class_docstr: Extension of QVector3D which adds a few helpful methods.
code: def __len__(self):
      return 3
  
file_path: pyqtgraph/pyqtgraph/Vector.py
imports: from math import acos, degrees
  from .None import functions
  from .Qt import QT_LIB, QtCore, QtGui
label_desc: Use image node_id 2 for calling the Vector obj's underlying member method code with example usage: obj.__len__() and returns: int