如何在OS X上设置Python的默认版本到3.3 ?

I'm running Mountain Lion and the basic default Python version is 2.7. I downloaded Python 3.3 and want to set it as default.

我正在运行Mountain Lion，基本的默认Python版本是2.7。我下载了Python 3.3，并希望将其设置为默认值。

Currently:

目前:

$ python
    version 2.7.5
$ python3.3
    version 3.3

How do I set it so that every time I run $ python it opens 3.3?

我如何设置它，以便每次运行$ python时，它将打开3.3?

6 个解决方案

#1

267

Changing the default python version system wide would break some applications that depend on python2.

改变默认的python版本系统将会破坏一些依赖于python2的应用程序。

You can alias the commands in most shells, Mac OS X uses bash by default, if you also do put this into your ~/.bash_profile:

您可以在大多数shell中别名命令，Mac OS X在默认情况下使用bash，如果您也将其放到~/.bash_profile中:

alias python='python3'

python command now refers to python3. If you want the original python (that refers to python2), you can escape the alias i.e. doing \python will launch python2 leaving the alias untouched)

python命令现在指的是python3。如果您想要原始的python(指的是python2)，您可以摆脱别名，即执行\python将启动python2，使别名保持不变。

If you launch interpreters more often (I do), better is to:

如果你更经常地启动译员(我做)，最好是:

alias 2='python2'
alias 3='python3'

Tip: Instead of doing:

提示:而不是做:

#!/usr/bin/env python

use:

使用:

#!/usr/bin/env python3

system will use python3 for running python executables.

系统将使用python3来运行python可执行程序。

#2

You can solve it by symbolic link.

你可以通过符号链接来解决它。

unlink /usr/local/bin/python
ln -s /usr/local/bin/python3.3 /usr/local/bin/python

#3

Go to 'Applications', enter 'Python' folder, there should be a bash script called 'Update Shell Profile.command' or similar. Run that script and it should do it.

进入“应用程序”，输入“Python”文件夹，应该有一个名为“更新Shell Profile.command”或类似的bash脚本。运行那个脚本，它应该这样做。

Edit: Hey, just come across this how to change default python version?, it looks like you should not update it.

编辑:嘿，遇到这个如何改变默认的python版本?看起来你不应该更新它。

#4

I'm not sure if this is available on OS X, but on linux I would make use of the module command. See here.

我不确定这是否在OS X上可用，但是在linux上我将使用模块命令。在这里看到的。

Set up the modulefile correctly, then add something like this to your rc file (e.g. ~/.bashrc):

正确设置modulefile，然后向rc文件(例如~/.bashrc)中添加类似的内容。

module load python3.3

This will make it so that your paths get switched around as required when you log in without impacting any system defaults.

这将使您的路径在不影响任何系统默认值的情况下按需要被转换。

#5

I think when you install python it puts export path statements into your ~/.bash_profile file. So if you do not intend to use Python 2 anymore you can just remove that statement from there. Alias as stated above is also a great way to do it.

我认为，当您安装python时，它会将导出路径语句放入您的~/中。bash_profile文件。所以如果你不打算使用Python 2，你可以从那里删除它。如上所述的别名也是一个很好的方法。

Here is how to remove the reference from ~/.bash_profile - vim ./.bash_profile - remove the reference (AKA something like: export PATH="/Users/bla/anaconda:$PATH") - save and exit - source ./.bash_profile to save the changes

下面是如何删除~/的引用。bash_profile——vim。/。bash_profile -删除引用(类似于:export PATH="/Users/bla/anaconda:$PATH") -保存和退出源。bash_profile以保存更改。

#6

I believe most of people landed here are using ZSH thorugh iterm or whatever, and that brings you to this answer.

我相信这里的大多数人都是用ZSH thorugh iterm或者别的什么，这就引出了这个答案。

You have to add/modify your commands in ~/.zshrc instead.

你必须在~/修改你的命令。zshrc代替。

#1

267