# otp.math.pi

### pi()

Returns the value of Pi number.

* **Return type:**
  [`Operation`](../../operation/root.md#onetick.py.Operation)

### Examples

```pycon
>>> data = otp.Tick(A=1)
>>> data['PI'] = otp.math.pi()
>>> otp.run(data)
        Time  A        PI
0 2003-12-01  1  3.141593
```