code: def readable_time_string():
      """Get a human-readable time string for the present."""
      return datetime.now().strftime("%Y-%m-%dT%H:%M:%S")
  
imports: import contextlib
  from datetime import datetime
  import sys
  import time
label_desc: Use image node_id 1 for calling a global function with example usage: readable_time_string() and returns: datetime