What I want:

A dictionary that looks something like "SIG":"SIG1,SIG2,SIG3,...,SIG205,SIG206". It's currently called "output_buffers". The things I'm trying to add to it are devices. Each subsystem key has lots of devices.

My current thing that writes to it:

output_buffers[subsystem].append(device)

I do this every time I want to write a new device to the buffer for that particular subsystem.

Do I have to initialise the dictionary explicitly beforehand?

Edit: The language is Python.