使用Python中的子进程访问的Bash环境变量 [英] access Bash environment variable in Python using subprocess

问题描述

我能确定在Python终端与子进程，处理查询的宽度，如下列：

I can determine the width of the terminal in Python with a subprocess-handled query such as the following:

int(subprocess.Popen(['tput', 'cols'], stdout = subprocess.PIPE).communicate()[0].strip('\n'))

我怎么能确定以类似的方式Bash的用户名？那么，如何可以用子我看到的$ {USER}值在Python？

How could I determine the Bash user name in a similar way? So, how could I see the value of ${USER} in Python using subprocess?

推荐答案

由于Wooble和端午说，不使用子这一点。使用 os.getenv（用户）或 os.environ [USER] 。

As Wooble and dano say, don't use subprocess for this. Use os.getenv("USER") or os.environ["USER"].

如果你真的想使用子然后 POPEN（['庆典'，'-c'，'回声$ USER'] ，...）似乎工作一样 POPEN（回声$ USER，壳=真）虽然这些都不是特别愉快（虽然在命令行上使用的环境变量正在执行的外壳必须参与，所以你真的不能避免的话）。

If you really want to use subprocess then Popen(['bash', '-c', 'echo "$USER"'], ...) seems to work as does Popen("echo $USER", shell=True) though neither of those is particularly pleasant (though to use environment variables on the command line being executed the shell must be involved so you can't really avoid it).

编辑：我的previous子的建议似乎并没有正常工作。我相信我原来的测试是有缺陷的。

My previous subprocess suggestion did not seem to work correctly. I believe my original test was flawed.

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