docstr: Returns elapsed time at update.
docstr_tok: ["Returns","elapsed","time","at","update","."]
code: def _elapsed(self):
      """Returns elapsed time at update."""
      self.last_time = time.time()
      return self.last_time - self.start
  
imports: import os
  import sys
  import time
  from io import UnsupportedOperation
label_desc: Use image node_id 5 for calling the Prog obj's underlying member method code with example usage: obj._elapsed() and returns: unknown