<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_and_parse(self):
 """Load and parse archives in a list of projects. Returns a dict that maps unique ids onto ParsedNodes"""


        archives = []
        to_return = {}

        for name, project in self.all_projects.items():
            archives = archives + self.parse_archives_from_project(project)

        # We're going to have a similar issue with parsed nodes, if we want to
        # make parse_node return those.
        for a in archives:
            # archives have a config, but that would make for an invalid
            # UnparsedNode, so remove it and pass it along to parse_node as an
            # argument.
            archive_config = a.pop('config')
            archive = UnparsedNode(**a)
            node_path = self.get_path(archive.resource_type,
                                      archive.package_name,
                                      archive.name)

            to_return[node_path] = self.parse_node(
                archive,
                node_path,
                self.all_projects.get(archive.package_name),
                archive_config=archive_config)

        return to_return