title: How to increment variable numeric value.
body: <p>Okay, so i'm trying to keep track of how many questions the player got right, but when I say 'score = +1' it adds nothing to the score. How do I do this? Here is my code:</p>
  
  <pre><code>    score = 0
  
  print('This is a 10 question quiz. Please do not use any capitol letters when answeringquestions'
  )
  
  print('1. Can elephants jump? (yes or no)')
  answer_1 = input()
  if answer_1 == 'yes':
      print('Wrong! Elephants cannot jump.')
  if answer_1 == 'no':
      print('Correct! Elephants cannot jump!')
      score = +1
  
  print('(true or false) Karoake means \"Empty Orchestra\" In Japanese')
  answer_2 = input()
  if answer_2 == 'true':
      print('Correct! Karoake does in fact mean \"Empty orchestra\" in Japanese')
      score = +1
  if answer_2 == 'false':
      print('Wrong! Karoake does in fact mean \"Empty orchestra\" in Japanese')
  
  
  print('Solve the math problem: What is the square root of 64?')
  answer_3 = input()
  if answer_3 == 8:
      print('Good job! The square root of 64 is 8!')
      score = +1
  else:
      print('Incorrect! the square root of 64 is 8.')
  
  print(score)
  </code></pre>