title: Python function does not run
body: <p>So I created a function called calculator, which takes the celsius parameter.</p>
  
  <p>I tried using raw_input instead of input, but it didnt work.I also tried replacing return with print, but no result.</p>
  
  <pre><code>def calculator(celsius):
      celsius = float(input())
      fahrenheit = celsius * 9 / 5 + 32
      print(fahrenheit)
  calculator()
  </code></pre>
  
  <p>It should take the user's input in Celsius degrees, and then conver it into fahrenheit degrees and print them.</p>