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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Handle non-iterables for `ntpath.commonpath`","articleBody":"# Bug report\n\n### Bug description:\n\n```python\n\u003e\u003e\u003e import ntpath\n\u003e\u003e\u003e ntpath.commonpath(None)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\n  File \"\u003cfrozen ntpath\u003e\", line 826, in commonpath\nValueError: commonpath() arg is an empty sequence\n```\n\nExpected: `TypeError: 'NoneType' object is not iterable` like for `posixpath.commonpath`.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-117336\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/nineteendo","@type":"Person","name":"nineteendo"},"datePublished":"2024-03-28T19:04:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/117335/cpython/issues/117335"}