# otp.Source.modify_symbol_name

#### Source.modify_symbol_name(symbol_name, inplace=False)

Modifies the name of the symbol that provides input ticks for this node.
Uses MODIFY_SYMBOL_NAME EP.

* **Parameters:**
  * **symbol_name** (str, [`Column`](../operation/root.md#onetick.py.Column), [`Operation`](../operation/root.md#onetick.py.Operation)) -- String or expression with new SYMBOL_NAME value.
    New SYMBOL_NAME must not depend on ticks, if set via expression.
  * **inplace** ([*bool*](https://docs.python.org/3/library/functions.html#bool)) -- The flag controls whether operation should be applied inplace or not.
    If `inplace=True`, then it returns nothing.
    Otherwise method returns a new modified object.
  * **self** ([*Source*](root.md#onetick.py.Source))
* **Return type:**
  [`Source`](root.md#onetick.py.Source) or `None`

### Examples

Replacing with static string:

```pycon
>>> data = otp.DataSource('SOME_DB', symbol='S1', tick_type='TT')
>>> data = data.modify_symbol_name(symbol_name='S2')
>>> otp.run(data)
                     Time   X
0 2003-12-01 00:00:00.000  -3
1 2003-12-01 00:00:00.001  -2
2 2003-12-01 00:00:00.002  -1
```

Replacing with expression:

```pycon
>>> data = otp.DataSource('SOME_DB', symbol='S2', tick_type='TT')
>>> data = data.modify_symbol_name(symbol_name=data['_SYMBOL_NAME'].str.replace('2', '1'))
>>> otp.run(data)
                     Time  X
0 2003-12-01 00:00:00.000  1
1 2003-12-01 00:00:00.001  2
2 2003-12-01 00:00:00.002  3
```

#### SEE ALSO
**MODIFY_SYMBOL_NAME** OneTick event processor