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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 internet_gateway_present(name, vpc_name=None, vpc_id=None,
                             tags=None, region=None, key=None,
                             keyid=None, profile=None):
    '''
    Ensure an internet gateway exists.

    name
        Name of the internet gateway.

    vpc_name
        Name of the VPC to which the internet gateway should be attached.

    vpc_id
        Id of the VPC to which the internet_gateway should be attached.
        Only one of vpc_name or vpc_id may be provided.

    tags
        A list of tags.

    region
        Region to connect to.

    key
        Secret key to be used.

    keyid
        Access key to be used.

    profile
        A dict with region, key and keyid, or a pillar key (string) that
        contains a dict with region, key and keyid.
    '''

    ret = {'name': name,
           'result': True,
           'comment': '',
           'changes': {}
           }

    r = __salt__['boto_vpc.resource_exists']('internet_gateway', name=name,
                                             region=region, key=key,
                                             keyid=keyid, profile=profile)
    if 'error' in r:
        ret['result'] = False
        ret['comment'] = 'Failed to create internet gateway: {0}.'.format(r['error']['message'])
        return ret

    if not r.get('exists'):
        if __opts__['test']:
            ret['comment'] = 'Internet gateway {0} is set to be created.'.format(name)
            ret['result'] = None
            return ret
        r = __salt__['boto_vpc.create_internet_gateway'](internet_gateway_name=name,
                                                         vpc_name=vpc_name, vpc_id=vpc_id,
                                                         tags=tags, region=region,
                                                         key=key, keyid=keyid,
                                                         profile=profile)
        if not r.get('created'):
            ret['result'] = False
            ret['comment'] = 'Failed to create internet gateway: {0}'.format(r['error']['message'])
            return ret

        ret['changes']['old'] = {'internet_gateway': None}
        ret['changes']['new'] = {'internet_gateway': r['id']}
        ret['comment'] = 'Internet gateway {0} created.'.format(name)
        return ret
    ret['comment'] = 'Internet gateway {0} present.'.format(name)
    return ret