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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 _decode_linode_plan_label(label):
    '''
    Attempts to decode a user-supplied Linode plan label
    into the format in Linode API output

    label
        The label, or name, of the plan to decode.

    Example:
        `Linode 2048` will decode to `Linode 2GB`
    '''
    sizes = avail_sizes()

    if label not in sizes:
        if 'GB' in label:
            raise SaltCloudException(
                'Invalid Linode plan ({}) specified - call avail_sizes() for all available options'.format(label)
            )
        else:
            plan = label.split()

            if len(plan) != 2:
                raise SaltCloudException(
                    'Invalid Linode plan ({}) specified - call avail_sizes() for all available options'.format(label)
                )

            plan_type = plan[0]
            try:
                plan_size = int(plan[1])
            except TypeError:
                plan_size = 0
                log.debug('Failed to decode Linode plan label in Cloud Profile: %s', label)

            if plan_type == 'Linode' and plan_size == 1024:
                plan_type = 'Nanode'

            plan_size = plan_size/1024
            new_label = "{} {}GB".format(plan_type, plan_size)

            if new_label not in sizes:
                raise SaltCloudException(
                    'Invalid Linode plan ({}) specified - call avail_sizes() for all available options'.format(new_label)
                )

            log.warning(
                'An outdated Linode plan label was detected in your Cloud '
                'Profile (%s). Please update the profile to use the new '
                'label format (%s) for the requested Linode plan size.',
                label, new_label
            )

            label = new_label

    return sizes[label]['PLANID']