# otp.Source.Symbol
### *class* SymbolType
Bases: [`object`](https://docs.python.org/3/library/functions.html#object)
You can get symbol name and symbol parameters with this class.
### Examples
```pycon
>>> symbols = otp.Symbols('SOME_DB')
>>> symbols['PARAM'] = 'PAM'
>>> ticks = otp.DataSource('SOME_DB', tick_type='TT')
>>> ticks['SYMBOL_PARAM'] = ticks.Symbol['PARAM', str]
>>> ticks['SYMBOL_NAME'] = ticks.Symbol.name
>>> ticks = otp.merge([ticks], symbols=symbols)
>>> otp.run(ticks)
Time X SYMBOL_PARAM SYMBOL_NAME
0 2003-12-01 00:00:00.000 1 PAM S1
1 2003-12-01 00:00:00.000 -3 PAM S2
2 2003-12-01 00:00:00.001 2 PAM S1
3 2003-12-01 00:00:00.001 -2 PAM S2
4 2003-12-01 00:00:00.002 3 PAM S1
5 2003-12-01 00:00:00.002 -1 PAM S2
```
#### SEE ALSO
[Databases, symbols, and tick types](../../static/concepts/symbols.md#symbols-concept)
[Symbol Parameters Objects](../misc/symbol_param.md#symbol-parameters-objects)
#### *property* name
Get symbol name.
* **Return type:**
[\_SymbolParamColumn](../misc/symbol_param.md#onetick.py.core._source._symbol_param._SymbolParamColumn)
### Examples
```pycon
>>> symbols = otp.Symbols('SOME_DB')
>>> ticks = otp.DataSource('SOME_DB', tick_type='TT')
>>> ticks['SYMBOL_NAME'] = ticks.Symbol.name
>>> ticks = otp.merge([ticks], symbols=symbols)
>>> otp.run(ticks)
Time X SYMBOL_NAME
0 2003-12-01 00:00:00.000 1 S1
1 2003-12-01 00:00:00.000 -3 S2
2 2003-12-01 00:00:00.001 2 S1
3 2003-12-01 00:00:00.001 -2 S2
4 2003-12-01 00:00:00.002 3 S1
5 2003-12-01 00:00:00.002 -1 S2
```
#### get(name, dtype, default=None)
Get symbol parameter by name.
* **Parameters:**
* **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str)) -- The name of the symbol parameter to retrieve.
* **dtype** ([*type*](https://docs.python.org/3/library/functions.html#type)) -- The expected data type of the symbol parameter value.
* **default** (*Any* *,* *optional*) -- The default value to return if the symbol parameter is not found.
Default is `None`, which means that default value of dtype will be used.
* **Return type:**
[Operation](../operation/root.md#onetick.py.Operation)
### Examples
```pycon
>>> symbols = otp.Symbols('SOME_DB')
>>> symbols['PARAM'] = 'PAM'
>>> ticks = otp.DataSource('SOME_DB', tick_type='TT')
>>> ticks['SYMBOL_PARAM'] = ticks.Symbol.get(name='PARAM', dtype=str, default='default')
>>> ticks = otp.merge([ticks], symbols=symbols)
>>> otp.run(ticks)
Time X SYMBOL_PARAM
0 2003-12-01 00:00:00.000 1 PAM
1 2003-12-01 00:00:00.000 -3 PAM
2 2003-12-01 00:00:00.001 2 PAM
3 2003-12-01 00:00:00.001 -2 PAM
4 2003-12-01 00:00:00.002 3 PAM
5 2003-12-01 00:00:00.002 -1 PAM
```
```pycon
>>> symbol1 = otq.Symbol('SOME_DB::S1', params={'PARAM': 1})
>>> symbol2 = otq.Symbol('SOME_DB::S2')
>>> data = otp.DataSource(tick_type='TT')
>>> data['P'] = data.Symbol.get(name='PARAM', dtype=int, default=10)
>>> data = otp.merge([data], symbols=[symbol1, symbol2], identify_input_ts=True)
>>> otp.run(data)
Time P X SYMBOL_NAME TICK_TYPE
0 2003-12-01 00:00:00.000 1 1 SOME_DB::S1 TT
1 2003-12-01 00:00:00.000 10 -3 SOME_DB::S2 TT
2 2003-12-01 00:00:00.001 1 2 SOME_DB::S1 TT
3 2003-12-01 00:00:00.001 10 -2 SOME_DB::S2 TT
4 2003-12-01 00:00:00.002 1 3 SOME_DB::S1 TT
5 2003-12-01 00:00:00.002 10 -1 SOME_DB::S2 TT
```
#### \_\_getattr_\_(item)
Get symbol parameter by name. Notice, that symbol parameter type will be string.
#### Deprecated
Deprecated since version 1.74.0: Please, use `__getitem__()` method.
* **Return type:**
[\_SymbolParamColumn](../misc/symbol_param.md#onetick.py.core._source._symbol_param._SymbolParamColumn)
#### \_\_getitem_\_(item)
Get symbol parameter by name.
* **Parameters:**
**item** ([*tuple*](https://docs.python.org/3/library/stdtypes.html#tuple)) -- The first parameter is string - symbol parameter name. The second one is symbol parameter type.
* **Return type:**
[\_SymbolParamColumn](../misc/symbol_param.md#onetick.py.core._source._symbol_param._SymbolParamColumn)
### Examples
The second parameter is symbol parameter's type.
```pycon
>>> symbols = otp.Symbols('SOME_DB')
>>> symbols['PARAM'] = 5
>>> ticks = otp.DataSource('SOME_DB', tick_type='TT')
>>> ticks['SYMBOL_PARAM'] = ticks.Symbol['PARAM', int] + 1
>>> ticks['SYMBOL_PARAM'].dtype
>>> ticks = otp.merge([ticks], symbols=symbols)
>>> otp.run(ticks)
Time X SYMBOL_PARAM
0 2003-12-01 00:00:00.000 1 6
1 2003-12-01 00:00:00.000 -3 6
2 2003-12-01 00:00:00.001 2 6
3 2003-12-01 00:00:00.001 -2 6
4 2003-12-01 00:00:00.002 3 6
5 2003-12-01 00:00:00.002 -1 6
```
It also works with [`msectime`](../types/msectime.md#onetick.py.msectime) and [`nsectime`](../types/nsectime.md#onetick.py.nsectime) types:
```pycon
>>> symbols = otp.Symbols('SOME_DB')
>>> symbols['NSECTIME_PARAM'] = symbols['Time'] + otp.Nano(100)
>>> symbols['MSECTIME_PARAM'] = symbols['Time'] + otp.Milli(1)
>>> ticks = otp.DataSource('SOME_DB', tick_type='TT')
>>> ticks['NSECTIME_PARAM'] = ticks.Symbol['NSECTIME_PARAM', otp.nsectime] + otp.Nano(1)
>>> ticks['MSECTIME_PARAM'] = ticks.Symbol['MSECTIME_PARAM', otp.msectime] + otp.Milli(1)
>>> ticks['NSECTIME_PARAM'].dtype
>>> ticks['MSECTIME_PARAM'].dtype
>>> ticks = otp.merge([ticks], symbols=symbols)
>>> otp.run(ticks)
Time X NSECTIME_PARAM MSECTIME_PARAM
0 2003-12-01 00:00:00.000 1 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
1 2003-12-01 00:00:00.000 -3 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
2 2003-12-01 00:00:00.001 2 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
3 2003-12-01 00:00:00.001 -2 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
4 2003-12-01 00:00:00.002 3 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
5 2003-12-01 00:00:00.002 -1 2003-12-01 00:00:00.000000101 2003-12-01 00:00:00.002
```