new_contents: from .compat import Path
  from os.path import expanduser, expandvars, isabs
  
  
  def resolve_from_str(input, root):
      assert not isinstance(input, Path), "would break on py2"
      root = Path(root)
      input = expanduser(input)
      input = expandvars(input)
      if isabs(input):
          return Path(input)
      else:
          return root.joinpath(input)
  
subject: add missed file