gistfile1.py

#!/usr/bin/env python

import functools

# Take a generator function (i.e. a callable which returns a generator) and
# return a callable which calls .send()
class coroutine:
  def __init__(self, function):
    self.function = function

    functools.update_wrapper(self, function)

  def __call__(self, *args, **kwds):
    try:
      return self.generator.send(args)

    except AttributeError:
      self.generator = self.function(*args, **kwds)

      return self.generator.next()

# Each time we're called, advance to next yield
@coroutine
def test():
  yield 'call me once'
  yield 'call me twice'

# Works like a charm : )
assert 'call me once' == test()
assert 'call me twice' == test()

class Test:

  # Each time we're called, advance to next yield
  @coroutine
  def test(self):
    yield 'call me once'
    yield 'call me twice'

test = Test()

# TypeError, WTF?
assert 'call me once' == test.test()
assert 'call me twice' == test.test()