61 lines
2 KiB
Python
61 lines
2 KiB
Python
#!/usr/bin/env python3
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"""Download IoD2025 Deprivation Scores and convert to Parquet."""
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import httpx
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import polars as pl
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from pathlib import Path
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URL = "https://assets.publishing.service.gov.uk/media/691ded34513046b952c500bd/File_5_IoD2025_Scores_for_the_Indices_of_Deprivation.xlsx"
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BASE_DATA_PATH = Path("./data_sources")
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BASE_DATA_PATH.mkdir(exist_ok=True)
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XLSX_PATH = BASE_DATA_PATH / "IoD2025_Scores.xlsx"
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PARQUET_PATH = BASE_DATA_PATH / "IoD2025_Scores.parquet"
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def download_file(url: str, output_path: Path) -> None:
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"""Download file from URL."""
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print(f"Downloading from {url}...")
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with httpx.stream("GET", url, follow_redirects=True, timeout=60) as response:
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response.raise_for_status()
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total = int(response.headers.get("content-length", 0))
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downloaded = 0
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with open(output_path, "wb") as f:
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for chunk in response.iter_bytes(chunk_size=8192):
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f.write(chunk)
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downloaded += len(chunk)
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if total:
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print(f"\rDownloaded {downloaded / 1024 / 1024:.1f} MB / {total / 1024 / 1024:.1f} MB", end="")
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print(f"\nSaved to {output_path}")
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def convert_to_parquet(xlsx_path: Path, parquet_path: Path) -> None:
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"""Convert Excel sheet 2 to Parquet."""
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print("Reading Excel file (sheet 2)...")
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# Read the 2nd sheet (index 1) - IoD2025 Scores
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df = pl.read_excel(
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xlsx_path,
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sheet_id=2, # 1-indexed, so 2 = second sheet
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)
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print(f"Shape: {df.shape}")
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print(f"Columns: {df.columns}")
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df.write_parquet(parquet_path, compression="zstd")
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print(f"Saved to {parquet_path}")
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print(f"Excel size: {xlsx_path.stat().st_size / 1024 / 1024:.1f} MB")
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print(f"Parquet size: {parquet_path.stat().st_size / 1024 / 1024:.1f} MB")
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def main() -> None:
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if not XLSX_PATH.exists():
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download_file(URL, XLSX_PATH)
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else:
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print(f"Excel file already exists at {XLSX_PATH}, skipping download")
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convert_to_parquet(XLSX_PATH, PARQUET_PATH)
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if __name__ == "__main__":
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main()
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