How to switch Python versions in Terminal?

问题

My Mac came with Python 2.7 installed by default, but I'd like to use Python 3.6.1 instead.

How can I change the Python version used in Terminal (on Mac OS)?

Please explain clearly and offer no third party version manager suggestions.

回答1:

The simplest way would be to add an alias to python3 to always point to the native python installed. Add this line to the .bash_profile file in your $HOME directory at the last,

alias python="python3"

Doing so makes the changes to be reflected on every interactive shell opened.

回答2:

You can just specify the python version when running a program:

for python 2:

python filename.py

for python 3:

python3 filename.py

回答3:

As Inian suggested, you should alias python to point to python 3. It is very easy to do, and very easy to switchback, personally i have an alias setup for p2=python2 and p3=python3 as well to save on keystrokes. Read here for more information: How do I create a Bash alias?

Here is an example of doing so for python:

alias python=python3

Like so:

$ python --version
Python 2.7.6
$ python3 --version
Python 3.4.3
$ alias python=python3
$ python --version
Python 3.4.3

See here for the original: https://askubuntu.com/questions/320996/how-to-make-python-program-command-execute-python-3

回答4:

If you have python various versions of python installed,you can launch any of them using pythonx.x.x where x.x.x represents your versions.

回答5:

Here is a nice and simple way to do it (but on CENTOS), without braking the operating system.

yum install scl-utils

yum install centos-release-scl-rh

And lastly you install the version that you want, lets say python3.5

yum install rh-python35

And lastly:

scl enable rh-python35 bash

Since MAC-OS is a unix operating system, the way to do it it should be quite similar.

来源：https://stackoverflow.com/questions/43354382/how-to-switch-python-versions-in-terminal

标签

python

django

bash

macos

terminal