René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Pip caching should include Python version in cache key","articleBody":"**Description:**\r\nCaching with `cache: 'pip'` will not include the Python version in the cache key, which leads to a cache that only speeds up the Python version that happened to create the original cache.\r\n\r\n**Action version:**\r\nv2\r\n\r\n**Platform:**\r\n- [x] Ubuntu\r\n- [ ] macOS\r\n- [ ] Windows\r\n\r\n**Runner type:**\r\n- [x] Hosted\r\n- [ ] Self-hosted\r\n\r\n**Tools version:**\r\nN/A\r\n\r\n**Repro steps:**  \r\nI'm fixing the pip caching for the [coqui-ai/TTS](https://github.com/coqui-ai/TTS) repo to speed-up the initial setup. We use matrix strategies to test across Python 3.6, 3.7, 3.8 and 3.9. I replaced an older broken actions/cache@v1 setup with the new caching functionality here, and saw a significant speed-up for Python 3.9 tasks, because it was a Py 3.9 job that happened to finish first and write the cache:\r\n\r\nBefore: https://github.com/coqui-ai/TTS/runs/4559378226?check_suite_focus=true\r\nAfter: https://github.com/coqui-ai/TTS/runs/4559480121?check_suite_focus=true\r\n\r\nOn a different job running on Python 3.7, changing to the caching funcionality in setup-python actually slowed things down:\r\n\r\nBefore: https://github.com/coqui-ai/TTS/runs/4559377735?check_suite_focus=true\r\nAfter: https://github.com/coqui-ai/TTS/runs/4559592755?check_suite_focus=true\r\n\r\nThis is because we spend extra time downloading the cache, but then can't use it.\r\n\r\n**Expected behavior:**\r\nThe pip cache should be keyed by Python version.\r\n\r\n**Actual behavior:**\r\nThe pip cache is shared between Python versions, leading to cached wheels not being used in subsequent runs with different Python versions.","author":{"url":"https://github.com/reuben","@type":"Person","name":"reuben"},"datePublished":"2021-12-17T11:29:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/304/setup-python/issues/304"}