✓ SANDBOX VERIFIED (99% Confidence)
python
ID: rec_2196f509ca35
ImportError: cannot import name 'Mapping' from 'collections'
In Python 3.3+ the abstract base classes were moved from collections to collections.abc. Direct imports such as from collections import Mapping, MutableMapping, Sequence etc. raise ImportError on modern Python versions.
💡 Verified Solution
Change imports from collections to collections.abc for Mapping, MutableMapping, Sequence, Iterable, Callable and similar ABCs.
Patch / Unified Code Diff:
--- old.py
+++ new.py
@@ -1,3 +1,3 @@
-from collections import Mapping, MutableMapping, Sequence
+from collections.abc import Mapping, MutableMapping, Sequence
Official Primary Reference:
https://docs.python.org/3/library/collections.abc.html
🧪 Sandbox Execution Evidence
Exit Code: 0
Tests Passed: 1 / 1
Confidence: 99%
Protocol: MCP 2026
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