title: Having to evaluate a string to access a class from a module
body: <p>I've loaded one of my modules &lt;module my_modules.mymodule from .../my_modules/mymodule.pyc> with __import__.</p>
  
  <p>Now I'm having the module saved in a variable, but I'd like to create an instance of the class mymodule. Thing is - I've gotten the module name passed as string into my script. 
  So I've got a variable containing the module, and I've got the module name but as string.</p>
  
  <p>variable_containing_module.string_variable_with_correct_classname() doesn't work. Because it says there is no such thing in the module as "string_variable_with_correct_classname" - because it doesn't evaluate the string name. How can I do so?</p>