How to use the placebo.attach function in placebo

def record_flight_data(self, test_case, zdata=False, augment=False):
        self.recording = True
        test_dir = os.path.join(self.placebo_dir, test_case)
        if not (zdata or augment):
            if os.path.exists(test_dir):
                shutil.rmtree(test_dir)
            os.makedirs(test_dir)

        session = boto3.Session()
        default_region = session.region_name
        if not zdata:
            pill = placebo.attach(session, test_dir)
        else:
            pill = attach(session, self.archive_path, test_case, debug=True)

        pill.record()
        self.pill = pill
        self.addCleanup(pill.stop)
        self.addCleanup(self.cleanUp)

        def factory(region=None, assume=None):
            if region and region != default_region:
                new_session = boto3.Session(region_name=region)
                assert not zdata
                new_pill = placebo.attach(new_session, test_dir, debug=True)
                new_pill.record()
                self.addCleanup(new_pill.stop)
                return new_session

'region_name': os.environ.get('AWS_DEFAULT_REGION', 'us-east-1')
        }
        profile_name = os.environ.get('PLACEBO_PROFILE', None)
        if profile_name:
            session_kwargs['profile_name'] = profile_name

        session = boto3.Session(**session_kwargs)

        self = args[0]
        prefix = self.__class__.__name__ + '.' + function.__name__
        record_dir = os.path.join(PLACEBO_DIR, prefix)

        if not os.path.exists(record_dir):
            os.makedirs(record_dir)

        pill = placebo.attach(session, data_path=record_dir)

        if os.environ.get('PLACEBO_MODE') == 'record':
            pill.record()
        else:
            pill.playback()

        kwargs['session'] = session

        return function(*args, **kwargs)

The `region` argument is to allow functional tests to override the
        default region. It is unused when replaying stored data.
        """

        if strtobool(os.environ.get('C7N_FUNCTIONAL', 'no')):
            self.recording = True
            return lambda region=region, assume=None: boto3.Session(region_name=region)

        if not zdata:
            test_dir = os.path.join(self.placebo_dir, test_case)
            if not os.path.exists(test_dir):
                raise RuntimeError("Invalid Test Dir for flight data %s" % test_dir)

        session = boto3.Session()
        if not zdata:
            pill = placebo.attach(session, test_dir)
            # pill = BluePill()
            # pill.attach(session, test_dir)
        else:
            pill = attach(session, self.archive_path, test_case, False)

        pill.playback()
        self.addCleanup(pill.stop)
        self.addCleanup(self.cleanUp)
        return lambda region=None, assume=None: session

def setUp(self):
        self.environ = {}
        self.environ_patch = mock.patch('os.environ', self.environ)
        self.environ_patch.start()
        credential_path = os.path.join(os.path.dirname(__file__), 'cfg',
                                       'aws_credentials')
        self.environ['AWS_SHARED_CREDENTIALS_FILE'] = credential_path
        self.data_path = os.path.join(os.path.dirname(__file__), 'responses')
        self.data_path = os.path.join(self.data_path, 'tests')
        self.session = boto3.Session(profile_name='foobar',
                                     region_name='us-west-2')
        self.pill = placebo.attach(self.session, self.data_path)

def setUp(self):
        self.environ = {}
        self.environ_patch = mock.patch('os.environ', self.environ)
        self.environ_patch.start()
        credential_path = os.path.join(os.path.dirname(__file__), 'cfg',
                                       'aws_credentials')
        self.environ['AWS_SHARED_CREDENTIALS_FILE'] = credential_path
        self.data_path = os.path.join(os.path.dirname(__file__), 'responses')
        self.data_path = os.path.join(self.data_path, 'saved')
        self.session = boto3.Session(profile_name='foobar',
                                     region_name='us-west-2')
        self.pill = placebo.attach(self.session, self.data_path)

def test_assumed_session(self):
        factory = self.replay_flight_data("test_credential_sts")
        session = assumed_session(
            role_arn='arn:aws:iam::644160558196:role/CustodianGuardDuty',
            session_name="custodian-dev",
            session=factory(),
        )

        # attach the placebo flight recorder to the new session.
        pill = placebo.attach(
            session, os.path.join(self.placebo_dir, 'test_credential_sts'))
        if self.recording:
            pill.record()
        else:
            pill.playback()
        self.addCleanup(pill.stop)

        try:
            identity = session.client("sts").get_caller_identity()
        except ClientError as e:
            self.assertEqual(e.response["Error"]["Code"], "ValidationError")

        self.assertEqual(
            identity['Arn'],
            'arn:aws:sts::644160558196:assumed-role/CustodianGuardDuty/custodian-dev')

profile_name = os.environ.get('PLACEBO_PROFILE', None)
        if profile_name:
            session_kwargs['profile_name'] = profile_name

        session = boto3.Session(**session_kwargs)

        self = args[0]
        prefix = self.__class__.__name__ + '.' + function.__name__
        base_dir = os.environ.get(
            "PLACEBO_DIR", os.path.join(os.getcwd(), "placebo"))
        record_dir = os.path.join(base_dir, prefix)

        if not os.path.exists(record_dir):
            os.makedirs(record_dir)

        pill = placebo.attach(session, data_path=record_dir)

        if os.environ.get('PLACEBO_MODE') == 'record':
            pill.record()
        else:
            pill.playback()

        kwargs['session'] = session

        return function(*args, **kwargs)