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https://github.com/PR0M3TH3AN/python_charts.git
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75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
from __future__ import annotations
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from datetime import datetime
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from pathlib import Path
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from typing import Iterable
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import matplotlib.pyplot as plt
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import pandas as pd
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import sqlite3
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def save_figure(fig: plt.Figure, output: str | None, script_path: str) -> Path:
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"""Save ``fig`` to ``output`` or ``outputs/`` with timestamp."""
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out_path = (
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Path(output)
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if output is not None
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else Path("outputs")
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/ f"{Path(script_path).stem}_{datetime.now().strftime('%Y%m%d_%H%M%S')}.png"
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)
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out_path.parent.mkdir(parents=True, exist_ok=True)
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fig.savefig(out_path)
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print(f"Saved figure to {out_path}")
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return out_path
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def fetch_series_db(
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series: Iterable[str],
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start: datetime,
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end: datetime,
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db_path: str | Path = Path("data/fred.db"),
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) -> pd.DataFrame:
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"""Load one or more FRED series from a local SQLite DB."""
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db_path = Path(db_path)
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if not db_path.exists():
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raise FileNotFoundError(
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f"{db_path} not found. Run scripts/refresh_data.py on a machine with internet, commit the DB, then retry."
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)
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frames: list[pd.DataFrame] = []
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with sqlite3.connect(db_path) as conn:
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for name in series:
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df = pd.read_sql(
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f"SELECT date, {name} FROM {name}",
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conn,
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parse_dates=["date"],
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index_col="date",
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).loc[start:end]
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df.rename(columns={name: name}, inplace=True)
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frames.append(df)
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if not frames:
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raise ValueError("No series loaded")
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return pd.concat(frames, axis=1).sort_index()
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def validate_dataframe(df: pd.DataFrame, name: str) -> None:
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"""Ensure dataframe has a ``value`` column with data and DatetimeIndex."""
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if df.empty:
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raise ValueError(f"{name} dataframe is empty")
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if "value" not in df.columns:
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raise ValueError(f"{name} missing 'value' column")
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if df["value"].isna().any():
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raise ValueError(f"{name} contains null values")
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if not isinstance(df.index, pd.DatetimeIndex):
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raise ValueError("Indexes must be DatetimeIndex")
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def validate_overlap(df1: pd.DataFrame, df2: pd.DataFrame) -> None:
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"""Verify that two series share a non-empty overlapping date range."""
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start = max(df1.index.min(), df2.index.min())
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end = min(df1.index.max(), df2.index.max())
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if start >= end:
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raise ValueError("Series have no overlapping date range")
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