a.py

Foo = 1 
class Bar(object): 
  def baz(self): 
    print Foo

b.rb

a = IronRuby.require('a') # a is an instance of Scope 
a.foo += 1                # get and set Python module variable 
b = a.bar.new             # instantiate Python class
b.baz                     # call its instance method