QT - qprocess. Can not read output from Python

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QT

hi i have an question how can i get output from python by using QProcess.
there are one python script and QT project
i call python script from QProcess. it was done. but when i try to get output from my QProcess, i coudln`t get output. i got only Except Message from System.

my output is 'print' from python.

there are my sample code.
QT :

proc2 = new QProcess();
    proc2->setWorkingDirectory("My Directory");
    proc2->start("My Project");
    if(proc2->waitForStarted(-1)){
        while(proc2->waitForReadyRead(-1)){
            QByteArray a = proc2->readAllStandardOutput();
            qDebug()<<a;
        }
    }
    qDebug()<<"Finish";

and here is my python sample Project

import sys
import os
import time
def main():

    i = 0
    while True:
        print "test"
        sys.stout.flush()
        time.sleep(2)

when i run program, i coudln`t get "test" output.
but i checked if the program is runnung.

What I have tried:

connect ReadyRead Event in QT
i tried
print("")
sys.stout.write("")
print ""
at python.

when i run other my process by QProcess, i could get only Except Message.
but i coudln`t get output from 'print'