Python function composition

Question

I\'ve tried to implement function composition with nice syntax and here is what I\'ve got:

from functools import partial

class _compfunc(partial):
    def __lsh         


        

Answer 1

append does in-place addition, as Ignacio Vazquez-Abrams said (well, implied) -- so, while you could fix that by just adding a return to your function, it would have the side-effect of changing the argument it was passed, too:

@composable
def f4(a):
    a.append(0)
    return a

It would be best to use the following even more concise code which also creates and returns a new object:

@composable
def f4(a):
  return a + [0]