code: def addAnnotation(
      self,
      image_id: int,
      category_id: int,
      segmentation: list,
      area: float = None,
      id: int = None,
  ):
      if id is not None and self.anns.get(id, None) is not None:
          print("标签已经存在")
          return
      if not id:
          self.maxAnnId += 1
          id = self.maxAnnId
  
      ann = {
          "id": id,
          "iscrowd": 0,
          "image_id": image_id,
          "category_id": category_id,
          "segmentation": [segmentation],
          "area": self.getArea(segmentation),
          "bbox": self.getBB(segmentation),
      }
  
      self.dataset["annotations"].append(ann)
      self.anns[id] = ann
      self.imgToAnns[image_id].append(ann)
      self.catToImgs[category_id].append(image_id)
      return id
  
imports: import json
  import time
  import matplotlib.pyplot
  from matplotlib.collections import PatchCollection
  from matplotlib.patches import Polygon
  import numpy
  import copy
  import itertools
  import os
  import os.path
  from collections import defaultdict
  import sys
  from datetime import datetime
label_desc: Use image node_id 11 for calling the COCO obj's underlying member method code with example usage: obj.addAnnotation(image_id, category_id, segmentation, area, id) and returns: id