Question

说我是否有以下四个功能：

def foo():
    subprocess.Popen('start /B someprogramA.exe', shell=True)

def bar():
    subprocess.Popen('start /B someprogramB.exe', shell=True)

def foo_kill():
    subprocess.Popen('taskkill /IM someprogramA.exe')

def bar_kill():
    subprocess.Popen('taskkill /IM someprogramB.exe')

我怎样才能将foo和bar函数交替运行，比如30分钟？含义：第一个30分钟 - 运行foo，第二个30分钟 - 运行bar，第三个30分钟 - 运行foo，依此类推。每次新的运行应该“杀死”前一个thread / func。

我有一个倒数计时器线程，但不知道如何“替换”这些功能。

class Timer(threading.Thread):
    def __init__(self, minutes):
        self.runTime = minutes
        threading.Thread.__init__(self)


class CountDownTimer(Timer):
    def run(self):
        counter = self.runTime
        for sec in range(self.runTime):
            #do something           
            time.sleep(60) #editted from 1800 to 60 - sleeps for a minute
            counter -= 1

timeout=30
c=CountDownTimer(timeout)
c.start()

编辑：我的解决方案是Nicholas Knight的投入......

import threading
import subprocess
import time

timeout=2 #alternate delay gap in minutes

def foo():
    subprocess.Popen('start /B notepad.exe', shell=True)

def bar():
    subprocess.Popen('start /B calc.exe', shell=True)

def foo_kill():
    subprocess.Popen('taskkill /IM notepad.exe')

def bar_kill():
    subprocess.Popen('taskkill /IM calc.exe')


class Alternator(threading.Thread):
    def __init__(self, timeout):
        self.delay_mins = timeout 
        self.functions = [(foo, foo_kill), (bar, bar_kill)]
        threading.Thread.__init__(self)

    def run(self):
        while True:
            for f, kf in self.functions:
                f()
                time.sleep(self.delay_mins*60)
                kf()

a=Alternator(timeout)
a.start()

工作正常。

Answer 1

请记住，函数是Python中的第一类对象。这意味着您可以将它们存储在变量和容器中！一种方法是：

funcs = [(foo, foo_kill), (bar, bar_kill)]

def run(self):
    counter = self.runTime
    for sec in range(self.runTime):
        runner, killer = funcs[counter % 2]    # the index alternates between 0 and 1
        runner()    # do something
        time.sleep(1800)
        killer()    # kill something
        counter -= 1

Answer 2

你过度复杂了。

while True:
    foo()
    time.sleep(1800)
    foo_kill()
    bar()
    time.sleep(1800)
    bar_kill()

或者如果您想稍后轻松添加更多功能：

functions = [(foo, foo_kill), (bar, bar_kill), ] # Just append more as needed
while True:
    for f, kf in functions:
        f()
        time.sleep(1800)
        kf()

Answer 3

使用变量记录上次运行的功能。当计时器触发时，运行另一个函数并更新变量。

Answer 4

import itertools, time

# make sure the function are in the order you want to run them in
# and grouped by the ones that you want to run together
funcs = ((bar_kill, foo), (foo_kill, foo)) 

for func_killer, func in itertools.cycle(funcs)
    func_killer()
    func()
    time.sleep(30 * 60) # pause for 30 minutes

函数可以存储在python中的列表中，您可以使用for循环迭代它们。

itertools是一个操纵可迭代的模块，例如列表。在这里，我们使用cycle创建一个无限循环，它将一遍又一遍地处理列表funcs中的函数。

Python：每隔x分钟交替执行一次功能

4 个答案: