title: finding a sum of X numbers within a list (Python)
body: <p>i'm trying to find a combination for a sum inside a list of integers.</p>
  
  <p>the amount of numbers that contain the sum is limited by a variable, so for example in the list -</p>
  
  <p>[5,2,3,9,1], i would like to find the sum of 10, with only 2 numbers.</p>
  
  <p>so that the program would print out [9,1].</p>
  
  <p>I'm new to python, is there an easy way of doing it? </p>
  
  <p>thank you.</p>