（Python）名称'curr'未定义[关闭]

Question

@socketio.on('disconnect')
def disconnect_details():
    for room_num in room_users_counter:
        curr = 0
        expected_num = room_users_counter[room_num]
        emit(f"{room_num}$attendance", broadcast=True, include_self=False)
        @socketio.on("here")
        def here(_room_num):
            global curr
         
            if _room_num == room_num:
                curr +=1

错误：

line 246, in here
    curr +=1
NameError: name 'curr' is not defined

当我在顶部说curr = 0 定义时，我不知道为什么它未定义

Answer 1

您需要nonlocal，而不是global，因为curr 是局部变量（disconnect_details 的局部变量），而不是全局变量。

def here(_room_num):
    nonlocal curr
     
    if _room_num == room_num:
        curr += 1