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Solution Review: Check Sum

Understand how to implement nested loops in Python to find all possible pairs in a list for the Check Sum problem. This lesson reinforces Python basics such as loops and the range function, preparing you for deeper topics like arrays.

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Solution #

Python 3.5
def check_sum(num_list, num):
  for first_num in range(len(num_list)):
    for second_num in range(first_num + 1, len(num_list)):
      if num_list[first_num] + num_list[second_num] == num:
        return True
  return False
num_list = [10, -14, 26, 5, -3, 13, -5]
print (check_sum(num_list, -8))
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