class_docstr: Extension of QVector3D which adds a few helpful methods.
code: def __getitem__(self, i):
      if i == 0:
          return self.x()
      elif i == 1:
          return self.y()
      elif i == 2:
          return self.z()
      else:
          raise IndexError("Point has no index %s" % str(i))
  
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 3 for calling the Vector obj's underlying member method code with example usage: obj.__getitem__(i) and returns: self, self, self