code: def convert_to_label_chars(s):
    
  
    # We want the results to be user-friendly, not just functional.
    # So we can't base-64 encode it.
    #   * If upper-case: lower-case it
    #   * If the char is not a standard letter or digit. make it a dash
  
    # March 2019 note: underscores are now allowed in labels.
    # However, removing the conversion of underscores to dashes here would
    # create inconsistencies between old jobs and new jobs.
    # With existing code, $USER "jane_doe" has a user-id label of "jane-doe".
    # If we remove the conversion, the user-id label for new jobs is "jane_doe".
    # This makes looking up old jobs more complicated.
  
    accepted_characters = string.ascii_lowercase + string.digits + '-'
  
    def label_char_transform(char):
      if char in accepted_characters:
        return char
      if char in string.ascii_uppercase:
        return char.lower()
      return '-'
  
    return ''.join(label_char_transform(c) for c in s)
docs: Turn the specified name and value into a valid Google label.