René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Interconnect treats string as list","articleBody":"If you pass the `interconnect` function a string instead of a list, it treats the string as a list (of characters).  For example:\r\n```\r\nP1 = ct.rss(2, 1, 1)\r\nP1_iosys = ct.LinearIOSystem(P1, inputs='u1', outputs='y1')\r\nP2 = ct.rss(2, 1, 1)\r\nP2_iosys = ct.LinearIOSystem(P2, inputs='y1', outputs='y2')\r\nP_series = ct.interconnect([P1_iosys, P2_iosys], inputs=['u1'], outputs=('y2'))\r\n```\r\ngenerates the following error:\r\n```\r\nValueError: could not find signal y\r\n\r\n```\r\nThe problem appears to be that `('y2')` is the same as `'y2'` in Python and is being interpreted as `['y', '2']`.  Changing this to `outputs=('y2',)` or `outputs=['y2']` fixes the problem, but it is still a bug.\r\n","author":{"url":"https://github.com/murrayrm","@type":"Person","name":"murrayrm"},"datePublished":"2022-01-19T01:11:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/692/python-control/issues/692"}