code: def main():
      try:
          name = sys.argv[1]
      except IndexError:
          raise ArgcompleteMarkerNotFound(
              "missing argument on the command line"
          )
  
      filename = find(name)
  
      try:
          fp = tokenize.open(filename)
      except OSError:
          raise ArgcompleteMarkerNotFound("cannot open file")
  
      with fp:
          head = fp.read(1024)
  
      if "PYTHON_ARGCOMPLETE_OK" not in head:
          raise ArgcompleteMarkerNotFound("marker not found")
  
imports: import os
  import sys
  import tokenize
label_desc: Use image node_id 2 for calling a global function with example usage: main() without return types