code: def demo():
      # Each demo demonstrates different TextGrid formats.
      print("Format 1")
      demo_TextGrid(demo_data1)
      print("\nFormat 2")
      demo_TextGrid(demo_data2)
      print("\nFormat 3")
      demo_TextGrid(demo_data3)
  
imports: import sys
  import re
label_desc: Use image node_id 2 for calling a global function with example usage: demo() without return types