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subprocess stdout data
def runCommand(commandLine):
    print('############## Running command: ' + commandLine)
    p = subprocess.Popen(commandLine, shell = True, stdout = subprocess.PIPE)
    print (p.stdout.read().decode('utf-8'))

import subprocess
proc = subprocess.Popen('cmake', shell=True, stdout=subprocess.PIPE)
while proc.poll() is None:
    output = proc.stdout.readline()
    print output

# grep test test.txt
test
 ^
 |
 |------- this word is red

# grep test test.txt | cat
test
 ^
 |
 |------- no longer red

# grep test test.txt --color=always | cat
test
 ^
 |
 |------- red again

p.stdout.read

for line in p.stdout: