class_docstr: Class to temporarily catch sys.displayhook
code: def __enter__(self):
      self.old_hook = sys.displayhook
      sys.displayhook = self
      return self
  
file_path: altair/altair/utils/execeval.py
imports: import ast
  import sys
label_desc: Use image node_id 2 for calling the _CatchDisplay obj's underlying member method code with example usage: obj.__enter__() and returns: self