>>> subprocess.call(["ls", "-l"])
0
>>> subprocess.call("exit 1", shell=True)
1

x=subprocess.check_output(["echo", "Hello World!"],shell=True)
print(x)
"Hello World!"

y=subprocess.check_output(["type", "app2.cpp"],shell=True)
print(y) 
#include <iostream>   
using namespace std;  
...... 

handle = open(r'd:\tmp.log','wt')
subprocess.Popen(['ipconfig','-all'], stdout=handle)

output = subprocess.Popen(['ipconfig','-all'], stdout=subprocess.PIPE,shell=True)
oc=output.communicate()#取出output中的字符串
#communicate() returns a tuple (stdoutdata, stderrdata).
print(oc[0]) #打印网络信息
Windows IP Configuration
    Host Name . . . . .

child1 = subprocess.Popen(["dir","/w"], stdout=subprocess.PIPE,shell=True)
child2 = subprocess.Popen(["wc"], stdin=child1.stdout,stdout=subprocess.PIPE,shell=True)
out = child2.communicate()
print(out)
 ('   9   24   298\n', None)

p= subprocess.Popen(["wc"], stdin=subprocess.PIPE,stdout=subprocess.PIPE,shell=True)
p.stdin.write('your command')
p.stdin.flush()
#......do something
try:
  #......do something
  p.stdout.readline()
  #......do something
except:
  print('IOError')
#......do something more
p.stdin.write('your other command')
p.stdin.flush()
#......do something more