Get standard output in real time with Python subprocess

import sys
import subprocess


def get_lines(cmd):
    '''
    :param cmd:str command to execute.
    :rtype: generator
    :return:Standard output(Line by line).
    '''
    proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    
    while True:
        line = proc.stdout.readline()
        if line:
            yield line
        
        if not line and proc.poll() is not None:
            break


if __name__ == '__main__':
    for line in get_lines(cmd='du ~/'):
        sys.stdout.write(line)

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