generators as fibers

fiber.py

# python 2.7.x
class Fiber:
    def __init__(self, callback):
        self._callback = callback()
    
    def resume(self):
        return self._callback.next()

usage.py

def work():
    yield 1
    yield 2

f = Fiber(work)
print f.resume()
print f.resume()

# PS1: almost same API as http://ruby-doc.org/core/Fiber.html
# PS2: http://www.python.org/dev/peps/pep-0342/