Python 유용한 샘플 코드

1. 튜플로 구성된 리스트 정렬

test_list = [ (1,2,3), ..., (1,4,1) ] 

test_list = sorted(test_list, key=lambda x: x[2])

2. non-blocking subprocess, Popen

def subprocess_open(command):
    popen = subprocess.Popen(command, stdout=subprocess.PIPE, 
                                      stderr=None, shell=True)
    while True:
        out = popen.stdout.read(1)
        if out == '' and popen.poll() is not None:
            break
        if out != '':
            sys.stdout.write(out)
            sys.stdout.flush()