Applying a function to itself

• A lambda function for self-application:
• >>> lambda f: f(f)
• Self-apply a function that takes anything, and returns 47
• >>> (lambda f: f(f)) ( lambda n: 47)
• 47
• >>> identity_fn = lambda x:x
• >>> f = (lambda f: f(f)) ( identity_fn )
• f is itself, the identity function..