old_contents: from .pwlf import PiecewiseLinFit  # noqa F401
  try:
      import tensorflow as tf  # noqa F401
      if tf.__version__ < '2.0.0':
          from .pwlftf import PiecewiseLinFitTF  # noqa F401
  except ImportError:
      pass
  import pwlf.version
  __version__ = pwlf.version.__version__
  
new_contents: from .pwlf import PiecewiseLinFit  # noqa F401
  try:
      import tensorflow as tf  # noqa F401
      if tf.__version__ < '2.0.0':
          from .pwlftf import PiecewiseLinFitTF  # noqa F401
  except ImportError:
      pass
  from .version import __version__  # noqa F401
  
subject: fix version handling for py2.7