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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def show(uuid):
    '''
    Show manifest of a given image

    uuid : string
        uuid of image

    CLI Example:

    .. code-block:: bash

        salt '*' imgadm.show e42f8c84-bbea-11e2-b920-078fab2aab1f
        salt '*' imgadm.show plexinc/pms-docker:plexpass
    '''
    ret = {}

    if _is_uuid(uuid) or _is_docker_uuid(uuid):
        cmd = 'imgadm show {0}'.format(uuid)
        res = __salt__['cmd.run_all'](cmd, python_shell=False)
        retcode = res['retcode']
        if retcode != 0:
            ret['Error'] = _exit_status(retcode, res['stderr'])
        else:
            ret = salt.utils.json.loads(res['stdout'])
    else:
        ret['Error'] = "{} is not a valid uuid.".format(uuid)

    return ret