[myhdl-list] myhdl.SimulationError: Inappriopriate argument type: <type 'NoneType'>

[Shakthi K. <sha...@gm...>]

Hi,

I am trying the HelloWorld example from the manual on Python 2.7 with
python-myhdl (0.7) on Fedora 14.

=== hello1.py ===

#!/usr/bin/python

from myhdl import Signal, delay, always, now, Simulation

def HelloWorld():
    interval = delay(10)

    @always(interval)
    def sayHello():
        print "%s Hello World!" % now()

        return sayHello

inst = HelloWorld()
sim = Simulation(inst)
sim.run(30)

=== END ===

I get the following error in the output when running, python hello1.py:

=== OUTPUT ===

$  python hello1.py
Traceback (most recent call last):
  File "hello1.py", line 15, in <module>
    sim = Simulation(inst)
  File "/usr/lib/python2.7/site-packages/myhdl/_Simulation.py", line
64, in __init__
    self._waiters, self._cosim = _makeWaiters(arglist)
  File "/usr/lib/python2.7/site-packages/myhdl/_Simulation.py", line
222, in _makeWaiters
    raise SimulationError(_error.ArgType, str(type(arg)))
myhdl.SimulationError: Inappriopriate argument type: <type 'NoneType'>

=== END ===

What could be the problem?

SK

-- 
Shakthi Kannan
http://www.shakthimaan.com