code: def key_label(k: Optional[str]) -> str:
      """converts the argument into a valid label, suitable for submission as a label
      key to Cloud.
  
      """
      return _clean_label(k, True)
  
file_path: caliban/caliban/platform/cloud/util.py
imports: import re
  from typing import Dict, List, Optional, Tuple, Union
  import caliban.util
  import caliban.util.argparse
label_desc: Use image node_id 3 for calling a global function with example usage: key_label(k) and returns: _clean_label