Check Windows input message queue idle in Python

Code below shows how to check for message queue input idle. Note that WaitForInputIdle waits only once per process on any thread. So if one of the thread returns idle then it will return right away. 

Tested on:
Windows 10 TH2 (build 1511)
Python 3.5.1 64-bit

Also need to install pywin32, like:

c:\> pip install pypiwin32

This should be run on elevated prompt.