Checking wx or qt is running in gui __init__.py

Coding
1

In the gui init file, please can someone explain how

if wx.GetApp() is None:

is checking if wx is NOT running?

Surely if wx was not running then there would be an error, and if it is running then wx.GetApp() would indeed return None?

2

slight update to my question…

If I run:

import wx
print wx.GetApp() is None

in cmd I get True, but in PsychoPy shell I get False? Tried looking up wx literature but still don’t understand.