code: def dropna(self):
          '''
          Remove rows and cols that have no assigned measurements.
          Return new instance.
          '''
          new = self.copy()
          tmp = self._dict2DF(self, nan, True)
          new.row_labels = list(tmp.index)
          new.col_labels = list(tmp.columns)
          return nef dropna(self):
          '''
          Remove rows and cols that have no assigned measurements.
          Return new instance.
          '''
          new = self.copy()
          tmp = self._dict2DF(self, nan, True)
          new.row_labels = list(tmp.index)
          new.col_labels = list(tmp.columns)
          return new
docs: Remove rows and cols that have no assigned measurements.
          Return new instance.