code: def save(self, file):
          
  
          w = Writer(**self.info)
  
          with open(file, 'wb') as fd:
              w.write(fd, self.rows)
docs: Save the image to the named *file*.
  
          See `.write()` if you already have an open file object.
  
          In general, you can only call this method once;
          after it has been called the first time the PNG image is written,
          the source data will have been streamed, and
          cannot be streamed again.