{ "run_id": 2, "model": "qwen2.5-coder-3b", "mode": "oneshot", "challenge": "calculator", "sample": 0, "status": "ok", "error": null, "score_total": 48.6, "score_tests": 0.14285714285714285, "score_deliverables": 1.0, "score_content": 1.0, "tests_passed": 1, "tests_failed": 6, "wall_secs": 15.61372812501213, "slug": "run2-qwen2.5-coder-3b-oneshot-calculator-s0", "challenge_title": "Expression evaluator (no eval)", "spec": "Create calc.py with exactly one public function:\n\nevaluate(expr: str) -> float\n Evaluate an arithmetic expression containing numbers (integers or decimals), the binary operators + - * /, unary minus, parentheses, and arbitrary whitespace. Normal precedence: * and / bind tighter than + and -; operators of equal precedence associate left to right. Division is true division. Examples: evaluate(\"2+3*4\") == 14, evaluate(\"(2+3)*4\") == 20, evaluate(\"2*-3\") == -6.\n\nYou must parse the expression yourself: using eval() or exec() is forbidden and is checked by the test suite. Use only the Python standard library.", "expected_files": [ "calc.py" ], "content_checks": { "calc.py": [ "def evaluate" ] }, "test_files": { "test_calc.py": "from pathlib import Path\n\nfrom calc import evaluate\n\n\ndef test_precedence():\n assert evaluate(\"2+3*4\") == 14\n\n\ndef test_parentheses():\n assert evaluate(\"(2+3)*4\") == 20\n assert evaluate(\"2*(3+(4-1))\") == 12\n\n\ndef test_true_division():\n assert evaluate(\"10/4\") == 2.5\n\n\ndef test_left_associativity():\n assert evaluate(\"10-3-2\") == 5\n assert evaluate(\"16/4/2\") == 2\n\n\ndef test_unary_minus():\n assert evaluate(\"-3+5\") == 2\n assert evaluate(\"2*-3\") == -6\n\n\ndef test_whitespace_and_decimals():\n assert evaluate(\" 1.5 + 2.25 \") == 3.75\n\n\ndef test_does_not_use_eval():\n src = Path(\"calc.py\").read_text()\n assert \"eval(\" not in src\n assert \"exec(\" not in src\n" }, "events": [ { "ts": "2026-07-17T15:31:49.088206+00:00", "event": "start", "run": 2, "model": "qwen2.5-coder-3b", "mode": "oneshot", "challenge": "calculator", "sample": 0 }, { "ts": "2026-07-17T15:31:49.088242+00:00", "event": "prompt", "mode": "oneshot", "content": "You are completing a coding task in one shot. Write complete files that satisfy the spec below. Tests (pytest) will be run against your files; you cannot run them yourself.\n\nReply with ONE JSON object and nothing else:\n{\"files\": {\"\": \"\", ...}}\n\nRequired deliverable files: calc.py\n\nSPEC:\nCreate calc.py with exactly one public function:\n\nevaluate(expr: str) -> float\n Evaluate an arithmetic expression containing numbers (integers or decimals), the binary operators + - * /, unary minus, parentheses, and arbitrary whitespace. Normal precedence: * and / bind tighter than + and -; operators of equal precedence associate left to right. Division is true division. Examples: evaluate(\"2+3*4\") == 14, evaluate(\"(2+3)*4\") == 20, evaluate(\"2*-3\") == -6.\n\nYou must parse the expression yourself: using eval() or exec() is forbidden and is checked by the test suite. Use only the Python standard library.\n" }, { "ts": "2026-07-17T15:32:04.510494+00:00", "event": "completion", "content": "```json\n{\n \"files\": {\n \"calc.py\": \"def evaluate(expr: str) -> float:\\n # Split the expression into tokens\\n tokens = expr.replace(' ', '').split()\\n\\n # Define a helper function to evaluate an operator\\n def apply_operator(operators, values):\\n operator = operators.pop()\\n right = values.pop()\\n left = values.pop()\\n if operator == '+':\\n values.append(left + right)\\n elif operator == '-':\\n values.append(left - right)\\n elif operator == '*':\\n values.append(left * right)\\n elif operator == '/':\\n values.append(left / right)\\n\\n # Define a helper function to evaluate an expression with parentheses\\n def evaluate_parentheses(tokens):\\n operators = []\\n values = []\\n i = 0\\n while i < len(tokens):\\n if tokens[i] == '(':\\n j = i + 1\\n balance = 1\\n while balance > 0:\\n if tokens[j] == '(':\\n balance += 1\\n elif tokens[j] == ')':\\n balance -= 1\\n j += 1\\n values.append(evaluate_parentheses(tokens[i+1:j-1]))\\n i = j - 1\\n elif tokens[i].isdigit() or (tokens[i][0] == '-' and tokens[i][1:].isdigit()):\\n num = float(tokens[i])\\n while i + 1 < len(tokens) and tokens[i+1].isdigit():\\n num = num * 10 + float(tokens[i+1])\\n i += 1\\n values.append(num)\\n elif tokens[i] in '+-*/':\\n while (operators and operators[-1] != '(' and\\n ((tokens[i] == '*' or tokens[i] == '/') and\\n (operators[-1] == '+' or operators[-1] == '-'))):\\n apply_operator(operators, values)\\n operators.append(tokens[i])\\n i += 1\\n while operators:\\n apply_operator(operators, values)\\n return values[0]\\n\\n # Evaluate the expression\\n return evaluate_parentheses(tokens)\"\n }\n}\n```", "tokens": 500 }, { "ts": "2026-07-17T15:32:04.511239+00:00", "event": "write_file", "path": "calc.py", "bytes": 2029 }, { "ts": "2026-07-17T15:32:04.701851+00:00", "event": "graded", "total": 48.6, "tests_passed": 1, "tests_failed": 6, "output": "FFFFFF. [100%]\n=================================== FAILURES ===================================\n_______________________________ test_precedence ________________________________\ntest_calc.py:7: in test_precedence\n assert evaluate(\"2+3*4\") == 14\n ^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_______________________________ test_parentheses _______________________________\ntest_calc.py:11: in test_parentheses\n assert evaluate(\"(2+3)*4\") == 20\n ^^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n______________________________ test_true_division ______________________________\ntest_calc.py:16: in test_true_division\n assert evaluate(\"10/4\") == 2.5\n ^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n___________________________ test_left_associativity ____________________________\ntest_calc.py:20: in test_left_associativity\n assert evaluate(\"10-3-2\") == 5\n ^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_______________________________ test_unary_minus _______________________________\ntest_calc.py:25: in test_unary_minus\n assert evaluate(\"-3+5\") == 2\n ^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_________________________ test_whitespace_and_decimals _________________________\ntest_calc.py:30: in test_whitespace_and_decimals\n assert evaluate(\" 1.5 + 2.25 \") == 3.75\n ^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n=========================== short test summary info ============================\nFAILED test_calc.py::test_precedence - IndexError: list index out of range\nFAILED test_calc.py::test_parentheses - IndexError: list index out of range\nFAILED test_calc.py::test_true_division - IndexError: list index out of range\nFAILED test_calc.py::test_left_associativity - IndexError: list index out of ...\nFAILED test_calc.py::test_unary_minus - IndexError: list index out of range\nFAILED test_calc.py::test_whitespace_and_decimals - IndexError: list index ou...\n6 failed, 1 passed in 0.02s\n" } ], "files": { "calc.py": "def evaluate(expr: str) -> float:\n # Split the expression into tokens\n tokens = expr.replace(' ', '').split()\n\n # Define a helper function to evaluate an operator\n def apply_operator(operators, values):\n operator = operators.pop()\n right = values.pop()\n left = values.pop()\n if operator == '+':\n values.append(left + right)\n elif operator == '-':\n values.append(left - right)\n elif operator == '*':\n values.append(left * right)\n elif operator == '/':\n values.append(left / right)\n\n # Define a helper function to evaluate an expression with parentheses\n def evaluate_parentheses(tokens):\n operators = []\n values = []\n i = 0\n while i < len(tokens):\n if tokens[i] == '(':\n j = i + 1\n balance = 1\n while balance > 0:\n if tokens[j] == '(':\n balance += 1\n elif tokens[j] == ')':\n balance -= 1\n j += 1\n values.append(evaluate_parentheses(tokens[i+1:j-1]))\n i = j - 1\n elif tokens[i].isdigit() or (tokens[i][0] == '-' and tokens[i][1:].isdigit()):\n num = float(tokens[i])\n while i + 1 < len(tokens) and tokens[i+1].isdigit():\n num = num * 10 + float(tokens[i+1])\n i += 1\n values.append(num)\n elif tokens[i] in '+-*/':\n while (operators and operators[-1] != '(' and\n ((tokens[i] == '*' or tokens[i] == '/') and\n (operators[-1] == '+' or operators[-1] == '-'))):\n apply_operator(operators, values)\n operators.append(tokens[i])\n i += 1\n while operators:\n apply_operator(operators, values)\n return values[0]\n\n # Evaluate the expression\n return evaluate_parentheses(tokens)" }, "file_metrics": [ { "path": "calc.py", "loc": 54, "sloc": 47, "chars": 2029, "is_python": true, "functions": 3, "classes": 0, "complexity": 23, "max_complexity": 23, "max_depth": 7, "imports": [], "avg_function_len": 32.7, "parse_error": false } ], "code": { "files": 1, "loc": 54, "sloc": 47, "chars": 2029, "functions": 3, "classes": 0, "complexity": 23, "max_complexity": 23, "max_depth": 7, "imports": [], "avg_function_len": 32.7, "parse_errors": 0 }, "session": { "model_calls": 1, "actions": {}, "bad_actions": 0, "test_runs": 0, "tokens_out": 500, "tokens_in": 0, "turns": 0 }, "test_output": "FFFFFF. [100%]\n=================================== FAILURES ===================================\n_______________________________ test_precedence ________________________________\ntest_calc.py:7: in test_precedence\n assert evaluate(\"2+3*4\") == 14\n ^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_______________________________ test_parentheses _______________________________\ntest_calc.py:11: in test_parentheses\n assert evaluate(\"(2+3)*4\") == 20\n ^^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n______________________________ test_true_division ______________________________\ntest_calc.py:16: in test_true_division\n assert evaluate(\"10/4\") == 2.5\n ^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n___________________________ test_left_associativity ____________________________\ntest_calc.py:20: in test_left_associativity\n assert evaluate(\"10-3-2\") == 5\n ^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_______________________________ test_unary_minus _______________________________\ntest_calc.py:25: in test_unary_minus\n assert evaluate(\"-3+5\") == 2\n ^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n_________________________ test_whitespace_and_decimals _________________________\ntest_calc.py:30: in test_whitespace_and_decimals\n assert evaluate(\" 1.5 + 2.25 \") == 3.75\n ^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:54: in evaluate\n return evaluate_parentheses(tokens)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\ncalc.py:51: in evaluate_parentheses\n return values[0]\n ^^^^^^^^^\nE IndexError: list index out of range\n=========================== short test summary info ============================\nFAILED test_calc.py::test_precedence - IndexError: list index out of range\nFAILED test_calc.py::test_parentheses - IndexError: list index out of range\nFAILED test_calc.py::test_true_division - IndexError: list index out of range\nFAILED test_calc.py::test_left_associativity - IndexError: list index out of ...\nFAILED test_calc.py::test_unary_minus - IndexError: list index out of range\nFAILED test_calc.py::test_whitespace_and_decimals - IndexError: list index ou...\n6 failed, 1 passed in 0.02s\n" }