old_contents: from importlib.metadata import version, PackageNotFoundError
  
  
  try:
      __version__ = version('plotnine')
  except PackageNotFoundError:
      # package is not installed
      pass
  
new_contents: from importlib.metadata import version, PackageNotFoundError
  
  
  try:
      __version__ = version('mizani')
  except PackageNotFoundError:
      # package is not installed
      pass
  
subject: Fix version number to check for mizani