class_docstr: Return the output of a string evaluated/executed by the python interpreter.
  The string may be either an expression or a python script, and inputs are accessed as the name of the terminal. 
  For expressions, a single value may be evaluated for a single output, or a dict for multiple outputs.
  For a script, the text will be executed as the body of a function.
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code: def ctrlWidget(self):
      return self.ui
  
imports: import numpy
  from ...graphicsItems.LinearRegionItem import LinearRegionItem
  from ...Qt import QtCore, QtWidgets
  from ...widgets.TreeWidget import TreeWidget
  from ..Node import Node
  from .None import functions
  from .common import CtrlNode
label_desc: Use image node_id 2 for calling the EvalNode obj's underlying member method code with example usage: obj.ctrlWidget() and returns: self