Python 3.4.3 subprocess.Popen get output of command without piping?

Question

I am trying to assign the output of a command to a variable without the command thinking that it is being piped. The reason for this is that the command in question gives unform

Answer 1

Using pexpect:

2.py:

import sys

if sys.stdout.isatty():
    print('hello')
else:
    print('goodbye')

subprocess:

import subprocess

p = subprocess.Popen(
    ['python3.4', '2.py'],
    stdout=subprocess.PIPE
)

print(p.stdout.read())

--output:--
goodbye

pexpect:

import pexpect

child = pexpect.spawn('python3.4 2.py')

child.expect(pexpect.EOF)
print(child.before)  #Print all the output before the expectation.

--output:--
hello

Here it is with grep --colour=auto:

import subprocess

p = subprocess.Popen(
    ['grep', '--colour=auto', 'hello', 'data.txt'],
    stdout=subprocess.PIPE
)

print(p.stdout.read())

import pexpect

child = pexpect.spawn('grep --colour=auto hello data.txt')
child.expect(pexpect.EOF)
print(child.before)

--output:--
b'hello world\n'
b'\x1b[01;31mhello\x1b[00m world\r\n'