def _getNWSChar(self) :
        index = self._indexOfNextNWSChar()

        # Save all chars read into 
        old_current = self.current_
        self.current_ = index
        self.context_.addData(self.buffer_[old_current:],
                              old_current-self.current_)

        return self._getChar()
  
    # Peek at the next non-white character
dataset/ETHPy150Open redhat-imaging/imagefactory/imgfac/picklingtools/parsereader.py/StringReader._getNWSChar/swapped operands of `-`