René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Matplotlib deprecation warning","articleBody":"see, e.g.,\r\n\r\nhttps://travis-ci.org/python-control/python-control/jobs/325460249#L2815\r\n\r\nThe warning says:\r\n```\r\ntest_siso (control.tests.freqresp_test.TestFreqresp) ... /home/travis/miniconda/envs/test-environment/lib/python3.6/site-packages/matplotlib/cbook/deprecation.py:106: MatplotlibDeprecationWarning: Adding an axes using the same arguments as a previous axes currently reuses the earlier instance.  In a future version, a new instance will always be created and returned.  Meanwhile, this warning can be suppressed, and the future behavior ensured, by passing a unique label to each axes instance.\r\n```\r\n","author":{"url":"https://github.com/roryyorke","@type":"Person","name":"roryyorke"},"datePublished":"2018-01-06T19:29:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/183/python-control/issues/183"}