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# Metaclass for mixing slots and descriptors
# From "Programming in Python 3" by Mark Summerfield Ch.8 p. 383
class AutoSlotProperties(type):
def __new__(mcl, classname, bases, dictionary):
slots = list(dictionary.get("__slots__", []))
for getter_name in [key for key in dictionary if key.startswith("get_")]:
name = getter_name
slots.append("__" + name)
getter = dictionary.pop(getter_name)
setter = dictionary.get(setter_name, None)
if (setter is not None
and isinstance(setter, collections.Callable)):
del dictionary[setter_name]
dictionary[name] = property(getter. setter)
dictionary["__slots__"] = tuple(slots)
return super().__new__(mcl, classname, bases, dictionary)
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