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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 assemble(name,
             devices,
             test_mode=False,
             **kwargs):
    '''
    Assemble a RAID device.

    CLI Examples:

    .. code-block:: bash

        salt '*' raid.assemble /dev/md0 ['/dev/xvdd', '/dev/xvde']

    .. note::

        Adding ``test_mode=True`` as an argument will print out the mdadm
        command that would have been run.

    name
        The name of the array to assemble.

    devices
        The list of devices comprising the array to assemble.

    kwargs
        Optional arguments to be passed to mdadm.

    returns
        test_mode=True:
            Prints out the full command.
        test_mode=False (Default):
            Executes command on the host(s) and prints out the mdadm output.

    For more info, read the ``mdadm`` manpage.
    '''
    opts = []
    for key in kwargs:
        if not key.startswith('__'):
            opts.append('--{0}'.format(key))
            if kwargs[key] is not True:
                opts.append(kwargs[key])

    # Devices may have been written with a blob:
    if isinstance(devices, six.string_types):
        devices = devices.split(',')

    cmd = ['mdadm', '-A', name, '-v'] + opts + devices

    if test_mode is True:
        return cmd
    elif test_mode is False:
        return __salt__['cmd.run'](cmd, python_shell=False)