[Twisted-Python] What is the difference in between reactor.running and reactor._stopped

[Gabriel Rossetti]

Hello,

I tried using reactor.running for a test, to not try to stop the reactor 
if it's already stopped, but it doesn't work. If I use reactor._stopped 
instead, it works. I know I'm not supposed to access it sonce it is 
prefixed by the underscore, so my question is what is the difference in 
between reactor.running and reactor._stopped, and why does 
reactor.running not work as I expect (not reactor.running == 
reactor._stopped)?

Thank you, Gabriel