[Edu-sig] composing functions (was Great Computer Shootout)

[Kirby Urner]

>Drawing a blank this AM re how to do this in Python, trying
>various things with little lambda.
>
>Clues?
>
>Kirby

If I write in a module, I can do it like this:

Module:  proto2.py
======
from __future__ import nested_scopes

def compose(f,g):
    return lambda x: f(g(x))

======

  >>> def f(x): return x*x

  >>> def g(x): return x+2

  >>> from proto2 import compose
  >>> h = compose(f,g)
  >>> h
  <function <lambda> at 0123593C>
  >>> h(10)
  144

However, I can't get a similar compose to work interactively be
entering the function in IDLE, even if I import nested_scopes.
This relates to an earlier post, where I was having difficulty
getting the nested feature to work in top-level IDLE.0.8.

Kirby