code: def execute():
      if len(sys.argv) == 1:
          executable_help()
      elif len(sys.argv) > 1:
          if sys.argv[1] == "-h" or sys.argv[1] == "--help":
              executable_help()
          else:
              command = sys.argv[1]
  
              if command not in valid_commands:
                  raise Exception(
                      "'%s' is not a valid Serpent command." % command
                  )
  
              command_function_mapping[command](*sys.argv[2:])
  
imports: import os
  import sys
  import shutil
  import subprocess
  import shlex
  import time
  import offshoot
  from serpent.utilities import clear_terminal, display_serpent_logo, is_linux, is_windows, wait_for_crossbar
  from serpent.window_controller import WindowController
label_desc: Use image node_id 1 for calling a global function with example usage: execute() without return types