title: Python adding an integer to a list
body: <p>I am trying to add 1 to my variable and then add this variable to a list so when I print out my list, the value of the variable is within it. However, my code prints out an empty list despite me adding the variable to it.</p>
  
  <pre><code>case_number = 0
  case_numbers = []
  
  issue = input('Has the issue been solved?').lower()
  if issue == 'no':
        case_number += 1
        case_numbers+[int(case_number)]
        print(case_numbers)
  </code></pre>