title: input() is always producing "None"
body: <p>Whenever I run the grading program I created,  it works fine but the text "None" keeps showing up and I don't know why. Here's the code:</p>
  
  <pre><code>Grade_in=input(print("Enter Your Grade (Only Upper Case):"))
  if (Grade_in=='A+') :
      print ("Numeric Grade is 4")
  elif (Grade_in=='A'):
      print("Numeric Grade is 4")
  elif (Grade_in=='A-'):
      print("Numeric Grade is 4.3")
  elif (Grade_in=='B+'):
      print ("Numeric Grade is 3.3")
  elif (Grade_in=='B'):
      print ("Numeric Grade is 3")
  elif (Grade_in=='B-'):
      print ("Numeric Grade is 2.7")
  elif (Grade_in=='C+'):
      print ("Numeric Grade is 2.3")
  elif (Grade_in=='C'):
      print ("Numeric Grade is 2")
  elif (Grade_in=='C-'):
      print ("Numeric Grade is 1.7")
  elif (Grade_in=='D+'):
      print ("Numeric Grade is 1.3")
  elif (Grade_in=='D'):
      print ("Numeric Grade is 1")
  elif (Grade_in=='D-'):
      print ("Numeric Grade is 0.7")
  elif (Grade_in=='F') :
      print ("Numeric Grade is 0")
  else :
      print ("Invalid Grade..!")
  
  OUTPUT :
  Enter Your Grade (Only Upper Case):
  NoneB-
  Numeric Grade is 2.7
  </code></pre>