开发使用python

时间:2018-10-11 20:44:12

标签: python

我有一个python脚本,它调用另一个python文件并运行它。但是,我需要该脚本多次并行运行同一文件。我将在这里共享代码片段。这将运行一次python文件。

output = os.popen('python py_generator_sm20.py' + options)
print output.read()

如何并行化它以同时运行多次?

2 个答案:

答案 0 :(得分:0)

由于代码的output部分,这可能无法完全回答您,但可能是一个起点。使用multiprocessing模块,您可以创建一个池数量的工作人员,然后使用subprocess模块可以为每个工作人员和check the output调用脚本的一个实例:

import multiprocessing as mp
import subprocess as sp

# an example with two runs
commands = ['python test.py', 'python test.py']
# pass the number of threads that will be working
# if the number of threads < len(commands) the exceed 
# will run in sequence when some process terminate
pool = mp.Pool(processes=2)
# execute the script calls
res = pool.map(sp.check_output, commands)
print(*[item.decode() for item in res])
pool.close()

注意:check_output的返回值是byte string,因此您需要将其转换回string

我使用以下简单程序对其进行了测试:

import time

if __name__ == "__main__":

    print("Running an instance at {}".format(time.ctime()))
    time.sleep(2)
    print("Finished at {}".format(time.ctime()))

这就是输出:

Running an instance at Thu Oct 11 23:21:44 2018
Finished at Thu Oct 11 23:21:46 2018
Running an instance at Thu Oct 11 23:21:44 2018
Finished at Thu Oct 11 23:21:46 2018

您可以看到它们同时运行。

答案 1 :(得分:0)

我认为您需要这个:

from multiprocessing.dummy import Pool as ThreadPool 
pt = ThreadPool(4) 
results = pt.map(pt_function, pt_array)

或者也许是这种方式(如果您有很多线程脚本):

from Threading_orders import Thread
class First_time(Thread):
    """
    A threading example
    """    
    def __init__(self, a, b):
        """Инициализация потока"""
        Thread.__init__(self)
        self.a = a
        self.b = b
    def run(self):
        MyThread_1(self.a, self.b)
        MyThread_2(self.a, self.b)
        MyThread_3(self.a, self.b)