在运行python脚本时，增加执行python脚本后的睡眠时间

Question

我有一个简单的python代码。它做了一件事，睡了x秒，又做了另一件事。我想在执行文件后延长睡眠时间。你知道吗

例如

print("A")
time.sleep(x)
print("B")

在执行代码之后，我想在打印B之前更改并增加睡眠时间

有可能吗？请帮忙。谢谢。你知道吗

Answer 1

#!/usr/bin/env python

import time

try:
    with open(".sleeptime") as f:
        sleep_time = float(f.read())
except FileNotFoundError:
    sleep_time = 5.0

with open(".sleeptime", "w") as f:
    next_sleep_time = sleep_time + 5.0
    f.write(str(next_sleep_time))

print("A")
time.sleep(sleep_time)
print("B")

Answer 2

这个解决方案是使用一个包含睡眠时间的列表，您可以通过在目标函数处于睡眠状态时附加更多的睡眠来扩展该列表。函数sleep_all弹出并执行该列表中的所有可用睡眠。你知道吗

import time
from datetime import datetime
from threading import Thread, current_thread


def f():
    print(f'{datetime.now()}: A')
    sleep_all()
    print(f'{datetime.now()}: B')


def sleep_all():
    sleeps = current_thread().sleeps
    while sleeps:
        sleep = sleeps.pop()
        print(f'{datetime.now()}: taking a nap for {sleep} s')
        time.sleep(sleep)


if __name__ == '__main__':


    t = Thread(target=f)
    t.sleeps = [5]  # attach instance attribute with sleeps-list
    t.start()
    time.sleep(2)
    print(f'{datetime.now()}: adding another sleep')
    t.sleeps.append(5)

输出示例：

2018-12-07 22:54:09.733494: A
2018-12-07 22:54:09.733553: taking a nap for 5 s
2018-12-07 22:54:11.735635: adding another sleep
2018-12-07 22:54:14.734963: taking a nap for 5 s
2018-12-07 22:54:19.738833: B

Process finished with exit code 0

具有子类Thread的版本：

import time
from datetime import datetime
from threading import Thread


class Program(Thread):

    def __init__(self, sleep=None):
        super().__init__()
        self._sleeps = [sleep]

    def run(self):
        print(f'{datetime.now()}: A')
        self._sleep_all()
        print(f'{datetime.now()}: B')

    def add_sleep(self, sleep):
        self._sleeps.append(sleep)

    def _sleep_all(self):
        while self._sleeps:
            sleep = self._sleeps.pop()
            print(f'{datetime.now()}: taking a nap for {sleep} s')
            time.sleep(sleep)


if __name__ == '__main__':

    prg = Program(sleep=5)
    prg.start()
    time.sleep(2)
    print(f'{datetime.now()}: adding another sleep')
    prg.add_sleep(sleep=5)
    prg.join()