code: def cwd(self, new_path):
          '''Sets the cwd during reads and writes'''
          old_cwd = self._cwd
          self._cwd = new_path
          return old_cwf cwd(self, new_path):
          '''Sets the cwd during reads and writes'''
          old_cwd = self._cwd
          self._cwd = new_path
          return old_cwd
docs: Sets the cwd during reads and writes