class Tracer(object):
    def __init__(self, obj):
        self._obj = obj

    def __getattr__(self, attr):
        if attr == '_obj':
            return super().__getattr__(attr)

        orig = getattr(self._obj, attr)
        if callable(orig):
            def wrapped(*args, **kwargs):
                print("Calling {}.{} with {}, {}".format(
                    repr(self._obj), attr, repr(args), repr(kwargs)))
                return orig(*args, **kwargs)
            return wrapped
        else:
            print("Getting {}.{} = {}".format(repr(self._obj), attr, repr(orig)))
            return orig

    def __setattr__(self, attr, value):
        if attr == '_obj':
            super().__setattr__(attr, value)
            return

        print("Setting {}.{} to {}".format(repr(self._obj), attr, repr(value)))
        setattr(self._obj, attr, value)