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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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