# forge.ta.PeriodOpen

```python
forge.ta.PeriodOpen(**inputs: Any) -> None
```

The opening price of the current day, week or month.

A trading day starts at day_boundary; period D, W or M is defined as for prior levels.

period_open is the open of the first bar of the current period, shown on every bar of that period. A period already under way at the first bar of the data has no value.

Since Forge API 1.