Error pyttsx3.init ('sapi5') in Python

I'm having a question in Python, I'm trying to use the pyttsx3 library, with python3.6. And when I run the pyttsx3.init('sapi5') boot command an error appears, and I can not start the library.

follows the ERROR:

================== RESTART: C:\Users\User\Documents\bot.py ==================
    Traceback (most recent call last):
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyttsx3\__init__.py", line 44, in init
        eng = _activeEngines[driverName]
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\weakref.py", line 137, in __getitem__
        o = self.data[key]()
    KeyError: 'sapi5'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "C:\Users\User\Documents\bot.py", line 15, in <module>
        speak = pyttsx3.init('sapi5') # 'sapi5'
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyttsx3\__init__.py", line 46, in init
        eng = Engine(driverName, debug)
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyttsx3\engine.py", line 52, in __init__
        self.proxy = driver.DriverProxy(weakref.proxy(self), driverName, debug)
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyttsx3\driver.py", line 75, in __init__
        self._module = importlib.import_module(name)
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\importlib\__init__.py", line 126, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)
      File "<frozen importlib._bootstrap>", line 994, in _gcd_import
      File "<frozen importlib._bootstrap>", line 971, in _find_and_load
      File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
      File "<frozen importlib._bootstrap_external>", line 678, in exec_module
      File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
      File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pyttsx3\drivers\sapi5.py", line 3, in <module>
        import win32com.client
    ModuleNotFoundError: No module named 'win32com'