René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DocList raises exception for type object.","articleBody":"### Initial Checks\r\n\r\n- [X] I have read and followed [the docs](https://docs.docarray.org/) and still think this is a bug\r\n\r\n### Description\r\n\r\nThis [commit](https://github.com/docarray/docarray/commit/2f3b85e333446cfa9b8c4877c4ccf9ae49cae660) introduced a check to verify that DocList is not used with an object: \r\n```\r\n        if (\r\n            isinstance(item, object)\r\n            and not is_typevar(item)\r\n            and not isinstance(item, str)\r\n            and item is not Any\r\n        ):\r\n               raise TypeError('Expecting a type, got object instead')\r\n ```\r\n\r\nThis is quite a broad condition (it breaks things like `DocList[TorchTensor]`, or nested `DocList[DocList[...]]` for me for instance) as:\r\n- Almost everything will be an object so the first line if almost a catch-all. \r\n- `is_typevar` only checks for TypeVar objects.\r\n\r\nShould this not check as well for something `not isinstance(item, type)` instead of `not is_typevar` to allow for classes ?\r\nThis way only non class objects (like instances of class object that are not classes themselves) will raise the `TypeError`. \r\n\r\n### Example Code\r\n\r\n```Python\r\nfrom docarray import DocList\r\nfrom docarray.typing import TorchTensor\r\ntest = DocList[TorchTensor]\r\n```\r\n\r\n\r\n### Python, DocArray \u0026 OS Version\r\n\r\n```Text\r\n0.39.1\r\n```\r\n\r\n\r\n### Affected Components\r\n\r\n- [ ] [Vector Database / Index](https://docs.docarray.org/user_guide/storing/docindex/)\r\n- [X] [Representing](https://docs.docarray.org/user_guide/representing/first_step)\r\n- [ ] [Sending](https://docs.docarray.org/user_guide/sending/first_step/)\r\n- [ ] [storing](https://docs.docarray.org/user_guide/storing/first_step/)\r\n- [X] [multi modal data type](https://docs.docarray.org/data_types/first_steps/)","author":{"url":"https://github.com/corentinmarek","@type":"Person","name":"corentinmarek"},"datePublished":"2023-10-30T19:17:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1828/docarray/issues/1828"}