code: def set_generated_target_suffix (type, properties, suffix):
      
      assert isinstance(type, basestring)
      assert is_iterable_typed(properties, basestring)
      assert isinstance(suffix, basestring)
      set_generated_target_ps(1, type, properties, suffix)
docs: Sets a target suffix that should be used when generating target
          of 'type' with the specified properties. Can be called with
          empty properties if no suffix for 'type' was specified yet.
          This does not automatically specify that files 'suffix' have
          'type' --- two different types can use the same suffix for
          generating, but only one type should be auto-detected for
          a file with that suffix. User should explicitly specify which
          one.
  
          The 'suffix' parameter can be empty string ("") to indicate that
          no suffix should be used.