title: Convert string to Python class object?
body: <p>Given a string as user input to a Python function, I'd like to get a class object out of it if there's a class with that name in the currently defined namespace. Essentially, I want the implementation for a function which will produce this kind of result:</p>
  
  <pre><code>class Foo:
      pass
  
  str_to_class("Foo")
  ==&gt; &lt;class __main__.Foo at 0x69ba0&gt;
  </code></pre>
  
  <p>Is this, at all, possible?</p>