nlist.py 文件源码

def __setattr__(self, name, new):
        fields = super().__getattribute__('_fields')
        if name in fields:
            try:
                old = super().__getattribute__(name)
            except AttributeError:
                old = undefined
            res = super().__setattr__(name, new)
            deps = super().__getattribute__('_deps')
            if name in deps:
                eq = super().__getattribute__('_field_eq')
                if old is undefined or not eq(old, new):
                    deps[name].changed()
        else:
            res = super().__setattr__(name, new)
        return res