# otp.Operation.str.upper

### upper()

Converts a string to upper case.

* **Returns:**
  Uppercased string
* **Return type:**
  [Operation](../root.md#onetick.py.Operation)

### Examples

```pycon
>>> data = otp.Ticks(X=['HeLlO', 'wOrLd!'])
>>> data['UP'] = data['X'].str.upper()
>>> otp.run(data)
                     Time       X      UP
0 2003-12-01 00:00:00.000   HeLlO   HELLO
1 2003-12-01 00:00:00.001  wOrLd!  WORLD!
```