'Returns AWS resource descriptions for running and deleted
stacks. If `StackName` is specified, all the associated
resources that are part of the stack are returned. If
`PhysicalResourceId` is specified, the associated resources of
the stack that the resource belongs to are returned.
Only the first 100 resources will be returned. If your stack
has more resources than this, you should use
`ListStackResources` instead.
For deleted stacks, `DescribeStackResources` returns resource
information for up to 90 days after the stack has been
deleted.
You must specify either `StackName` or `PhysicalResourceId`,
but not both. In addition, you can specify `LogicalResourceId`
to filter the returned result. For more information about
resources, the `LogicalResourceId` and `PhysicalResourceId`,
go to the `AWS CloudFormation User Guide`_.
A `ValidationError` is returned if you specify both
`StackName` and `PhysicalResourceId` in the same request.
:type stack_name_or_id: string
:param stack_name_or_id: The name or the unique identifier associated
with the stack.
Required: Conditional. If you do not specify `StackName`, you must
specify `PhysicalResourceId`.
Default: There is no default value.
:type logical_resource_id: string
:param logical_resource_id: The logical name of the resource as
specified in the template.
Default: There is no default value.
:type physical_resource_id: string
:param physical_resource_id: The name or unique identifier that
corresponds to a physical instance ID of a resource supported by
AWS CloudFormation.
For example, for an Amazon Elastic Compute Cloud (EC2) instance,
`PhysicalResourceId` corresponds to the `InstanceId`. You can pass
the EC2 `InstanceId` to `DescribeStackResources` to find which
stack the instance belongs to and what other resources are part of
the stack.
Required: Conditional. If you do not specify `PhysicalResourceId`, you
must specify `StackName`.
Default: There is no default value.'

def describe_stack_resources(self, stack_name_or_id=None, logical_resource_id=None, physical_resource_id=None):

    params = {}
    if stack_name_or_id:
        params['StackName'] = stack_name_or_id
    if logical_resource_id:
        params['LogicalResourceId'] = logical_resource_id
    if physical_resource_id:
        params['PhysicalResourceId'] = physical_resource_id
    return self.get_list('DescribeStackResources', params, [('member', StackResource)])
