title: ValueError: could not convert string to float
body: <p>So... I have this primitive calculator that runs fine on my cellphone, but when I try to run it on Windows 10 I get...</p>
  
  <blockquote>
    <p>ValueError: could not convert string to float</p>
  </blockquote>
  
  <p>I don't know what the problem is, I've tried using <code>raw_input</code> but it doesn't work ether. Please keep in mind I'm green and am not aware of most methods for getting around a problem like this</p>
  
  <pre><code>num1 = float(input ()) #take a float and store it
  chars = input () #take a string          and store it
  num2 = float(input ())
  </code></pre>