You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
def largest_num_in_list(arr):
    largest_num = 0
    for num in arr:
        if num > largest_num:
            largest_num = num
    return largest_num

if __name__ == '__main__':
    print(largest_num_in_list([2, 5, 8, 10, 21])) # 21
user
21
assistant