code: def seek(self, pos, whence=os.SEEK_SET):
          
          if self.closed:
              raise ValueError("I/O operation on closed file")
  
          if whence == os.SEEK_SET:
              self.position = min(max(pos, 0), self.size)
          elif whence == os.SEEK_CUR:
              if pos < 0:
                  self.position = max(self.position + pos, 0)
              else:
                  self.position = min(self.position + pos, self.size)
          elif whence == os.SEEK_END:
              self.position = max(min(self.size + pos, self.size), 0)
          else:
              raise ValueError("Invalid argument")
  
          self.buffer = b""
          self.fileobj.seek(self.position)
docs: Seek to a position in the file.