Python後台執行不啟用緩衝

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1、運行時加-u參數，如 # python3 -u test.py >> test.log &

用man查看python的-u參數，說明如下：

    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.

強制stdin，stdout和stderr完全不緩衝。

2、在不要緩衝的每一次print後面添加sys.stdout.flush()函數

3、指令碼頭部添加-u，如#!/usr/local/bin/python -u，道理同方法1

4、添加環境變數 PYTHONUNBUFFERED=1

Python後台執行不啟用緩衝