AttributeError: module 'comtypes.gen.UIAutomationClient' has no attribute 'CUIAutomation

Expected Behavior

When running a script with a very single line such as from pywinauto import Application or import pywinauto, I should not get any error message.

Actual Behavior

I do get error messages: D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\__init__.py:72: UserWarning: Apply externally defined coinit_flags: 0 .format(module_sys.coinit_flags), UserWarning) Traceback (most recent call last): File "<input>", line 1, in <module> File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2018.1\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 20, in do_import module = self._system_import(name, *args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\__init__.py", line 89, in <module> from . import findwindows File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2018.1\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 20, in do_import module = self._system_import(name, *args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\findwindows.py", line 42, in <module> from . import controls File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2018.1\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 20, in do_import module = self._system_import(name, *args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\controls\__init__.py", line 36, in <module> from . import uiawrapper # register "uia" back-end (at the end of uiawrapper module) File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2018.1\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 20, in do_import module = self._system_import(name, *args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\controls\uiawrapper.py", line 47, in <module> from ..uia_defines import IUIA File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2018.1\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 20, in do_import module = self._system_import(name, *args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\uia_defines.py", line 181, in <module> pattern_ids = _build_pattern_ids_dic() File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\uia_defines.py", line 169, in _build_pattern_ids_dic if hasattr(IUIA().ui_automation_client, cls_name): File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\uia_defines.py", line 50, in __call__ cls._instances[cls] = super(_Singleton, cls).__call__(*args, **kwargs) File "D:\PycharmProjects\project_a\venv\lib\site-packages\pywinauto\uia_defines.py", line 63, in __init__ self.ui_automation_client.CUIAutomation().IPersist_GetClassID(), **AttributeError: module 'comtypes.gen.UIAutomationClient' has no attribute 'CUIAutomation**'

I found kind of similar issue described there: https://github.com/pywinauto/pywinauto/issues/513

But reinstalling comtypes==1.1.5 didnt change anything. Currently, I do have comtypes==1.1.7 installed. To be accurate, when I forced the installation of comtypes==1.1.5, it failed, and rolled back to 1.1.7.

pywinauto was installed without any issue.

In my venv there is also: pywin32==228 pywinauto==0.6.8 win32core==221.36 win32gui==221.6

Steps to Reproduce the Problem

Short Example of Code to Demonstrate the Problem

pip install pywinauto, #no issue from pywinauto import Application # it fails import pywinauto # it fails as well.

Specifications

• Pywinauto version: 0.6.8
• Python version and bitness: Python 3.6
• Platform and OS: Windows 7

I’m clueless regarding the cause of this issue.

[eshraj302]

I was having the same problem when using Python 3.8.5, just changed the python version to 3.8.3, that solved the problem for me!, Try this out and let me know

[x1nas]

Есть две виртуалки с pywinauto. Состав и версии python пакетов идентичны.

Python 3.8.10. pywinauto 0.6.8 comtypes 1.1.11 pywin32 304 six 1.16.0

В одном случае возникает ошибка

AttributeError: module 'comtypes.gen.UIAutomationClient' has no attribute 'CUIAutomation'

В другом - такой ошибки не возникает и все работает.

В тикетах никакого решения не нашел.

Прощу прощения - просмотрел команду по очистке кэша https://github.com/pywinauto/pywinauto/issues/513#issuecomment-411556088 .

В моем случае команда выглядела следующим образом (Powershell от Администратора):

& 'C:\Program Files\Python38\python.exe' 'C:\Program Files\Python38\Scripts\clear_comtypes_cache.py' -y

После выполнения команды - проблема перестала возникать. Перезагрузка ОС не требуется, достаточно перезапустить Python.