How to Load a .env File Manually in Python

import re
from pathlib import Path


def load_dotenv_file(filepath: str) -> dict[str, str]:
    """Parse a .env-style file into a dictionary."""
    env = {}
    path = Path(filepath)

    if not path.exists():
        raise FileNotFoundError(f"Environment file not found: {filepath}")

    for line in path.read_text().splitlines():
        line = line.strip()
        if not line or line.startswith("#"):
            continue
        key, _, value = line.partition("=")
        key = key.strip()
        value = value.strip()
        if not key:
            continue
        if len(value) >= 2 and value.startswith('"') and value.endswith('"'):
            value = value[1:-1]
        env[key] = value

    return env


if __name__ == "__main__":
    import tempfile

    with tempfile.NamedTemporaryFile(mode="w", suffix=".env", delete=False) as f:
        f.write("# Development settings\nDB_HOST=localhost\nDB_PORT=5432\n")
        env_path = f.name

    env_data = load_dotenv_file(env_path)
    print(env_data)