def connect_input(self, spec_name, node, node_input, format=None, **kwargs):  # @ReservedAssignment @IgnorePep8
        """
        Connects a study fileset_spec as an input to the provided node

        Parameters
        ----------
        spec_name : str
            Name of the study data spec (or one of the IDs from the iterator
            nodes, 'subject_id' or 'visit_id') to connect to the node
        node : arcana.Node
            The node to connect the input to
        node_input : str
            Name of the input on the node to connect the fileset spec to
        format : FileFormat | None
            The file format the input is expected in. If it differs
            from the format in data spec or of study input then an implicit
            conversion is performed. If None the file format in the data spec
            is assumed
        """
        if spec_name in self.study.ITERFIELDS:
            self._iterator_conns[spec_name].append((node, node_input, format))
        else:
            name = self._map_name(spec_name, self._input_map)
            if name not in self.study.data_spec_names():
                raise ArcanaDesignError(
                    "Proposed input '{}' to {} is not a valid spec name ('{}')"
                    .format(name, self._error_msg_loc,
                            "', '".join(self.study.data_spec_names())))
            self._input_conns[name].append((node, node_input, format, kwargs))
Connects a study fileset_spec as an input to the provided node

        Parameters
        ----------
        spec_name : str
            Name of the study data spec (or one of the IDs from the iterator
            nodes, 'subject_id' or 'visit_id') to connect to the node
        node : arcana.Node
            The node to connect the input to
        node_input : str
            Name of the input on the node to connect the fileset spec to
        format : FileFormat | None
            The file format the input is expected in. If it differs
            from the format in data spec or of study input then an implicit
            conversion is performed. If None the file format in the data spec
            is assumed