Operation of python subprocess pipe real time output log

* test11.py

import time
print "1"
time.sleep(2)
print "1"
time.sleep(2)
print "1"
time.sleep(2)
print "1"

* test.py

import subprocess

p = subprocess.Popen("python test11.py", shell=True, stdout=subprocess.PIPE)

# None means in progress

while p.poll() is None: < br > out = p. stdout. readline () < br > if out! = "": < br > print out

Additional knowledge: python executes commands through subprocess. Popen to redirect real-time output

Execute a command

import subprocess
import sys

#  Common code 
GBK = 'gbk'
UTF8 = 'utf-8'

#  Decoding mode, 1 Like  py  File executes as utf-8  , cmd  The command is  gbk
current_encoding = GBK
popen = subprocess.Popen('ping www.baidu.com', shell = True,
             stdout = subprocess.PIPE,
             stderr = subprocess.PIPE,
             bufsize = 1)
out,err = popen.communicate()
print('std_out: ' + out)
print('std_err: ' + err)
print('returncode: ' + str(popen.returncode))

Execute the. py file

import subprocess
import sys

#  Common code 
GBK = 'gbk'
UTF8 = 'utf-8'

current_encoding = UTF8 
popen = subprocess.Popen('python D:\code\test.py',
             stdout = subprocess.PIPE,
             stderr = subprocess.PIPE,
             bufsize = 1)
out,err = popen.communicate()
print('std_out: ' + out)
print('std_err: ' + err)
print('returncode: ' + str(popen.returncode))