title: Math operations from string
body: <p>Let's say I have a standard Python string (such as one obtained from <code>raw_input()</code>), maybe <code>"2 + 2"</code> for simplicity's sake. </p>
  
  <p>I'd like to convert this string to standard math operations in Python, such that <code>"2 + 2"</code> would return <code>4</code>. </p>
  
  <p>Is there an easy way to do this, or would I have to split on the spaces and parse each number/symbol manually, then do the math based on what I find? </p>
  
  <p>Do I want Regex?</p>