⚡ Bolt: Optimize dictionary grouping in dl_cleanup.py#64
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manupawickramasinghe merged 4 commits intomainfrom Apr 29, 2026
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Replace `dict.setdefault()` with `collections.defaultdict(list)` in `scripts/dl_cleanup.py`. `setdefault` evaluates its default argument on every single call, meaning an empty list is created and discarded for every single entry iteration. Using `defaultdict` shifts the list creation logic to only run when the key is actually missing, improving performance and reducing object allocations. Signed-off-by: Jules Agent <jules@agent.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
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Replace `dict.setdefault()` with `collections.defaultdict(list)` in `scripts/dl_cleanup.py`. `setdefault` evaluates its default argument on every single call, meaning an empty list is created and discarded for every single entry iteration. Using `defaultdict` shifts the list creation logic to only run when the key is actually missing, improving performance and reducing object allocations. Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
Replace `dict.setdefault()` with `collections.defaultdict(list)` in `scripts/dl_cleanup.py`. `setdefault` evaluates its default argument on every single call, meaning an empty list is created and discarded for every single entry iteration. Using `defaultdict` shifts the list creation logic to only run when the key is actually missing, improving performance and reducing object allocations. Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
Replace `dict.setdefault()` with `collections.defaultdict(list)` in `scripts/dl_cleanup.py`. `setdefault` evaluates its default argument on every single call, meaning an empty list is created and discarded for every single entry iteration. Using `defaultdict` shifts the list creation logic to only run when the key is actually missing, improving performance and reducing object allocations. Signed-off-by: Jules [bot] <jules@agent.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
manupawickramasinghe
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💡 What:
Replaced
dict.setdefault(key, []).append(val)withcollections.defaultdict(list)insidescripts/dl_cleanup.pyand addedimport collections.🎯 Why:
In Python,
setdefault(key, default_value)evaluates thedefault_valueargument on every call, regardless of whether the key exists. This means inprogmap.setdefault(entry.progname, []).append(entry), a new empty list[]was being instantiated and immediately discarded for every single parsed file entry.collections.defaultdict(list)evaluates the default factory function only when a missing key is encountered.📊 Impact:
Removes O(N) unnecessary list instantiations where N is the number of files parsed by
dl_cleanup.py. This provides a measurable speedup for large target download directories and reduces garbage collection pressure.🔬 Measurement:
Run
python3 scripts/dl_cleanup.py -dand ensure that the script still identifies the exact same versions of files to keep or delete without throwing errors.PR created automatically by Jules for task 6374713455321555764 started by @manupawickramasinghe