Strange "None" key

[yuyou]

My code ran into this line and exception throws ""KeyError: None"".

python-socketio/src/socketio/base_manager.py

Line 120 in a813bde

eio_sid = self.rooms[namespace][None][sid]

Could someone help explaining why using "None" as the key?

[miguelgrinberg]

What do you need to know? You are looking at an internal structure maintained by this package. The None there is correct.