parameters: (slice_sets, tag_spec)
return_statement: return (used_slice_sets, required_args)
docstring: Extract used-slice-sets and required CLI arguments from a spec string.
  
    For example, {FOO}{bar}{bat} finds FOO, bar, and bat. Assuming bar and bat
    are both named slice sets, FOO must be specified on the command line.
  
    Args:
       slice_sets: Dict of named slice sets
       tag_spec: The tag spec string, e.g. {_FOO}{blep}
  
    Returns:
       (used_slice_sets, required_args), a tuple of lists
docstring_summary: Extract used-slice-sets and required CLI arguments from a spec string.
docstring_tokens: Extract used - slice - sets and required CLI arguments from a spec string .
function: def get_slice_sets_and_required_args(slice_sets, tag_spec):
    """Extract used-slice-sets and required CLI arguments from a spec string.
  
    For example, {FOO}{bar}{bat} finds FOO, bar, and bat. Assuming bar and bat
    are both named slice sets, FOO must be specified on the command line.
  
    Args:
       slice_sets: Dict of named slice sets
       tag_spec: The tag spec string, e.g. {_FOO}{blep}
  
    Returns:
       (used_slice_sets, required_args), a tuple of lists
    """
    required_args = []
    used_slice_sets = []
  
    extract_bracketed_words = re.compile(r'\{([^}]+)\}')
    possible_args_or_slice_set_names = extract_bracketed_words.findall(tag_spec)
    for name in possible_args_or_slice_set_names:
      if name in slice_sets:
        used_slice_sets.append(name)
      else:
        required_args.append(name)
  
    return (used_slice_sets, required_args)
function_tokens: def get_slice_sets_and_required_args ( slice_sets , tag_spec ) : required_args = [ ] used_slice_sets = [ ] extract_bracketed_words = re . compile ( r'\{([^}]+)\}' ) possible_args_or_slice_set_names = extract_bracketed_words . findall ( tag_spec ) for name in possible_args_or_slice_set_names : if name in slice_sets : used_slice_sets . append ( name ) else : required_args . append ( name ) return ( used_slice_sets , required_args )