stackless python constructor

import stackless
class MyTasklet(stackless.tasklet):
    def __init__(self, func, msg):
        pass

def foo():
    pass

msg = 'hello'
MyTasklet(foo, msg)()

I am using stackless python, this code generates the following error:

Traceback (most recent call last):
  File "E:/workspace/python/test/klass.py", line 11, in <module>
    MyTasklet(foo, msg)()
TypeError: tasklet() takes at most 1 argument (2 given)

It's very odd since I did not call the constructor of stackless.tasklet.

Anyone know what exactly the error is about.

Since the problem has to do with sub-classing stackless.tasklet, you could just make MyTasklet a callable object instead like follows:

import stackless
class MyTasklet(object):
    def __init__(self, func, msg):
        self.func = func
        self.msg = msg 

    def __call__(self):
      t = stackless.tasklet()
      t.bind(self.func)
      t.setup(self.msg)
      t.run()

def foo(msg):
  print msg 

msg = 'hello'
MyTasklet(foo, msg)()

EDIT: Alternatively you can just override __new__ to pass the correct arguments to stackless.tasklet.__new__:

import stackless
class MyTasklet(stackless.tasklet):
  def __new__(cls, func, msg):
    return stackless.tasklet.__new__(MyTasklet, func)
  def __init__(self, func, msg):
    pass

def foo():
  pass

msg = 'hello'
MyTasklet(foo, msg)()