make_constants.py

def make_constants(mapping):
   """Create a namedtuple of constants

   These are a poor man's enum.

   Example:
      c = make_constants({"ONE":1, "TWO":2, "THREE":3})
      c.ONE == 1
   
   :param mapping: A mapping with names as keys and values as values.
      The names must be valid python identifier strings.
   :returns: A namedtuple with the values given in mapping
   :rtype: namedtuple
   """
   nt = namedtuple("_Constants", mapping.viewkeys())
   return nt(**mapping)

STATUS = make_constants(
   OrderedDict([
      ("idle", 0),
      ("start", 1),
      ("success", 2),
      ("fail", 3),
      ("continuous", 4),
      ("stop", 5),
   ]))