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5 changes: 3 additions & 2 deletions pyttsx3/engine.py
Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
from __future__ import annotations
from typing import Literal

import sys
import traceback
Expand Down Expand Up @@ -165,7 +166,7 @@ def isBusy(self) -> bool:
"""
return self.proxy.isBusy()

def getProperty(self, name: str) -> object:
def getProperty(self, name: Literal['voices', 'voice', 'rate', 'volume']) -> object:
"""
Gets the current value of a property. Valid names and values include:

Expand All @@ -186,7 +187,7 @@ def getProperty(self, name: str) -> object:
assert name
return self.proxy.getProperty(name)

def setProperty(self, name: str, value: str | float) -> None:
def setProperty(self, name: Literal['voice', 'rate', 'volume'], value: str | float) -> None:
"""
Adds a property value to set to the event queue. Valid names and values
include:
Expand Down
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