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path-and-io

Use this when reading from or writing to local files — including constructing file paths with pathlib, creating directories, choosing output locations, and using path utilities from src/analysis_project/paths.py.

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Skill: Path and I/O

Use this skill when reading from or writing to local files.

Rules

  • Use pathlib.Path for all file path operations.
  • Do not hard-code absolute local paths.
  • Prefer paths relative to repository root or configured directories.
  • Use the path utilities in src/analysis_project/paths.py.
  • Do not write outputs into raw data directories (data/raw/, data/external/).
  • Create parent directories explicitly when writing outputs: path.parent.mkdir(parents=True, exist_ok=True).
  • Use descriptive file names.
  • Include dates or run identifiers when outputs are time-dependent.
  • Avoid overwriting existing outputs unless explicitly requested.

Available Utilities

src/analysis_project/paths.py provides:

  • get_repo_root() — リポジトリルートの Path
  • data_dir() — data/ ディレクトリの Path
  • outputs_dir() — outputs/ ディレクトリの Path
  • ensure_parent_dir(path) — 親ディレクトリを作成してパスを返す

Examples

from analysis_project.paths import data_dir, outputs_dir, ensure_parent_dir

# 入力データの読み込み
input_path = data_dir() / "raw" / "titanic" / "train.csv"

# 出力パスを構成して書き込み
output_path = outputs_dir() / "tables" / "summary_2024q1.csv"
ensure_parent_dir(output_path)
df.write_csv(output_path)

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