code: def nearestVertex(self, point, epsilon):
      for i, p in enumerate(self.points):
          if distance(p - point) <= epsilon:
              return i
      return None
  
imports: import math
  import sys
  from PyQt5.QtCore import QPointF
  from PyQt5.QtGui import QColor, QPen, QPainterPath, QFont
  from libs.utils import distance
label_desc: Use image node_id 13 for calling the Shape obj's underlying member method code with example usage: obj.nearestVertex(point, epsilon) and returns: None, i