def get_object_env_key(account, container, obj):
    """
    Get the keys for env (env_key) where info about object is cached
    :param   account: The name of the account
    :param container: The name of the container
    :param obj: The name of the object
    :returns a string env_key
    """
    env_key = 'swift.object/%s/%s/%s' % (account,
                                         container, obj)
    return env_key