python subprocess communicate print stdout and stderr code example
Example 1: python subprocess print stdout while process running
from subprocess import Popen, PIPE, CalledProcessError
with Popen(cmd, stdout=PIPE, bufsize=1, universal_newlines=True) as p:
for b in p.stdout:
print(b, end='')
if p.returncode != 0:
raise CalledProcessError(p.returncode, p.args)
Example 2: python write subprocess stdout stderr to file
with open("stdout.txt","wb") as out, open("stderr.txt","wb") as err:
subprocess.Popen("ls",stdout=out,stderr=err)