René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Extract \"Unsupported operand types\" exception to separate method","articleBody":"[Returning exception](https://github.com/RustPython/RustPython/blob/master/vm/src/vm.rs#L517) in `call_or_unsupported` should be extracted to a separate method.\r\nAlso, use it to replace incorrect exceptions in objfloat.rs (and others).\r\n\r\nThis should fix wrong exceptions, such as\r\n```\r\n\u003e\u003e\u003e\u003e\u003e 1.1 - \"a\"\r\nTraceback (most recent call last):\r\n  File \u003cunknown\u003e, line 0, in \u003cmodule\u003e\r\nTypeError: Cannot add RefCell { value: [PyObj float 1.1] } and RefCell { value: [PyObj str \"a\"] }\r\n```\r\nshould be\r\n```\r\n\u003e\u003e\u003e 1.1 - \"a\"\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\nTypeError: unsupported operand type(s) for -: 'float' and 'str'\r\n```","author":{"url":"https://github.com/BojanKogoj","@type":"Person","name":"BojanKogoj"},"datePublished":"2018-11-17T10:33:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/199/RustPython/issues/199"}