doubt with importing module, given module name

[Pradnyesh Sawant]

Hello,
I have a string which in reality is the name of a module to be
imported. The name of the class contained in the module also has the
same (although with different capitalization). My requirement is to
import the module, and also create an instance of the class. eg:

str = "module"             #name of module is "module.py"
cls = str.capitalize()      #name of class is "Module"
inst = cls()                   #create an instance of class "Module"

how do i do this?

Thanks a lot in advance