class_docstr: Widget for displaying differences between hierarchical python data structures
  (eg, nested dicts, lists, and arrays)
code: def __init__(self, parent=None, a=None, b=None):
      QtWidgets.QWidget.__init__(self, parent)
      self.layout = QtWidgets.QHBoxLayout()
      self.setLayout(self.layout)
      self.trees = [DataTreeWidget(self), DataTreeWidget(self)]
      for t in self.trees:
          self.layout.addWidget(t)
      if a is not None:
          self.setData(a, b)
  
file_path: pyqtgraph/pyqtgraph/widgets/DiffTreeWidget.py
imports: import numpy
  from ..None import functions
  from ..Qt import QtWidgets
  from .DataTreeWidget import DataTreeWidget
label_desc: Use image node_id 1 to create a new DiffTreeWidget object from inherited base classes: QtWidgets with example: obj = DiffTreeWidget(parent, a, b)