docs: def discover_yaml(bank=None, **meta):
      """Discovers the YAML format and registers it if available.
  
      Install YAML support via PIP::
  
          pip install PyYAML
  
      :param bank: The format bank to register the format in
      :param meta: Extra information associated with the format
      """
      try:
          import yaml
          if bank is None:
              bank = default_bank
          bank.register('yaml', yaml.load, yaml.dump, **meta)
      except ImportError:
          pass