[Python] mac python , how to active an subprocess window

I'm trying to activate a subprocess window by python. First of all , run an app , click a button, then popup a new window (sub-processed). Using python to find the window by title, and activate it.

from AppKit import NSWorkspace
from Quartz import (CGWindowListCopyWindowInfo, kCGWindowListOptionOnScreenOnly, kCGNullWindowID)
from Cocoa import NSApplicationActivateIgnoringOtherApps


print('--- running applications ---')
runningApps = NSWorkspace.sharedWorkspace().runningApplications()
for app in runningApps:
print(app)

wndList = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID)
# print('----------> wndList')
for wnd in wndList:
# print(wnd)
if wnd["kCGWindowName"] == "some title":
print('--- found ---')
print(wnd)
# ---------here, how to activate the window?
# follow code doesn't work, it's just active the main process app, not the subprocess window
# app.unhide()
# app.activateWithOptions_(NSApplicationActivateIgnoringOtherApps)
break


using pstree tool can get

-+= 00001 root /sbin/launchd
\-+= 06960 /Applications/WeChat.app/Contents/MacOS/WeChat
\-+- 06961 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app/C
|--- 06964 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 06965 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 06967 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 06969 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 07085 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 12312 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
|--- 26736 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app
\--- 29628 /Applications/WeChat.app/Contents/MacOS/WeChatAppEx.app


The main process id is 06960 and the window's process id is 26736

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