René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Ignore typing errors in individual blocks","articleBody":"It is already possible to silence errors using `# type: ignore` on individual lines, and - since #626) also for a whole file.\r\n\r\nAdditionally it would be nice to ignore errors on individual blocks. Especially on a class/function level when abstracting away an untyped library. For example:\r\n\r\n    class MyAbstraction:\r\n\r\n        def __init__(self, url: str) -\u003e None:\r\n            self.hostname = url.host  # \u003c-- I want this to be caught by the type-checker\r\n\r\n        def some_call(self) -\u003e int:\r\n            # type: ignore\r\n            result = api.untyped_call()\r\n            return result\r\n\r\n        def another_large_call(self) -\u003e int:\r\n            # type: ignore\r\n            result_1 = api.untyped_call_1()\r\n            result_2 = api.untyped_call_2()\r\n            result = result_1 + result_2\r\n            return result\r\n\r\nWhen running `mypy` in \"strict\" mode the code will be littered with messages like `Call to an untyped function ... in a typed context`. Currently the only options are:\r\n\r\n* Add `# type: ignore` on each line causing errors by the external library\r\n  * Disadvantage: Cumbersome (many type-comments needed)\r\n  * Advantage: Only the problematic calls are silenced\r\n* Add `# type: ignore` to the file\r\n  * Disadvantage: Typing errors unrelated to the external library become invisible\r\n  * Advantage: Only one line to add\r\n\r\nThe second option is best used if a module contains *only* calls to the external library. For new projects this is doable, but older/larger code-bases often need some refactoring for this. And this can be error-prone and seems risky to do *only* for type-hinting.\r\n\r\nHaving the option to disable errors on either a class-level or block-level would add a lot of flexibility.","author":{"url":"https://github.com/exhuma","@type":"Person","name":"exhuma"},"datePublished":"2019-06-07T12:25:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":22},"url":"https://github.com/6948/mypy/issues/6948"}