Re: [Python-ideas] 'Injecting' objects as function-local constants

June 13, 2011

      On Mon, Jun 13, 2011 at 8:30 AM, Greg Ewing <greg.ewing@canterbury.ac.nz> wrote:
...
I'm -1 on any proposal that somehow tries to make the
default-argument hack more acceptable.
The main reason people still feel the need to use it
is that the for-loop is broken, insofar as it doesn't
create a new binding for each iteration.
The right way to address that is to fix the for-loop,
IMO.
Yikes, now *there's* a radical proposal.

-lots on any idea that would make:

def f():
  i = 0
  def g1():
    return i
  i = 1
  def g2():
    return i
  return [g1, g2]

differ in external behaviour from:

def f():
  result = []
  for i in range(2):
    def g():
      return i
    result.append(g)
  return result

or:

def f():
  return [lambda: i for i in range(2)]

or:

def _inner():
  for i in range(2):
    def g():
      return i
    yield g

def f():
  return list(_inner())

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan@gmail.com   |   Brisbane, Australia