在Python中读写环境变量？

发布于 2024-11-07 04:01:43 字数 285 浏览 0 评论 0原文

我的 python 脚本调用了许多 python 函数和 shell 脚本。我想在Python（主调用函数）和所有子进程（包括shell脚本）中设置一个环境变量来查看环境变量集。

我需要设置一些环境变量，如下所示：

DEBUSSY 1
FSDB 1

1 是一个数字，而不是字符串。另外，如何读取存储在环境变量中的值？（就像另一个 python 子脚本中的 DEBUSSY/FSDB 一样。）

原文

My python script which calls many python functions and shell scripts. I want to set a environment variable in Python (main calling function) and all the daughter processes including the shell scripts to see the environmental variable set.

I need to set some environmental variables like this:

DEBUSSY 1
FSDB 1

1 is a number, not a string. Additionally, how can I read the value stored in an environment variable? (Like DEBUSSY/FSDB in another python child script.)

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

相守太难 2024-11-14 04:01:43

尝试使用 os 模块。

import os

os.environ['DEBUSSY'] = '1'
os.environ['FSDB'] = '1'

# Open child processes via os.system(), popen() or fork() and execv()

someVariable = int(os.environ['DEBUSSY'])

请参阅 os.environ 上的 Python 文档。另外，有关生成子进程的信息，请参阅 Python 的子进程文档。

Try using the os module.

import os

os.environ['DEBUSSY'] = '1'
os.environ['FSDB'] = '1'

# Open child processes via os.system(), popen() or fork() and execv()

someVariable = int(os.environ['DEBUSSY'])

See the Python docs on os.environ. Also, for spawning child processes, see Python's subprocess docs.

回复收藏 0 原文

無處可尋 2024-11-14 04:01:43

首先，读书是解决问题的优秀方法；这是权宜之计和解决问题的长期投资之间的区别。千万不要错过任何学习的机会。 :D

您可能选择将1解释为数字，但环境变量并不关心。它们只是传递字符串：（

   The argument envp is an array of character pointers to null-
   terminated strings. These strings shall constitute the
   environment for the new process image. The envp array is
   terminated by a null pointer.

来自 environ(3posix)。）

您可以使用 os.environ类似字典的对象：

>>> import os
>>> os.environ["HOME"]
'/home/sarnold'
>>> os.environ["PATH"]
'/home/sarnold/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
>>> os.environ["PATH"] = os.environ["PATH"] + ":/silly/"
>>> os.environ["PATH"]
'/home/sarnold/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/silly/'

First things first :) reading books is an excellent approach to problem solving; it's the difference between band-aid fixes and long-term investments in solving problems. Never miss an opportunity to learn. :D

You might choose to interpret the 1 as a number, but environment variables don't care. They just pass around strings:

   The argument envp is an array of character pointers to null-
   terminated strings. These strings shall constitute the
   environment for the new process image. The envp array is
   terminated by a null pointer.

(From environ(3posix).)

You access environment variables in python using the os.environ dictionary-like object:

>>> import os
>>> os.environ["HOME"]
'/home/sarnold'
>>> os.environ["PATH"]
'/home/sarnold/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
>>> os.environ["PATH"] = os.environ["PATH"] + ":/silly/"
>>> os.environ["PATH"]
'/home/sarnold/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/silly/'

回复收藏 0 原文