Defining new functions at runtime

[Chandan Shanbhag]

    I am writing a GUI interface to a database using tkinter. Now, I want to
provide a facility where a user can define python functions using the GUI
and then run them in the same runtime environment. so, a normal function
needs to be treated like a method object.
   Is this possible? Can I treat functions as first class objects? Can
somebody please guide me as to how I could accomplish this?

Thanks
Chandan