old_contents: import importlib
  from pygubu.i18n import _
  from pygubu.api.v1 import BuilderLoaderPlugin
  
  
  _designer_tab_label = _("tksheet")
  _plugin_uid = "tksheet"
  
  
  class StandardTKWidgetsLoader(BuilderLoaderPlugin):
      _module = "pygubu.plugins.tksheet.sheet"
  
      def do_activate(self) -> bool:
          spec = importlib.util.find_spec("tksheet")
          return True if spec is not None else False
  
      def get_module_for(self, identifier: str) -> str:
          return self._module
  
      def get_all_modules(self):
          return (self._module,)
  
      def can_load(self, identifier: str) -> bool:
          return identifier.startswith("tksheet.")
  
new_contents: import importlib
  from pygubu.i18n import _
  from pygubu.api.v1 import BuilderLoaderPlugin
  
  
  _designer_tab_label = _("tksheet")
  _plugin_uid = "tksheet"
  
  
  class TksheetLoader(BuilderLoaderPlugin):
      _module = "pygubu.plugins.tksheet.sheet"
  
      def do_activate(self) -> bool:
          spec = importlib.util.find_spec("tksheet")
          return True if spec is not None else False
  
      def get_module_for(self, identifier: str) -> str:
          return self._module
  
      def get_all_modules(self):
          return (self._module,)
  
      def can_load(self, identifier: str) -> bool:
          return identifier.startswith("tksheet.")
  
subject: Fix class name.