session.Process of the System Sounds process value is None.

[Rehi146]

An example:
sessions = AudioUtilities.GetAllSessions()
print(get_time() + "Audio device volume is set to max, Setting processes volume:")
for session in sessions:
interface = session.SimpleAudioVolume
if interface.GetMasterVolume() <= 0.99:
interface.SetMasterVolume(interface.GetMasterVolume() + 0.01, None)
name = "Can't get process name: "
if session.Process: # If it's not None, otherwise session.Process.name() would crash the program
name = session.Process.name()
print(name + ": volume changed to " + str(int(interface.GetMasterVolume() * 100)) + "%")

[Rehi146]

Maybe there are more processes like this. Better check it out.

[TurboAnonym]

... a bit late, but this is only true for the System Sounds. 😇

It is caused by session._ctl.GetProcessId() == 0 for the System Sounds. (see pycaw.utils AudioSession)

[TJ-59]

Btw, a session's ._ctl.IsSystemSoundsSession() return 1 for everything except for the actual "system sounds" session, which returns a 0.
Shouldn't it be the opposite ? or changing it now would cause some code to behave badly ?