def command(self, function=None, prefix=None, unobserved=False):
        """
        Decorator to define a new command for this Ingredient or Experiment.

        The name of the command will be the name of the function. It can be
        called from the command-line or by using the run_command function.

        Commands are automatically also captured functions.

        The command can be given a prefix, to restrict its configuration space
        to a subtree. (see ``capture`` for more information)

        A command can be made unobserved (i.e. ignoring all observers) by
        passing the unobserved=True keyword argument.
        """
        captured_f = self.capture(function, prefix=prefix)
        captured_f.unobserved = unobserved
        self.commands[function.__name__] = captured_f
        return captured_f

        Decorator to define a new command for this Ingredient or Experiment.

        The name of the command will be the name of the function. It can be
        called from the command-line or by using the run_command function.

        Commands are automatically also captured functions.

        The command can be given a prefix, to restrict its configuration space
        to a subtree. (see ``capture`` for more information)

        A command can be made unobserved (i.e. ignoring all observers) by
        passing the unobserved=True keyword argument.
        
sacred/ingredient.py