subprocess应用验证与建立模板

位置：F:/pyqt_practice/test_one_shot_training_multi_region_py/code/testprocess.py
注：usetotest.py 与testprocess.py 文件的相对位置是，两者处于同一个文件夹中。

usetotest.py

import argparse
import datetime

parser = argparse.ArgumentParser(formatter_class = argparse.ArgumentDefaultsHelpFormatter)

parser.add_argument(
	'--your_name',
	default = 'datou',
	help='please input your name')

args = parser.parse_args()

print("your name is :",args.your_name)
print("{} is end!".format(args.your_name))
print("{} the end time is :{}".format(args.your_name,datetime.datetime.now()))

用testprocess.py去进行验证

caseone

import subprocess
import shlex


name_list = ['one','two','three','four','five','six']
for name in name_list:
    print("starting to process the ",name)
    command = 'python usetotest.py --your_name={}'.format(name)
    p = subprocess.Popen(command)
    print("surface~~")
    print("surface--")
    print()
    # p.wait()

command2 = 'python usetotest.py --your_name=haha'
p2 = subprocess.Popen(command2)
#p2.wait()
print("whether p2 has teminated?:",p2.poll())
print("the main program ends")

输出

casetwo

import subprocess
import shlex


name_list = ['one','two','three','four','five','six']
for name in name_list:
    print("starting to process the ",name)
    command = 'python usetotest.py --your_name={}'.format(name)
    p = subprocess.Popen(command)
    print("surface~~")
    print("surface--")
    print()
    # p.wait()

command2 = 'python usetotest.py --your_name=haha'
p2 = subprocess.Popen(command2)
p2.wait()
print("whether p2 has teminated?:",p2.poll())
print("the main program ends")

casetwo输出

casethree

import subprocess
import shlex


command2 = 'python usetotest.py --your_name=haha'
p2 = subprocess.Popen(command2)
p2.wait()
print("whether p2 has teminated?:",p2.poll())


name_list = ['one','two','three','four','five','six']
for name in name_list:
    print("starting to process the ",name)
    command = 'python usetotest.py --your_name={}'.format(name)
    p = subprocess.Popen(command)
    print("surface~~")
    print("surface--")
    print()
    # p.wait()


print("the main program ends")

casethree输出

casefour

import subprocess
import shlex


command2 = 'python usetotest.py --your_name=haha'
p2 = subprocess.Popen(command2)
p2.wait()
print("whether p2 has teminated?:",p2.poll())


name_list = ['one','two','three','four','five','six']
for name in name_list:
    print("starting to process the ",name)
    command = 'python usetotest.py --your_name={}'.format(name)
    p = subprocess.Popen(command)
    print("surface~~")
    print("surface--")
    print()
    p.wait()


print("the main program ends")

输出

casefive

import subprocess
import shlex

name_list = ['one','two','three','four','five','six']
for name in name_list:
    print("starting to process the ",name)
    command = 'python usetotest.py --your_name={}'.format(name)
    p = subprocess.Popen(command)

    print("surface~~")
    print("surface--")
    p.wait()
    print()

command2 = 'python usetotest.py --your_name=haha'
p2 = subprocess.Popen(command2)
p2.wait()
print("whether p2 has teminated?:",p2.poll())

print("the main program ends")

输出

综上所述：

p = subprocess.Popen(arg) arg可以是一个字符串去代表命令：caseone casetwo casethree casefout
也可以是一个字符串列表 case five
p2.poll() 若执行完成返回0， 没有执行完成，返回None

1. caseone：代码位置： 前循后主
   for 循环没有p.wait()+后半段主程序中没有wait()，所有的child process没没有执行完成
2. casetwo: 代码位置：前循后主p
   for 循环没有p.wait()+后半段主程序中有wait(),所有的child process 都执行完成 first：for 循环child process 无序完成+second 主程序后半段child process 完成
3. casethree：代码位置：前主p后循
   for循环在主程序后半段+没有p.wait() ，for循环执行阶段 其child process 没有执行完成，主程序时执行部分结束。 前半段主程序+p.wait 其child process执行完成
   4.casefour：代码位置： 前主p后循p child process按代码循序完成
   5.casefive: 代码位置：前循p后主p child process按代码顺序完成

所以运用subprocess 去执行程序的话，可以使用casefour 或者是casefive 作为参考的框架，保证程序按代码顺序执行
如果不想按照代码位置顺序执行，可以参考casetwo 。