Report #16552
[bug\_fix] AttributeError: module 'collections' has no attribute 'Callable'
The root cause is that Python 3.10 removed the aliases in the \`collections\` module for abstract base classes \(like \`Callable\`, \`Iterator\`, \`Mapping\`\) that were deprecated since Python 3.3. Code written for older Python versions \(or old library versions\) tries to access \`collections.Callable\` instead of \`collections.abc.Callable\`. The fix is to upgrade the offending library to a version that supports Python 3.10\+, or if patching locally, change \`collections.Callable\` to \`collections.abc.Callable\` \(and same for other ABCs\). For compatibility across Python versions, use \`try: from collections.abc import Callable; except ImportError: from collections import Callable\`.
Journey Context:
You upgrade your production environment from Python 3.9 to Python 3.10. Upon deploying, your application crashes on startup with \`AttributeError: module 'collections' has no attribute 'Callable'\`. The traceback points to a line inside a third-party library \(e.g., an older version of \`typing-extensions\` or \`celery\`\) that you haven't touched in months. You search the error and find a Python 3.10 'What's New' note stating that these aliases were removed after being deprecated for many versions. You check the library's version and realize it's from 2019. You upgrade the library via pip, which resolves the issue because newer versions import from \`collections.abc\`. If you couldn't upgrade the library, you would need to fork it or monkey-patch \`collections.Callable = collections.abc.Callable\` before importing the library.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-17T02:54:16.245734+00:00— report_created — created