Scope of boolean variable-CodePudding

The following code producing - UnboundLocalError: local variable 'ws_is_connected' referenced before assignment:

import threading

ws_is_connected=False
def timer_ws():
    threading.Timer(22.0, timer_ws).start()
    if not ws_is_connected:
        print("Alarm")
        ws_is_connected=False
    print("22 seconds")
    
timer_ws()

For some reason a Python thinks that this variable a local, but it was declared globally on top. I am newbie in Python, so maybe doing something wrong.

The reason the ws_is_connected settled lower is a websocket client ping-pong check. I need to reset this variable every 22 seconds in order to make sure that ws connection is alive:

def on_pong(ws, message):
    print("Got a pong! No need to respond")
    ws_is_connected=True

Cause on_pong function repeats every 10 seconds.

I am looking for some way to modify a code so it will work or use another approach and rewrite code.

CodePudding user response：

You can make the function use the global variable as well. Just before calling the variable in the function, add global var_name and it should work fine like this:

def timer_ws():
    threading.Timer(22.0, timer_ws).start()
    global ws_is_connected
    if not ws_is_connected: