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adhami3310 merged 2 commits into from
Apr 24, 2026
Merged

fix cyclical imports and improve performance #2

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1a33a65
fix cyclical imports and improve performance
adhami3310 Apr 24, 2026
5eb8363
update readme
adhami3310 Apr 24, 2026
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12 changes: 7 additions & 5 deletions README.md
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Expand Up @@ -45,14 +45,16 @@ Benchmark on CPython 3.13, walking the AST of `difflib.py` (~2000 lines,

| implementation | min time | relative |
| -------------------------- | -------- | -------- |
| `ast.walk` (stdlib) | ~2.3 ms | 1× |
| pure-Python equivalent | ~1.0 ms | ~2× |
| `fast_walk.walk_dfs` | ~18 µs | ~130× |
| `fast_walk.walk_unordered` | ~13 µs | ~180× |
| `ast.walk` (stdlib) | ~1.9 ms | 1× |
| pure-Python equivalent | ~400 µs | ~5× |
| `fast_walk.walk_dfs` | ~5.6 µs | ~340× |
| `fast_walk.walk_unordered` | ~4.3 µs | ~440× |

Both `fast_walk` entry points are semantically equivalent to
`list(ast.walk(node))` — they return the same set of AST nodes. They
differ only in visit order.
differ only in visit order. User-attached attributes outside `_fields`
(e.g. a `.parent` back-reference set by an AST transformer) are
ignored, matching `ast.walk`'s behaviour.

## Development

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