code: def eval(
      statement: str, frame=None
  ) -> (tsensor.ast.ParseTreeNode, object):
      """
      Parse statement and return an ast in the context of execution frame or, if None,
      the invoking function's frame. Set the value field of all ast nodes.
      Overall result is in root.value.
      :param statement: A string representing the line of Python code to visualize within an execution frame.
      :param frame: The execution frame in which to evaluate the statement. If None,
                    use the execution frame of the invoking function
      :return An abstract parse tree representing the statement; nodes are
              ParseTreeNode subclasses.
      """
      p = tsensor.parsing.PyExprParser(statement)
      root = p.parse()
      if frame is None:  # use frame of caller
          frame = sys._getframe().f_back
      root.eval(frame)
      return root, root.value
  
imports: import os
  import sys
  import traceback
  import inspect
  import hashlib
  from pathlib import Path
  import matplotlib.pyplot
  import tsensor
label_desc: Use image node_id 1 for calling a global function with example usage: eval(statement, frame) and returns: root,  root