[英]Launch process in background and retrieve output
我想在后台啟動Flask應用程序的實例,以便我可以對它運行webdriver測試。 為此我需要捕獲&
命令的輸出,這樣我就可以在測試結束時終止進程。
我已經嘗試過subprocess.call()
和subprocess.check_output()
但是我無法捕獲第一個進程號或后者進程與另一個進程號。 我還能嘗試什么?
你可以和Popen一起使用nohup:
from subprocess import Popen, check_call
from os import devnull
p = Popen(["nohup", "python", "test.py"], stdout=open(devnull, "w"))
import time
print(p.pid)
for i in range(3):
print("In for")
time.sleep(1)
check_call("ps -ef | grep {} | grep -v grep".format(p.pid), shell=True)
p.terminate()
check_call("ps -ef | grep {} | grep -v grep".format(p.pid), shell=True)
test.py:
import time
while True:
time.sleep(1)
print("Still alive")
輸出:
In [3]: from os import devnull
In [4]: p = Popen(["nohup", "python", "b.py"], stdout=open(devnull, "w"))
nohup: ignoring input and redirecting stderr to stdout
In [5]: print(p.pid)
28332
In [6]: for i in range(3):
...: print("In for")
...: time.sleep(1)
...:
In for
In for
In for
In [7]: check_call("ps -ef | grep {} | grep -v grep".format(p.pid), shell=True)
padraic 28332 28301 1 20:55 pts/8 00:00:00 python test.py
Out[7]: 0
In [8]: p.terminate()
In [9]: check_call("ps -ef | grep {} | grep -v grep".format(p.pid), shell=True)
padraic 28332 28301 0 20:55 pts/8 00:00:00 [python] <defunct>
Out[9]: 0
您可能需要查看Flask-Testing庫,它支持運行燒瓶服務器,因此您可以對其進行selenium測試。
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