012_python在shell下单行执行多行代码

一、有时候只是简单的获取下时间戳,不想在python解释器的交互模式下再去执行python代码,如何实现呢?

以循环输出多行为例:

(1)第一种方式:

python -c "exec(\"import sys\nfor r in range(3): print 'arun'\")"

arun

arun

arun

(2)第二种方式:

(echo "import sys" ; echo "for r in range(3): print 'arun'") | python

arun

arun

arun

二、实践

showtime () {

	(

		echo "import datetime"

		echo 'print str(datetime.datetime.now()).split(".")[0].replace("-","").replace(":","").replace(" ","")'

	) | python

}

效果如下:

showtime

20190302100502