从python脚本更改目录:如何不打开新的shell [英] Changing directory from a python script: how to not open a new shell

问题描述

我有以下代码:

import os

unixshell=os.environ["SHELL"]
dir="/home/user/somewhere"
if os.path.isdir(dir):
    os.chdir(dir)
    os.system(unixshell)

这是我写给我经常在终端访问的书签文件夹的脚本的一部分.脚本的一部分进入(cd)到加了书签的目录.我以以下方式使用

This is part of a script I wrote to bookmark folders I visit often in the terminal. A part of the script goes (cd's) to the bookmarked directory. I use it in the following way

~/olddir$ bk.py go [handle to bookmarked directory]
~/bookmarkeddir$

但是，我不喜欢的是创建了一个新的bash shell，因此当我需要注销时，必须多次按下 CTRL + D .

But, the thing I don't like is that a new bash shell is created, so when I need logout, I have to press CTRL+D multiple times.

问题是，我可以在不创建新外壳的情况下更改目录吗?可以使用python 2.4中存在的模块来实现吗?还是我需要使用更高的版本?

The question is, can I change directory without creating a new shell? Is this possible using modules existent in python 2.4, or do I need to go to a higher version?

我的问题是该问题的重复部分:

My question is more duplicate of this question:

从子级更改父级进程的目录处理

推荐答案

问题是 python 在子进程中运行，并且它不能"更改父级(我说不能"，但是可能有些调试器可以做到这一点-不要去那里！).

The problem is that python runs in a child process, and it "can't" alter the current directory of the parent (I say "can't", but there are probably some debuggers that could do it - don't go there!).

最简单的解决方案是改用函数.例如:

The simplest solution is to use a function instead. For example:

bk() {
    dir="/home/user/somewhere"

    # equivalent to "if os.path.isdir(dir): os.chdir(dir)"
    [[ -d $dir ]] && cd "$dir"
}

将其放入名为 bk.sh 的文件中(例如).

Put this into a file called bk.sh (for example).

要编译和加载函数，请执行以下操作:

To compile and load the function do:

. bk.sh

然后，只要您想更改目录，就使用 bk .

Then use bk whenever you want to change directory.

与函数的区别在于它在当前进程中运行，不会创建新的shell.

The difference with a function is that it runs in the current process, it does not create a new shell.

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