#Python subprocess get output windows how to#
#Python subprocess get output windows code#

Using IDLE with Python 2.7.5, When I run this code from file Expts.py: import subprocess r subprocess.checkoutput('cmd.exe dir',shellFalse) print r in the Python Shell, I ONLY get the output corresponding to cmd.exe the dir part is ignored. write ('command ') let the shell output the result: sleep(0.1) get the output while True: output p. > child subprocess.Popen('ls','-l', stdoutsubprocess.PIPE, stderrsubprocess.STDOUT) Then we can get the subprocess execution result output text using the child processвЂ™s stdout read() method. from subprocess import Popen, PIPE from time import sleep run the shell as a subprocess: p Popen('python', 'shell.py', stdin PIPE, stdout PIPE, stderr PIPE, shell False) issue command: p.

#Python subprocess get output windows how to#

What's wrong with my new code? Please let me know how to fix this.Дesired Output in both console and log.txt file 1. I would like to expand on the Windows solution. the child process will print it's standard output to a pipe line, the pipe line connect the child process and it's parent process. I was hoping to get similar output on both console and log.txt file. Some of the output only displayed on the console ( os.system('ver') and n('whoami')) while the print() function was only displayed on log.txt file and not in the console anymore. Unfortunately, this didn't really work as expected. On UNIX child watchers are used for subprocess finish waiting, see Process Watchers for more info. On Windows subprocesses are provided by ProactorEventLoop only (default), SelectorEventLoop has no subprocess support. After') # This appear in message.log only, but NOT in console Subprocess and Threads Standard asyncio event loop supports running subprocesses from different threads by default.

n('whoami') # This appear in console only, but NOT in message.log import subprocess, time from threading import Thread def enqueueoutput(out): print 'Hello from enqueueoutput' for line in iter(out.readline,''): line line.rstrip(' ') print 'Got s' line out.close() proc subprocess.Popen('thirdparty.exe', stdoutsubprocess.PIPE, bufsize1) thread Thread(targetenqueueoutput, args(proc.stdout,)) thread.daemon True thread.start() time.

Os.system('ver') # This appear in console only, but NOT in message.log On Python 3.7 or higher, if we pass in captureoutputTrue to n (), the CompletedProcess object returned by run () will contain the stdout (standard output) and stderr (standard error) output of the subprocess: p.stdout and p.stderr are bytes (binary data), so if we want to use them as UTF-8 strings, we have to first. Before') # This appear in message.log only, but NOT in console The only way I managed to get first 3 lines was by simply taking first 3 items from the list. However, I am interested only in first 3 lines of the stdout. Currently my code saves all the lines of stdout to a list ('lines' in the code below). Then, I decided to have a copy on a log file (log.txt) too while maintaining the original output to the console. I am using subprocess module to execute a process and read stdout returned by it. Initial Code to display output in the console only import os, subprocess Initially, I've a simple program to print out the whole output to the console.