1.用python调用python脚本

#!/usr/local/bin/python3.7
import time
import os 

count = 0
str = ('python b.py')
result1 = os.system(str)
print(result1)
while True:
    count = count + 1
    if count == 8:
      print('this count is:',count) 
      break
    else:
      time.sleep(1)
      print('this count is:',count)   

print('Good Bye')

另外一个python脚本b.py如下：

#!/usr/local/bin/python3.7
print('hello world')

运行结果：

[python@master2 while]$ python a.py 
hello world
this count is: 1
this count is: 2
this count is: 3
this count is: 4
this count is: 5
this count is: 6
this count is: 7
this count is: 8
Good Bye

2.python调用shell方法os.system()

#!/usr/local/bin/python3.7
import time
import os 

count = 0
n = os.system('sh b.sh')
while True:
    count = count + 1
    if count == 8:
      print('this count is:',count) 
      break
    else:
      time.sleep(1)
      print('this count is:',count)   

print('Good Bye')

shell脚本如下：

#!/bin/sh
echo "hello world"

运行结果：

[python@master2 while]$ python a.py 
hello world
this count is: 1
this count is: 2
this count is: 3
this count is: 4
this count is: 5
this count is: 6
this count is: 7
this count is: 8
Good Bye

3.python调用shell方法os.popen()

#!/usr/local/bin/python3.7
import time
import os 

count = 0
n = os.system('sh b.sh')
while True:
    count = count + 1
    if count == 8:
      print('this count is:',count) 
      break
    else:
      time.sleep(1)
      print('this count is:',count)   

print('Good Bye')

运行结果：

[python@master2 while]$ python a.py 
<os._wrap_close object at 0x7f7f89377940>
['hello world\n']
this count is: 1
this count is: 2
this count is: 3
this count is: 4
this count is: 5
this count is: 6
this count is: 7
this count is: 8
Good Bye

os.system.popen() 这个方法会打开一个管道，返回结果是一个连接管道的文件对象，该文件对象的操作方法同open()，可以从该文件对象中读取返回结果。如果执行成功，不会返回状态码，如果执行失败，则会将错误信息输出到stdout，并返回一个空字符串。这里官方也表示subprocess模块已经实现了更为强大的subprocess.Popen()方法。