old_contents: #!/usr/local/bin/env python
  
  """
  YANK
  
  """
  
  # Define global version.
  from . import version  # Needed for yank 3.X.
  
  # Self module imports
  from . import utils
  from . import restraints
  from . import pipeline
  from . import experiment
  from .yank import Topography, AlchemicalPhase
  
  __version__ = version.version
  
new_contents: #!/usr/local/bin/env python
  
  """
  YANK
  
  """
  
  # Define global version.
  try:
      from . import version  # Needed for yank 3.X.
      __version__ = version.version
  except ImportError:
      __version__ = "0.0.0dev"
  
  # Self module imports
  from . import utils
  from . import restraints
  from . import pipeline
  from . import experiment
  from .yank import Topography, AlchemicalPhase
  
subject: Patch version checking