old_contents: __version__ = "0.5.1"
  
  try:
      from .utils import gauge, metric
      # placate pyflakes
      assert gauge
      assert metric
  except ImportError:  # pragma: no cover
      pass  # pragma: no cover
  
new_contents: __version__ = "0.5.1"
  
  try:
      from .utils import gauge, metric  # NOQA
  except ImportError:  # pragma: no cover
      pass  # pragma: no cover
  
subject: use NOQA to since flake8