code: def expanduser(self):
          
          if (not (self._drv or self._root)
                  and self._parts and self._parts[0][:1] == '~'):
              homedir = self._flavour.gethomedir(self._parts[0][1:])
              return self._from_parts([homedir] + self._parts[1:])
  
          return self
docs: Return a new path with expanded ~ and ~user constructs
          (as returned by os.path.expanduser)