class_docstr: Widget for displaying differences between hierarchical python data structures
  (eg, nested dicts, lists, and arrays)
code: def setColor(self, path, column, color, tree=None):
      brush = fn.mkBrush(color)
  
      # Color only one tree if specified.
      if tree is None:
          trees = self.trees
      else:
          trees = [self.trees[tree]]
  
      for tree in trees:
          item = tree.nodes[path]
          item.setBackground(column, brush)
  
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 5 for calling the DiffTreeWidget obj's underlying member method code with example usage: obj.setColor(path, column, color, tree) without return types