如何使用Homebrew在Mac上同时安装Python 2和3? [英] How can I use Homebrew to install both Python 2 and 3 on Mac?

问题描述

我需要能够在Python 2和3之间来回切换.我如何使用Homebrew做到这一点，因为我不想弄乱路径并遇到麻烦. 现在我已经通过Homebrew安装了2.7.

I need to be able to switch back and forth between Python 2 and 3. How do I do that using Homebrew as I don't want to mess with path and get into trouble. Right now I have 2.7 installed through Homebrew.

推荐答案

我会使用 pyenv 安装它:

$ brew install pyenv

要在您的Bash shell中启用pyenv，您需要运行:

To enable pyenv in your Bash shell, you need to run:

$ eval "$(pyenv init -)"

要在启动时自动为Bash执行此操作，请将该行添加到您的~/.bash_profile. ¹

To do this automatically for Bash upon startup, add that line to your ~/.bash_profile. ¹

一旦安装了pyenv并将其激活，就可以安装不同版本的python并选择可以使用的版本.示例:

Once you have installed pyenv and activated it, you can install different versions of python and choose which one you can use. Example:

$ pyenv install 2.7.5

您可以检查已安装的版本:

You can check the versions you have installed with:

$ pyenv versions

您可以使用以下命令在python版本之间进行切换:

And you can switch between python versions with the command:

$ pyenv global 3.3.1

您还可以使用以下命令为当前目录设置python版本:

Also you can set a python version for the current directory with:

$ pyenv local 3.5.2

您可以通过运行python --version进行检查:

You can check by running python --version:

$ python --version
Python 3.5.2

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¹ _{Homebrew用来指导您在安装pyenv时执行此操作，但是}

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¹ _{Homebrew used to instruct you to do this upon installation of pyenv, but the message was removed. For Zsh and other shells, the precise steps may be different.}

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