def __init__(self, event_receiver=None, filename=None, **kwargs):
self.event_receiver = event_receiver
self.handle = -1
def __init__(self, event_receiver=None, filename=None, **kwargs):
self.event_receiver = event_receiver
self.handle = -1
if filename:
if not self._open_device(filename):
raise exceptions.RuntimeError, 'Unable to find powermate'
if filename:
if not self._open_device(filename):
raise exceptions.RuntimeError, 'Unable to find powermate'