docstr: Initialize the angle if appropriate
docstr_tok: ["Initialize","the","angle","if","appropriate"]
code: def prepare_group(self, workspace, grouping, image_numbers):
      """Initialize the angle if appropriate"""
      if (
          self.rotate_choice == ROTATE_MOUSE
          and self.how_often == IO_ONCE
      ):
          self.get_dictionary(workspace.image_set_list)[D_ANGLE] = None
  
imports: import numpy
  import scipy.ndimage
  from cellprofiler_core.constants.measurement import IMAGE, COLTYPE_FLOAT
  from cellprofiler_core.image import Image
  from cellprofiler_core.module import Module
  from cellprofiler_core.setting import Binary
  from cellprofiler_core.setting import Coordinates
  from cellprofiler_core.setting.choice import Choice
  from cellprofiler_core.setting.subscriber import ImageSubscriber
  from cellprofiler_core.setting.text import ImageName, Float
label_desc: Use image node_id 4 for calling the FlipAndRotate obj's underlying member method code with example usage: obj.prepare_group(workspace, grouping, image_numbers) without return types