将run()的绑定/管道输出打开/插入到python3(lynux)函数中 [英] Binding / piping output of run() on/into function in python3 (lynux)

问题描述

我正在尝试使用通过 run 函数运行的外部程序的输出. 该程序定期抛出一行数据，我需要在我的脚本中使用 我找到了一个 subprocess 库，并使用了它的run()/check_output()

示例:
def usual_process(): # some code here for i in subprocess.check_output(['foo','$$']): some_function(i)

I am trying to use output of external program run using the run function. this program regularly throws a row of data which i need to use in mine script I have found a subprocess library and used its run()/check_output()

Example:
def usual_process(): # some code here for i in subprocess.check_output(['foo','$$']): some_function(i)

现在假设foo已经在PATH变量中，并且它会在半随机周期内输出一个字符串.
我希望程序做自己的事情，并且每次foo将新行发送到其输出时都运行some_function(i).

Now assuming that foo is already in a PATH variable and it outputs a string in semi-random periods.
I want the program to do its own things, and run some_function(i)every time foo sends new row to its output.

有两个问题.将输出传递到for循环中并将其作为后台子进程运行 谢谢

which boiles to two problems. piping the output into a for loop and running this as a background subprocess Thank you

更新:我已经设法使用

Update: I have managed to get the foo output onto some_function using This

with os.popen('foo') as foos_output:
    for line in foos_output:
        some_function(line)

根据此 os.popen 是不推荐使用的，但是我还没有弄清楚如何在python中传递内部进程 现在只需要弄清楚如何在后台运行此功能

According to this os.popen is to be deprecated, but I am yet to figure out how to pipe internal processes in python Now just need to figure out how to run this function in a background

推荐答案

SO，我已经解决了. 第一步是启动外部脚本:
proc=Popen('./cisla.sh', stdout=PIPE, bufsize=1)

SO, I have solved it. First step was to start the external script:
proc=Popen('./cisla.sh', stdout=PIPE, bufsize=1)

接下来，我启动了一个函数，该函数将读取它并将其传递给管道

Next I have started a function that would read it and passed it a pipe

def foo(proc, **args):
       for i in proc.stdout:
         '''Do all I want to do with each'''

foo(proc).start()`

限制是: 如果您不希望捕获脚本错误，则必须将其插入.
其次是如果您杀死父母会留下僵尸，所以不要忘记在信号处理中杀死孩子

Limitations are: If your wish t catch scripts error you would have to pipe it in.
second is that it leaves a zombie if you kill parrent SO dont forget to kill child in signal-handling

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