How to display command output in Flask using the Subprocess python module

Question

Below is my code

view.py

from flask import render_template
#Import variables stored in _init_.py
from app import app

@app.route('/')
@app.route('/index')
def index():
import subprocess
memory = subprocess.Popen(['date'])
out,error = memory.communicate()

return render_template('view.html', out=out, error=error)

view.html

It prints none, none, I am not sure what's wrong as it works fine in the python script

Update : Thanks for the answers, this is how you can do it

2 notes - 1. why do use multiple annotations for your REST path 2. please explain "it works fine in my python script", which script ? — Shmil The Cat
– Shmil The Cat, Commented Dec 15, 2014 at 9:26

Nonnib · Accepted Answer · 2014-12-15 09:38:48Z

2

If you want to grab stdout from your command you need to add stdout=subprocess.PIPE as in:

memory = subprocess.Popen(['date'], stdout=subprocess.PIPE)

answered Dec 15, 2014 at 9:38

Nonnib

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2 Comments

Leyo R Over a year ago

Is this compulsory? As I was able to display the output of my command without the pipe in my python script, Also, along with the date, I get numbers I am not sure why,

Nonnib Over a year ago

If you want the output into a variable, yeah. If you don't specify it then it'll go out to the standard out channel, e.g. your command line if you run it as a standalone script.

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