def __init__(self, request_validator=None, refresh_token=True):
        """
        If the refresh_token keyword argument is False, do not return
        a refresh token in the response.
        """
        self.request_validator = request_validator and RequestValidator()
        self.refresh_token = refresh_token
dataset/ETHPy150Open idan/oauthlib/oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py/ResourceOwnerPasswordCredentialsGrant.__init__/operator `or` -> `and`