filetools.py 文件源码

def load(self):
        """Load nodes and elements from all network files and return them in
        a :class:`~hydpy.selectiontools.Selections` instance.  Each single
        network file defines a seperate
        :class:`~hydpy.selectiontools.Selection` instance.  Additionally, all
        elements and nodes are bundled in a selection named `complete`.
        """
        selections = selectiontools.Selections()
        for (filename, path) in zip(self.filenames, self.filepaths):
            # Ensure both `Node` and `Element`start with a `fresh` memory.
            devicetools.Node.gather_new_nodes()
            devicetools.Element.gather_new_elements()
            try:
                info = runpy.run_path(path)
            except Exception:
                prefix = 'While trying to load the network file `%s`' % path
                objecttools.augmentexcmessage(prefix)
            try:
                selections += selectiontools.Selection(
                                    filename.split('.')[0],
                                    info['Node'].gather_new_nodes(),
                                    info['Element'].gather_new_elements())

            except KeyError as exc:
                KeyError('The class `%s` cannot be loaded from the network '
                         'file `%s`.  Please refer to the HydPy documentation '
                         'on how to prepare network files properly.'
                         % (exc.args[0], filename))
        selections += selectiontools.Selection(
                                    'complete',
                                    info['Node'].registered_nodes(),
                                    info['Element'].registered_elements())
        return selections