code: def _get_resource_type_cls(self, name, resource):
          
          # If provided resource does not have `Type` field
          if 'Type' not in resource:
              raise ResourceTypeNotDefined(name)
  
          # Attempt to find troposphere resource with:
          #   `resource_type` == resource['Type']
          try:
              return self.inspect_resources[resource['Type']]
          except KeyError:
              # is there a custom mapping?
              for custom_member in self._custom_members:
                  if custom_member.resource_type == resource['Type']:
                      return custom_member
              # If no resource with `resource_type` == resource['Type'] found
              return None
docs: Attempts to return troposphere class that represents Type of
          provided resource. Attempts to find the troposphere class who's
          `resource_type` field is the same as the provided resources `Type`
          field.
  
          :param resource: Resource to find troposphere class for
          :return: None: If no class found for provided resource
                   type: Type of provided resource
          :raise ResourceTypeNotDefined:
                    Provided resource does not have a `Type` field