@Maximus5 I mean idle which comes with python, it's a gui for the command-line version of python (I actually use ipython + jupyter but I think this is easier for testing). You can run idle using "C:\Program Files\Python35\pythonw.exe" "C:\Progra~1\Python35\Lib\idlelib\idle.pyw".
Under idle the subprocess commands can be run which pops up a console window not caught by conemu:
That happens because of python's Idle architecture crazyness.
The window "Python 3.4.x Shell" is created within one pythonw.exe, which is hooked by DefTerm properly, but command (python.exe) is executed within childpythonw.exe process, which is not hooked, obviously, because it has no GUI window!