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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 create(vm_=None, call=None):
    '''
    Create a single GCE instance from a data dict.
    '''
    if call:
        raise SaltCloudSystemExit(
            'You cannot create an instance with -a or -f.'
        )

    node_info = request_instance(vm_)
    if isinstance(node_info, bool):
        raise SaltCloudSystemExit(
            'There was an error creating the GCE instance.'
        )
    node_dict = node_info[0]
    node_data = node_info[1]

    ssh_user, ssh_key = __get_ssh_credentials(vm_)
    vm_['ssh_host'] = __get_host(node_data, vm_)
    vm_['key_filename'] = ssh_key

    ret = __utils__['cloud.bootstrap'](vm_, __opts__)

    ret.update(node_dict)

    log.info('Created Cloud VM \'%s\'', vm_['name'])
    log.trace(
        '\'%s\' VM creation details:\n%s',
        vm_['name'], pprint.pformat(node_dict)
    )

    __utils__['cloud.fire_event'](
        'event',
        'created instance',
        'salt/cloud/{0}/created'.format(vm_['name']),
        args=__utils__['cloud.filter_event']('created', vm_, ['name', 'profile', 'provider', 'driver']),
        sock_dir=__opts__['sock_dir'],
        transport=__opts__['transport']
    )

    return ret