timeout with check50 if i use 1 million, but it seems to be fine for 100,000.
    – UpAndAdam
    Aug 31, 2023 at 15:42
  • IMHO they really should have made N a command line argument
    – UpAndAdam
    Aug 31, 2023 at 15:44

1 Answer 1


The problem is that for whatever reason the evaluator is set up such that you can't leave N set to 1000000 for it to pass, it takes too much time. There is no infinite loop. There is nothing wrong with your code.

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