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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Two (possible) improvements at dataclasses.rst","articleBody":"**Documentation**\r\n\r\nObserved two possible improvements at [dataclasses.rst](https://github.com/python/cpython/blob/main/Doc/library/dataclasses.rst) \r\n\r\n1. One of the examples at line 705 is throwing an exception. I would kindly suggest to update ```x: List = []``` by ```x: list = field(default_factory=list)``` to avoid the following exception: ```ValueError: mutable default \u003cclass 'list'\u003e for field x is not allowed: use default_factory```\r\n2. Remove trailing whitespace in line 745 to avoid exception with automated Azure PR Validation.\r\n\r\n@ericvsmith I would be more than happy to raise a PR for above.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103773\n* gh-103774\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/xandrade","@type":"Person","name":"xandrade"},"datePublished":"2022-04-19T08:25:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/91687/cpython/issues/91687"}