Sum from random list in python

Question

I have created a random list of 60 numbers, I don't know the numbers contained in the list. I'm asked to find any combination of three numbers from the list that sum to zero. What can I do? That's my code:

import random
import itertools
result = []

for x in range (-30, 30):
   num = random.randint(-30, 30)
   while num in result:
     num = random.randint(-30, 30)
     result.append(num)
        result = [seq for i in range(len(result), 0, -1) for seq in itertools.combinations(result, i) if sum(seq) == 0]
print result

Answer 1

There is a function combinations in itertools and it can be used to generate combinations.

import random
import itertools
# Generate a random list of 30 numbers
mylist = random.sample(range(-50,50), 30)

combins = itertools.combinations(mylist, 3)
interested = list(filter(lambda combin: sum(combin) == 0, combins))
print(interested)

Note that the results from filter() and itertools.combinations() are iterables and list() is needed to convert the iterable to a list.

lambda expression lambda combin: sum(combin) == 0 is used to keep the combinations which the sum is zero from combins

itertools.combinations(): https://docs.python.org/3.6/library/itertools.html#itertools.combinations

filter(): https://docs.python.org/3.6/library/functions.html?highlight=filter#filter