38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
import argparse
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import tempfile
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import polars as pl
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from pathlib import Path
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from pipeline.utils import download, extract_zip
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URL = "https://www.arcgis.com/sharing/rest/content/items/077631e063eb4e1ab43575d01381ec33/data"
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def convert_to_parquet(data_path: Path, parquet_path: Path) -> None:
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df = pl.scan_csv(data_path / "Data/NSPL_MAY_2025_UK.csv", try_parse_dates=True)
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print(f"Columns: {df.collect_schema().names()}")
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parquet_path.parent.mkdir(parents=True, exist_ok=True)
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df.sink_parquet(parquet_path, compression="zstd")
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print(f"Saved to {parquet_path}")
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def main() -> None:
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parser = argparse.ArgumentParser(
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description="Download and convert ArcGIS postcode data"
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)
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parser.add_argument(
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"--output", type=Path, required=True, help="Output parquet file path"
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)
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args = parser.parse_args()
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with tempfile.TemporaryDirectory() as cache_dir:
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download_path = Path(cache_dir) / "arcgis_data.zip"
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extract_path = Path(cache_dir) / "arcgis_extracted"
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download(URL, download_path)
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extract_zip(download_path, extract_path)
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convert_to_parquet(extract_path, args.output)
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if __name__ == "__main__":
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main()
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