title: Mixing colors program
body: <p>Prompt:</p>
  
  <p>The colors red, blue, and yellow are known as the primary colors because they
  cannot be made by mixing other colors. When you mix two primary colors, you get
  a secondary color:
  When you mix red and blue, you get purple.
  When you mix red and yellow, you get orange.
  When you mix blue and yellow, you get green.</p>
  
  <p>Design a program that prompts the user to enter the names of two primary colors,
  one at a time. If the user enters anything other than "red," "blue," or
  "yellow," the program should print "You didn't input two primary colors."
  Otherwise, it should print something in the format:</p>
  
  <p>"When you mix red and blue, you get purple."
  (Assuming the user entered "red" and "blue”.) </p>
  
  <p>My program kept getting wrong standard output</p>
  
  <p>Here's what I wrote:</p>
  
  <pre><code>primary_colora = input("Enter primary color:")
  primary_colorb = input("Enter primary color:")
  primary_colors = primary_colora or primary_colorb
  
  if primary_colora == (red, blue, yellow):
      primary_colora = True
  
  elif primary_colorb == (red, blue, yellow):
      primary_colorb = True
  
  elif primary_colors == red or blue:
      print("When you mix red and blue, you get purple")
  
  elif primary_colors == yellow or blue:
      print("When you mix yellow and blue, you get green")
  
  elif primary_colors == yellow or red:
      print("When you mix yellow and red, you get orange")
  
  else: print("You didn't input two primary colors.")
  </code></pre>