From 8cc3b4697b391ff6e197dd1d93b7a4b9d3dcc483 Mon Sep 17 00:00:00 2001 From: "codeflash-ai[bot]" <148906541+codeflash-ai[bot]@users.noreply.github.com> Date: Sat, 21 Feb 2026 02:25:51 +0000 Subject: [PATCH] Optimize CodeStringsMarkdown.file_to_path The optimization achieves a **54% runtime improvement** by replacing the cache check pattern from "if key in dict" + "return dict[key]" to a more Pythonic "try/except KeyError" approach. **Key Performance Gain:** In the original code, the cache hit path (which occurs in 99% of calls based on the test annotations) performs **two dictionary lookups**: 1. `"file_to_path" in self._cache` - checks key existence 2. `return self._cache["file_to_path"]` - retrieves the value The optimized version uses **EAFP (Easier to Ask for Forgiveness than Permission)** pattern with try/except, which performs only **one dictionary lookup** on the happy path: 1. `return self._cache["file_to_path"]` - directly retrieves the value (or raises KeyError) **Why This Is Faster:** The line profiler data confirms this improvement. For the cached case (1002 out of 1012 calls): - **Original**: Lines checking "if in cache" + return take 6.13ms total (3.21ms + 2.92ms) - **Optimized**: Try + return takes only 3.36ms (0.11ms + 3.25ms) The try/except pattern in Python is highly optimized at the C level. When no exception occurs (the common case), the overhead is minimal - just the cost of setting up the exception handler, which is cheaper than performing two dictionary hash lookups and comparisons. **Test Case Performance:** The optimization particularly excels in scenarios with repeated cache hits: - `test_cache_prevents_recomputation_and_returns_same_object`: 63.5% faster on second call - `test_empty_code_strings_returns_empty_dict_and_caches_it`: 72.6% faster on second call - `test_large_number_of_repeated_calls_consistent_results`: **84.6% faster** when calling 1000 times in a loop For first-time computations (cache miss), performance is nearly identical since both versions execute the same dictionary comprehension and caching logic. --- codeflash/models/models.py | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/codeflash/models/models.py b/codeflash/models/models.py index 70267c067..da1f3bfb3 100644 --- a/codeflash/models/models.py +++ b/codeflash/models/models.py @@ -331,11 +331,12 @@ def file_to_path(self) -> dict[str, str]: dict[str, str]: Mapping from file path (as string) to code. """ - if "file_to_path" in self._cache: + try: return self._cache["file_to_path"] - result = {str(code_string.file_path): code_string.code for code_string in self.code_strings} - self._cache["file_to_path"] = result - return result + except KeyError: + result = {str(code_string.file_path): code_string.code for code_string in self.code_strings} + self._cache["file_to_path"] = result + return result @staticmethod def parse_markdown_code(markdown_code: str, expected_language: str = "python") -> CodeStringsMarkdown: