Python: Reference to a class from a string?

Question

How to use a string containing a class name to reference a class itself?
See this (not working) exemple...

class WrapperClass:
    def display_var(self):         


        

Answer 1

There exists a case where one has the name of a class, but not a reference to it. A tkinter Entry widget has a validate method which returns to the callback function (%W parameter) the name of the widget, not a reference to it. If you have a window with an array of entry fields, It is inconvenient to use a different callback function for each entry. Converting the string name to the reference in the callback function is a more efficient way to associate the callback to the source of the validate event. I would have commented on Devin's answer, but don't have the reputation points to make comments yet.