def update(self, module_name=None):
if not module_name:<EOL><INDENT>return self._module.force_update()<EOL><DEDENT>else:<EOL><INDENT>module_info = self._get_module_info(module_name)<EOL>if module_info:<EOL><INDENT>module_info["<STR_LIT>"].force_update()<EOL><DEDENT><DEDENT>
Update a module.  If module_name is supplied the module of that
name is updated.  Otherwise the module calling is updated.