创建一个在没有安装Python的系统上运行的Python虚拟环境。

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英文:

Create a python venv that works on systems with no python installed

问题

如何设置虚拟环境,以便用于调用Python脚本,但不需要系统范围的Python。

我的目标是在一个文件夹中拥有Python脚本以及Python本身,并包含该脚本所需的所有库。

我尝试使用PyCharm来管理我的虚拟环境,但PyCharm创建的虚拟环境需要系统范围的Python才能工作(我相当确定这是由于pyvenv.cfg文件需要引用系统范围的Python导致的)。

最终,我并不在意是否使用PyCharm或其他工具来创建虚拟环境,我只希望这能够正常工作。有什么建议吗?

我不想将其编译为可执行文件。

英文:

How do I setup a virtual environment in such a way that is can be used to call a python script, but doesn't need a system wide python.

My goal is it to have one folder with the python script in it and python itself in that folder as well with all the libs I need for that python script.

I've tried using pycharm to manage my venv, but the venv py charm creates needs a system wide python for the venv python to work. (I'm quite sure this is because of the pyvenv.cfg file which needs reference to a system wide python).

<br>
At the end of the day I don't care if I create the venv with pycharm or some other tool, I just want this to work. Any suggestions?

<br><br>
What I don't want, is to compile it to an executable.

答案1

得分: 1

以下是翻译的部分:

The way to go is NOT through a virtual environment in this case.
在这种情况下,不要使用虚拟环境。

I had to do it in the company I work - because some computers don't have internet.
我在我工作的公司中这样做 - 因为一些电脑没有互联网。

  1. create in you internet-connected computer a directory,
    into which you will install all the packages.
    Let's call it env.
    $ mkdir -p /path/to/env

  2. 在您连接互联网的计算机上创建一个目录,
    在该目录中您将安装所有的软件包。
    我们称之为 env
    $ mkdir -p /path/to/env

  3. When installing the required packages, add to pip install simply:
    -t /path/to/env (t for target directory)
    so:
    pip install -t /path/to/env packagename

  4. 在安装所需的软件包时,只需在 pip install 后面添加:
    -t /path/to/env (t 代表目标目录)
    因此:
    pip install -t /path/to/env packagename

  5. Transfer your env folder to your offline computer (via usb or whatever)

  6. 将您的 env 文件夹传输到您的离线电脑(通过 USB 或其他方式)

  7. add /path/to/env to your PYTHONPATH environment variable
    In Linux or mac add to ~/.bashrc into its content:
    export PYTHONPATH=/path/to/env:$PYTHONPATH
    In Windows, add to your: $profile.CurrentUserAllHosts:
    $env:PYTHONPATH=C:/path/to/env;${$env:PYTHONPATH} (use ; as delimiter!)
    PYTHONPATH determines where your Python looks for packages.
    The order matters - from left to right it is searched through.

  8. /path/to/env 添加到您的 PYTHONPATH 环境变量中
    在 Linux 或 macOS 上,将其添加到 ~/.bashrc 中的内容中:
    export PYTHONPATH=/path/to/env:$PYTHONPATH
    在 Windows 中,添加到您的:$profile.CurrentUserAllHosts
    $env:PYTHONPATH=C:/path/to/env;${$env:PYTHONPATH}(使用 ; 作为分隔符!)
    PYTHONPATH 决定了 Python 查找软件包的位置。
    顺序很重要 - 从左到右进行搜索。

  9. source ~/.bashrc in Linux
    . $profile.CurrentUserAllHosts in Windows
    to make the entered changes be executed, thus valid.

  10. 在 Linux 中执行 source ~/.bashrc
    在 Windows 中执行 . $profile.CurrentUserAllHosts
    以执行输入的更改,从而使其生效。

Voila, now your Python will be able to find the packages in your folder!
现在,您的 Python 将能够在您的文件夹中找到软件包!

systemwide or non-systemwide python
系统范围的或非系统范围的 Python

I don't know - I didn't tried myself.
我不知道 - 我自己没有尝试过。

You can start a local python by just giving the
absolute path to the python.exe (windows) or python binary (linux/mac=unix-derived).

In unix-derived systems, you can do:
在类Unix系统中,您可以这样做:

env PYTHONPATH=/path/to/env /path/to/python /path/to/script.py
使 PYTHONPATH 仅在此调用中有效。

In windows, you could do it using a function e.g. in PowerShell
在 Windows 中,您可以使用 PowerShell 中的函数来执行:

myscript () {
local PATH=/path/to/python;$env:PYTHON
local PYTHONPATH=/path/to/env
python /path/to/script.py
}

myscript
然后,在函数外部,变量保持不变。

英文:

The way to go is NOT through a virtual environment in this case.
I had to do it in the company I work - because some computers don't have internet.

  1. create in you internet-connected computer a directory,
    into which you will install all the packages.
    Let's call it env.
    $ mkdir -p /path/to/env
  2. When installing the required packages, add to pip install simply:
    -t /path/to/env (t for target directory)
    so:
    pip install -t /path/to/env packagename
  3. Transfer your env folder to your offline computer (via usb or whatever)
  4. add /path/to/env to your PYTHONPATH environment variable
    In Linux or mac add to ~/.bashrc into its content:
    export PYTHONPATH=/path/to/env:$PYTHONPATH
    In Windows, add to your: $profile.CurrentUserAllHosts:
    $env:PYTHONPATH=C:/path/to/env;${$env:PYTHONPATH} (use ; as delimiter!)
    PYTHONPATH determines where your Python looks for packages.
    The order matters - from left to right it is searched through.
  5. source ~/.bashrc in Linux
    . $profile.CurrentUserAllHosts in Windows
    to make the entered changes be executed, thus valid.

Voila, now your Python will be able to find the packages in your folder!

systemwide or non-systemwide python

I don't know - I didn't tried myself.

You can start a local python by just giving the
absolute path to the python.exe (windows) or python binary (linux/mac=unix-derived).

In unix-derived systems, you can do:

env PYTHONPATH=/path/to/env /path/to/python /path/to/script.py

to make the PYTHONPATH only valid for this call.

In windows, you could do it using a function e.g. in PowerShell

myscript () {
  local PATH=/path/to/python;$env:PYTHON
  local PYTHONPATH=/path/to/env
  python /path/to/script.py
}

myscript

Then, outside the function, the variable stays unchanged.

答案2

得分: 0

答案很简单,虚拟环境不适合这种情况。可移植/嵌入式 Python 是正确的选择。视频链接在这里:https://www.youtube.com/watch?v=z8kgu74jERM

英文:

The answer is simply, virtual environments are the wrong thing for this situation. Portable/ embedded Python is the correct thing. A video to that here https://www.youtube.com/watch?v=z8kgu74jERM

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  • 本文由 发表于 2023年3月31日 20:17:59
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