def detach_classic_link_vpc(DryRun=None, InstanceId=None, VpcId=None):
    """
    Unlinks (detaches) a linked EC2-Classic instance from a VPC. After the instance has been unlinked, the VPC security groups are no longer associated with it. An instance is automatically unlinked from a VPC when it's stopped.
    See also: AWS API Documentation
    
    
    :example: response = client.detach_classic_link_vpc(
        DryRun=True|False,
        InstanceId='string',
        VpcId='string'
    )
    
    
    :type DryRun: boolean
    :param DryRun: Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation . Otherwise, it is UnauthorizedOperation .

    :type InstanceId: string
    :param InstanceId: [REQUIRED]
            The ID of the instance to unlink from the VPC.
            

    :type VpcId: string
    :param VpcId: [REQUIRED]
            The ID of the VPC to which the instance is linked.
            

    :rtype: dict
    :return: {
        'Return': True|False
    }
    
    
    """
    pass
