def __init__(self, default, ro=False, index=None, value=None,
name=None, doc=None, **kwargs):
"""Specify a Parameter with a default value and arbitrary
number of additional attributes.
Parameters
----------
name : str
Name of the parameter under which it should be available in its
respective collection.
doc : str
Documentation about the purpose of this parameter.
index : int or None
Index of parameter among the others. Determines order of listing
in help. If None, order of instantiation determines the index.
ro : bool
Either value which will be assigned in the constructor is read-only and
cannot be changed
value
Actual value of the parameter to be assigned
"""
# XXX probably is too generic...
# and potentially dangerous...
# let's at least keep track of what is passed
self._additional_props = []
for k, v in kwargs.iteritems():
self.__setattr__(k, v)
self._additional_props.append(k)
self.__default = default
self._ro = ro
# needs to come after kwargs processing, since some debug statements
# rely on working repr()
# value is not passed since we need to invoke _set with init=True
# below
IndexedCollectable.__init__(self, index=index, # value=value,
name=name, doc=doc)
self._isset = False
if value is None:
self._set(self.__default, init=True)
else:
self._set(value, init=True)
if __debug__:
if kwargs.has_key('val'):
raise ValueError, "'val' property name is illegal."
