hass.tibber_prices/docs/development/coding-guidelines.md

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# Coding Guidelines
> **Note:** For complete coding standards, see [`AGENTS.md`](../../AGENTS.md).
## Code Style
- **Formatter/Linter**: Ruff (replaces Black, Flake8, isort)
- **Max line length**: 120 characters
- **Max complexity**: 25 (McCabe)
- **Target**: Python 3.13
Run before committing:
```bash
./scripts/lint
```
## Import Order
1. Python stdlib (specific types only)
2. Third-party (`homeassistant.*`, `aiohttp`)
3. Local (`.api`, `.const`)
## Critical Patterns
### Time Handling
Always use `dt_util` from `homeassistant.util`:
```python
from homeassistant.util import dt as dt_util
price_time = dt_util.parse_datetime(starts_at)
price_time = dt_util.as_local(price_time) # Convert to HA timezone
now = dt_util.now()
```
### Translation Loading
```python
# In __init__.py async_setup_entry:
await async_load_translations(hass, "en")
await async_load_standard_translations(hass, "en")
```
### Price Data Enrichment
Always enrich raw API data:
```python
from .price_utils import enrich_price_info_with_differences
enriched = enrich_price_info_with_differences(
price_info_data,
thresholds,
)
```
See [`AGENTS.md`](../../AGENTS.md) for complete guidelines.