René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect highlighting because of flaws in ObjectAssignmentParser","articleBody":"When checking whether an object is correctly created and the exercise only contains a single `=` operator in addition to other 'object-mutating' operations that don't use `=`, highlighting trips up.\r\n\r\n## Reproducible example (in words)\r\n\r\n```python\r\n# solution\r\nx = []\r\nfor i in range(3):\r\n    x.append(i)\r\n\r\n# sct\r\nEx().check_object('x').has_equal_value()\r\n```\r\n\r\nIf the student submits:\r\n\r\n```python\r\n# student\r\nx = []\r\nfor i in range(3):\r\n    x.append(2 * i)\r\n```\r\n\r\nThe `x = []` will be highlighted, even though the mistake is in the `x.append()` step. This is extremely confusing for students! You can see it in action [here](https://www.dropbox.com/s/me22ch8ojuqb1en/Screenshot%202018-09-25%2013.19.00.png?dl=0)\r\n\r\n## Reproducible example (in code)\r\n\r\n```python\r\nfrom pythonwhat.local import setup_state\r\nfrom pythonwhat.Test import TestFail\r\nsol_code = \"x = []\\nfor i in range(3): x.append(i)\"\r\nstu_code = \"x = []\\nfor i in range(3): x.append(2 * i)\"\r\ns = setup_state(sol_code, stu_code)\r\ntry:\r\n    s.check_object('x').has_equal_value()\r\nexcept TestFail as e:\r\n    line_info = e.feedback.line_info\r\n\r\nline_info\r\n```\r\n\r\nThis will print out:\r\n\r\n```\r\n{'column_start': 0, 'line_start': 1, 'line_end': 1, 'column_end': 6}\r\n```\r\n\r\nWhile it should have a `line_start` on `line_end` equal to 2, _or just not highlight anything at all_.","author":{"url":"https://github.com/filipsch","@type":"Person","name":"filipsch"},"datePublished":"2018-09-26T15:49:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/359/pythonwhat/issues/359"}