CODEWITHSUNDEEP
python-3.x
tairqammar
tairqammar

Reputation: 161

Python subprocess realtime output

I am trying to print in realtime the output from a C++ exe started from python 3.6.6-x64 using subprocess module. I tried everything from google and other questions and I always get the output when the subprocess exited.

This is the code snippet:

        try:
            process = Popen(fullcmdtokens, stdout=PIPE, stderr=STDOUT, encoding='utf8', shell=True, errors='replace')
        except Exception as exception:
            print(exception)
        else:
            while process.poll() is None:
                for lline in process.stdout:
                    process.stdout.flush()
                    edit_and_do_stuff(lline)
                    print(lline)

I also tried using

process.stdout.readline()

and

process.stdout.read(1)

and i modified the C++ exe to flush after every print.

Any ideas?

Upvotes: 0

Views: 194

Answers (1)

Anonymous
Anonymous

Reputation: 12017

You can do it if you don’t send stdout to a pipe:

try:
    process = Popen(fullcmdtokens, stderr=STDOUT, encoding='utf8', shell=True, errors='replace')
except Exception as exception:
    print(exception)

If you need to change each line:

try:
    process = Popen(fullcmdtokens, stdout=PIPE, stderr=STDOUT, encoding='utf8', shell=True, errors='replace')
    while process.poll() is None:
        for lline in process.stdout:
            process.stdout.flush()
            edit_and_do_stuff(lline)
            print(lline)
except Exception as exception:
    print(exception)

Upvotes: 1

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