Nice, short little book! `compose` can be simpler: def compose(fn, *fns): def _composer(f, g): return lambda *args: f(g(*args)) return reduce(_composer, fns, fn) This little function is really, really cool because it allows you to build up more interesting functions by piecing together a bunch of small, useful ones. def upper(s): return s.upper() def exclaim(s): return s + '!' # instead of this really_angry = lambda…
I started with something like that when I was missing function composition in Python. Eventually I ended up with a library [1] including a bunch of other stuff for getting rid of some of the duct tape code you usually need when you just want to compose some functions.
from pipetools import pipe, X, foreach
really_angry = pipe | upper | exclaim | exclaim
really_angry = X.upper() | "{0}!" | "{0}!"
(1, 2, 3, 4) > foreach((X + 1) | (X * 3)) | max