脚本在读取stdout时卡住，不再继续执行，也不发生终止
1
740import subprocess
p = subprocess.Popen(["mplayer", "-slave", "-quiet", "/home/pi/Music/爱的翅膀.mp3"], stdin = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = False)
p.stdin.write('\n')
print p.stdout.read() //此处
p.stdin.write('get_time_pos\n')
print p.stdout.read()
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