如何在python的无限循环中每X次只调用一次函数？

Question

我有一个 Python 程序，其中包含在 while 循环中调用的许多函数。

我需要我的 while 循环在第一次执行循环时调用所有函数，但随后我只想每两分钟调用一次这些函数中的一个。

这是一个代码示例：

def dostuff():
    print('I\'m doing stuff!')
def dosthings():
    print('I\'m doing things!')
def dosomething():
    print('I\'m doing something!')

if __name__ == '__main__':
    while True:
        dostuff()
        print('I did stuff')
        dosthings()
        print('I did things')  #this should run once every X seconds, not on all loops
        dosomething()
        print('I did something')

我怎样才能达到这个结果？ 我必须使用多线程/多处理吗？

Answer 1

这里有一个快速和肮脏的单线程的演示，使用time.perf_counter()您也可以使用time.process_time()如果你不希望包括在睡眠中度过的时间：

import time


# Changed the quoting to be cleaner.
def dostuff():
    print("I'm doing stuff!")

def dosthings():
    print("I'm doing things!")

def dosomething():
    print("I'm doing something!")


if __name__ == '__main__':
    x = 5
    clock = -x  # So that (time.perf_counter() >= clock + x) on the first round

    while True:
        dostuff()
        print('I did stuff')

        if time.perf_counter() >= clock + x:
            # Runs once every `x` seconds.
            dosthings()
            print('I did things')
            clock = time.perf_counter()

        dosomething()
        print('I did something')

        time.sleep(1)  # Just to see the execution clearly.

现场观看