MutaFix run: toolz-006

ranker nvidia/NVIDIA-Nemotron-3-Nano-30B-A3B · patcher nvidia/nemotron-3-super-120b-a12b · via Nebius Token Factory

fixedoutcome
5swall time
2model calls
$0.0003API cost
Benchmark ground truth (hidden from the agent)
toolz/recipes.py:21 · operator NEGCOND · function toolz/recipes.py::countby
- if not (not callable(key)):   (injected bug)+ if not callable(key):   (original)
retriever rank 1 of 20 · ranker position 1 · patched the right function yes · exact restore no

Trace

reproduce
+0.44s
1 failing test(s) · 1 failed, 185 passed, 1 skipped, 1 deselected · 0.44s
failing tests and errors
toolz/tests/test_recipes.py::test_countby
toolz/tests/test_recipes.py::test_countby
E   TypeError: 'int' object is not subscriptable
trace
+0.77s
re-ran 1 test file(s) with the trace plugin: 1 failing and 1 passing tests, 4 library functions ran in a failing test · 0.31s
toolz/tests/test_recipes.py
retrieve
+0.77s
161 functions indexed, 3 reachable from toolz/tests/test_recipes.py::test_countby in the static call graph. Kept 20 candidates, ranked by spectrum score (Ochiai), call graph and BM25 break ties.
candidates in retriever order
  1. toolz/recipes.py::countby call depth 1 · Ochiai 1.00 (failing 1, passing 0)
  2. toolz/itertoolz.py::frequencies call depth 2 · Ochiai 1.00 (failing 1, passing 0)
  3. toolz/__init__.py::__getattr__ call depth - · Ochiai 1.00 (failing 1, passing 0)
  4. toolz/itertoolz.py::getter call depth 2 · Ochiai 0.71 (failing 1, passing 1)
  5. toolz/itertoolz.py::unique call depth - · Ochiai 0.00 (failing 0, passing 0)
  6. toolz/functoolz.py::memoize.<locals>.memof call depth - · Ochiai 0.00 (failing 0, passing 0)
  7. toolz/_signatures.py::signature_or_spec call depth - · Ochiai 0.00 (failing 0, passing 0)
  8. toolz/itertoolz.py::isiterable call depth - · Ochiai 0.00 (failing 0, passing 0)
  9. toolz/functoolz.py::curry.__init__ call depth - · Ochiai 0.00 (failing 0, passing 0)
  10. toolz/_signatures.py::check_valid call depth - · Ochiai 0.00 (failing 0, passing 0)
  11. toolz/itertoolz.py::groupby call depth - · Ochiai 0.00 (failing 0, passing 0)
  12. toolz/functoolz.py::curry.__call__ call depth - · Ochiai 0.00 (failing 0, passing 0)
  13. toolz/functoolz.py::flip call depth - · Ochiai 0.00 (failing 0, passing 0)
  14. toolz/itertoolz.py::tail call depth - · Ochiai 0.00 (failing 0, passing 0)
  15. toolz/dicttoolz.py::_get_factory call depth - · Ochiai 0.00 (failing 0, passing 0)
  16. toolz/itertoolz.py::partition_all call depth - · Ochiai 0.00 (failing 0, passing 0)
  17. toolz/functoolz.py::_check_sigspec call depth - · Ochiai 0.00 (failing 0, passing 0)
  18. toolz/functoolz.py::curry.__signature__ call depth - · Ochiai 0.00 (failing 0, passing 0)
  19. toolz/functoolz.py::memoize call depth - · Ochiai 0.00 (failing 0, passing 0)
  20. toolz/functoolz.py::is_valid_args call depth - · Ochiai 0.00 (failing 0, passing 0)
rank
+0.77s
spectrum order kept (no model call)
  1. toolz/recipes.py::countby
  2. toolz/itertoolz.py::frequencies
  3. toolz/__init__.py::__getattr__
  4. toolz/itertoolz.py::getter
  5. toolz/itertoolz.py::unique
read
+2.4s
turn 1 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2087 in / 112 out · 1.63s · $0.00015

read toolz/recipes.py::countby

The failing test calls countby with an integer (0) as the key function, but the current implementation only checks `not callable(key)` which is true for integers, causing `key` to be treated as a literal value instead of being used as a function. This leads to trying to subscript an integer later in `frequencies(map(key, seq))`, resulting in the 'int' object is not subscriptable error.

patch
+5.31s
turn 2 · NVIDIA-Nemotron-3-Nano-30B-A3B · 2457 in / 181 out · 2.25s · $0.00019

The current condition `if not (not callable(key))` is equivalent to `if callable(key)`, but it's confusing and the logic is inverted in intent. The bug occurs when a non-callable (like integer 0) is passed as `key`; the current code treats it as a function and tries to use `getter` on it, but the condition check is backwards. The fix clarifies the intent: only use `getter` when `key` is not callable, preventing the erroneous behavior with integers.

--- a/toolz/recipes.py+++ b/toolz/recipes.py@@ -19,5 +19,7 @@         groupby     """-    if not (not callable(key)):+    if callable(key):+        pass+    else:         key = getter(key)     return frequencies(map(key, seq))

tests: all tests pass 186 passed, 1 skipped, 1 deselected

Final patch

--- a/toolz/recipes.py+++ b/toolz/recipes.py@@ -19,5 +19,7 @@         groupby     """-    if not (not callable(key)):+    if callable(key):+        pass+    else:         key = getter(key)     return frequencies(map(key, seq))