python -u 命令行参数

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关闭stdin/stdout/stderr缓冲区.
-u :

  • unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x.
  • Force stdin, stdout and stderr to be totally unbuffered. On systems where it matters, also put stdin, stdout and stderr in binary mode. Note that there is internal buffering in xreadlines(), readlines() and file-object iterators (“for line in sys.stdin”) which is not influenced by this option. To work around this, you will want to use “sys.stdin.readline()” inside a “while 1:” loop.

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