在python2虚拟环境中安装python3 [英] Installing python3 in a python2 virtual environment

问题描述

我有一个在python2的虚拟环境中运行的应用程序。

无可否认，就虚拟环境而言，我是一个新手...

本质上，我正在运行一个python3程序，所以我需要安装python3到虚拟环境。我该怎么做呢？我必须重新创建环境吗？这是一个困难的迁移？

解决方案

不建议混合Python的两个版本，实际上我不认为它甚至可能。创建一个新的virtualenv并不难。

第1步
获取当前虚拟环境中的模块列表

  source / path / to / current / bin / activate 
 pip freeze> /tmp/requirements.txt 
  

第2步
创建一个新的virtualenv。请在执行virtualenv命令之前将其更改为合适的目录或提供完整路径。

 取消激活
 virtualenv -p python3 envname 
  

步骤3
安装模块

  source envname / bin / activate 
 pip install -r /tmp/requirements.txt 
  

就是这样。

I have a flask app that is running in a virtual environment of python2.

Admittedly, I'm somewhat of a newbie as far as it comes to virtual environments...

Essentially, I'm looking to run a python3 program, so I need to install python3 into the virtual environment. How do I do this? Do I have to recreate the environment? Is this a difficult migration?

解决方案

It's not recommended to mix two versions of python, In fact I don't think it's even possible. Creating a new virtualenv isn't difficult at all.

Step 1 Get the list of modules in the current virtualenv

source /path/to/current/bin/activate
pip freeze > /tmp/requirements.txt

Step 2 Create a new virtualenv. Either change into a suitable directory before executing the virtualenv command or give a full path.

 deactivate
 virtualenv -p python3 envname

Step 3 Install modules

source envname/bin/activate
pip install -r /tmp/requirements.txt

That's it.

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