Anaconda将python3设置为默认值后，如何切换回python2？

Piyush Deshmukh 发表于 Dev

皮尤什·德什穆克（Piyush Deshmukh）

最近，我在15.04上安装了Anaconda3-2.5.0-Linux-x86_64.sh并最终完成了此任务！

:~$ python --version
Python 3.5.1 :: Anaconda 2.5.0 (64-bit)

:~$ python2 --version
Python 2.7.9

:~$ python3 --version
Python 3.5.1 :: Anaconda 2.5.0 (64-bit)

在安装的最后时刻，我确实yes急着输入了一些内容，我想它必须对此做些什么。（好的，我的错，我应该仔细处理，但是现在我需要帮助，而不是批评）。

AFAIK这肯定会破坏其他程序。现在我该怎么做？

我认为可以的。

可以使用别名吗？

alias python=python2

但是我不确定。

内芬

我在VM中进行了安装，然后发生了以下情况。

安装程序要求安装位置。默认值为/home/myuser/anaconda3。

At the end you'll be asked

Python 3.5.1 :: Continuum Analytics, Inc.
creating default environment...
installation finished.
Do you wish the installer to prepend the Anaconda3 install location
to PATH in your /home/myuser/.bashrc ? [yes|no]
[no] >>> yes

Prepending PATH=/home/myuser/anaconda3/bin to PATH in /home/myuser/.bashrc
A backup will be made to: /home/myuser/.bashrc-anaconda3.bak

To restore the old behavior, go to your home directory and do

mv .bashrc-anaconda3.bak .bashrc

then start a new shell.

As you suggest, you could alias python=python2, but I find that a bit weird. I would

Restore the original .bashrc
Create (if it does not exist) ~/bin
Link ln -s ~/anaconda3/bin/python3 ~/bin/python3
[Prepend $HOME/bin to $PATH](Should already be set by default by ~/.profile)
Relogin.

That way, calling python3 will start the one from Anaconda.

An important point is, that the original /usr/bin/python is still there, and still points to python2.7. The ramifications of having python->python3 in your path depend on how a specific script is called.

如果使用shebang #!/usr/bin/python（就像Ubuntu附带的所有可执行文件中一样），则不会有任何变化。另一方面，#!/usr/bin/env python有时会使用更好的可移植性，这将导致python3.5被调用。

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