def isvisible(self):
        return self._shown
content: collection of str, each str is a chunk in response
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/site-packages/turtle.py/TPen.isvisible--crossover with--dataset/ETHPy150Open shazow/urllib3/test/test_response.py/MockChunkedEncodingResponse.__init__