def get_installed_pypackages():
    return {p.project_name.lower(): p for p in pkg_resources.working_set}
def _setup_drag(self, item):
    self._drag_and_drop_context.setup_drag(
      item.item_widget,
      self._get_drag_data,
      self._on_drag_data_received,
      [item],
      [item],
      self)