需要检查事件是否已经发生然后退出（无休止的）循环但程序必须运行连续

Question

我正在尝试在 Python 中编写一个小程序来搜索网页上 table 中的某些特定值。最终我可以使用一个名为 Alert_Red 的函数获取值。我需要每 5 秒自动调用一次该函数，但是当我尝试下面的代码时，它会给我正确的值，但在无限循环中。

[...some code above...]

def Alert_Red():
    if advColor == avc_red and delta <= fivesec_datetime:
        print('New RED advisory please check the following link: ', link)
        if advColor1 == avc_red and adv_datetime1 == adv_datetime:
            print('Another new RED advisory please check the following link: ', link)

schedule.every(5).seconds.do(Alert_Red)

while True:
    schedule.run_pending()
    time.sleep(1)

第一个“if 子句”为 true 的输出：

New RED advisory please check the following link: , link
New RED advisory please check the following link: , link
New RED advisory please check the following link: , link
[endless loop every 5 sec]

第二个“if 子句”为真时的输出：

Another new RED advisory please check the following link: , link
Another new RED advisory please check the following link: , link
Another new RED advisory please check the following link: , link
[endless loop every 5 sec]

程序必须运行连续（即使 if 子句为真，因为我需要始终检查它们）但我只需要被告知一次（第一次找到值 and/or 如果他们改变了），我需要的输出是：

New RED advisory please check the following link: ', link

或第二个“if 子句”为真：

Another new RED advisory please check the following link: ', link

Answer 1

如果我理解你的问题，它可以通过跟踪你是否发布了咨询的全局变量来解决。在此函数之外（在您的启动代码中的某处）将此变量初始化为 False。

def Alert_Red():
    global advised
    if advColor == avc_red and delta <= fivesec_datetime:
        if not advised:
            print('New RED advisory please check the following link:', link)
            advised = True
        if advColor1 == avc_red and adv_datetime1 == adv_datetime:
            if not advised:
                print('Another new RED advisory please check the following link: ', link)               
                advised = True

需要检查事件是否已经发生然后退出（无休止的）循环但程序必须运行连续

Need to check if an event is already happened then exit the (endless) loop but the program must run continously

python

loops

schedule

if-statement

function

需要检查事件是否已经发生然后退出（无休止的）循环但程序必须 运行 连续

Need to check if an event is already happened then exit the (endless) loop but the program must run continously

python

loops

schedule

if-statement

function

需要检查事件是否已经发生然后退出（无休止的）循环但程序必须运行连续