What is the difference between win32com.client and pythoncom?

Before that, we need to learn and understand a little about COM, OLE, and ACTIVEX.

Pythoncom is a module that collects the utility functions needed to use the win32com package.

I think CoInitialize, PumpWaitingMessages are the most commonly used functions

When using COM in a thread, it must be the pythoncom CoInitialize function, and PumpWaitingMessages is used to wait for messages.

The key point is that understanding COM is essential to properly use win32com.