# ntt-command-service
Library for implementing Command Pattern
## Examples
```python
from ntt_command_service import *
from typing import List
fScores: List[float] = []
class AppendDataCommand(ICommand):
def __init__(self, fScores: List[float], fScore: float):
self._fScores = fScores
self._fScore = fScore
def Execute(self) -> None:
self._fScores.append(self._fScore)
def CanExecute(self) -> bool:
return True
def Undo(self) -> None:
self._fScore.pop()
serCommandService = CommandService()
serCommandService.AddCommand(AppendDataCommand(fScores, 3))
# ----> fScores = [3]
serCommandService.AddCommand(AppendDataCommand(fScores, 5))
# ----> fScores = [3, 5]
serCommandService.AddCommand(AppendDataCommand(fScores, 1))
# ----> fScores = [3, 5, 1]
serCommandService.Undo()
# ----> fScores = [3, 5]
serCommandService.Clear()
serCommandService.CanUndo()
# ----> False
```
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