fragment of core.py

core.py

class Type:
    def __new__(cls, raw, context):
        ''' Deeply magic wrapper that constructs a Type from a C Type*.

            It will always return the same object as long as it exists,
            which will actually be an instance of a subclass.
        '''
        assert isinstance(raw, _core.Type)
        assert isinstance(context, Context)
        assert cls == Type # subclasses must override it
        if not raw:
            return None
        raw_ptr = _c.pointer_value(raw)
        try:
            return context.type_cache[raw_ptr]
        except KeyError:
            pass
        kind = _core.GetTypeKind(raw)
        self = object.__new__(Type.kind_type_map[kind])
        context.type_cache[raw_ptr] = self
        self._raw = raw
        self._context = context
        return self