parameters: (self)
docstring: Run the parent roslaunch event loop once
docstring_summary: Run the parent roslaunch event loop once
docstring_tokens: Run the parent roslaunch event loop once
function: def spin_once(self):
          """
          Run the parent roslaunch event loop once
          """
          if self.runner:
              self.runner.spin_once()
function_tokens: def spin_once ( self ) : if self . runner : self . runner . spin_once ( )