def myErrorHandler(error):
	print error

def myMessageHandler(message):
	print message

def myProgressHandler(message, progress):
	print message + progress

def myCloseHandler(session, cursor):
	if cursor:
		cursor.close()
	else:
		session.close()

handlers = namedtuple('EventHandler', 'myErrorHandler, myMessageHandler, myProgressHandler, myCloseHandler')
conn = wiredtiger.wiredtiger_open("WT_HOME", handlers, "create")

from collections import namedtuple
from operator import itemgetter

import wiredtiger

# This will become part of wiredtiger.py
class EventHandler(tuple):
	'Event Handler function pointers.'
	__slots__ = ()

	_fields = ('errorHandler', 'messageHandler', 'progressHandler', 'closeHandler')

	def __new__(_cls, errorHandler, messageHandler, progressHandler, closeHandler):
		'Create a new instance of EventHandler'
		return _tuple.__new__(_cls, (errorHandler, messageHandler, progressHandler, closeHandler))

	@classmethod
	def _make(cls, iterable, new=tuple.__new__, len=len):
		'Make a new EventHandler object from a sequence or iterable'
		result = new(cls, iterable)
		if len(result) != 4:
			raise TypeError('Expected 4 arguments, got %d' % len(result))
		return result

	def _asdict(self):
		'Return a new OrderedDict which maps field names to their values'
		return OrderedDict(zip(self._fields, self))

	__dict__ = property(_asdict)

	def _replace(_self, **kwds):
		'Return a new EventHandler object replacing specified fields with new values'
		result = _self._make(map(kwds.pop, ('errorHandler', 'messageHandler', 'progressHandler', 'closeHandler'), _self))
		if kwds:
			raise ValueError('Got unexpected field names: %r' % kwds.keys())
		return result

	def __getnewargs__(self):
		'Return self as a plain tuple.	Used by copy and pickle.'
		return tuple(self)

	errorHandler = property(itemgetter(0), doc='Alias for field number 0')
	messageHandler = property(itemgetter(1), doc='Alias for field number 1')
	progressHandler = property(itemgetter(1), doc='Alias for field number 2')
	closeHandler = property(itemgetter(1), doc='Alias for field number 3')