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| """File-hashing helper used by the paper-notebook freeze CI check.""" | |
| from __future__ import annotations | |
| import hashlib | |
| from pathlib import Path | |
| _CHUNK = 64 * 1024 | |
| def sha256_file(path: str | Path) -> str: | |
| """Return the hex-digest SHA-256 of a file, streaming 64KB chunks. | |
| Streaming (rather than ``open(...).read()``) keeps memory bounded for | |
| notebooks with embedded image outputs that can hit hundreds of MB. | |
| """ | |
| h = hashlib.sha256() | |
| path = Path(path) | |
| with path.open("rb") as f: | |
| while chunk := f.read(_CHUNK): | |
| h.update(chunk) | |
| return h.hexdigest() | |