[Python] How do I switch between different versions of Python using Virtualenvwrapper?

I've heard that Virtualenv is one of the essential Python artifacts, But always feel that Mac comes with python2.7 is very useful, as if there is no need to use virtualenv, but today on GitHub to see a new Python open source project, need to use Python3, so must virtualenv.

1. Install virtualenv, Virtualenvwrapper

sudo pip install virtualenv

sudo pip install Virtualenvwrapper

2. Installing python3.4

mkdir ~/SRC

CD ~/src/

wget http://www.python.org/ftp/python/3.4.0/Python-3.4.0.tgz

TAR-ZXVF python-3.4.0.tgz

CD Python-3.4.0

mkdir ~/.localpython

./configure--prefix=/users/heliclei/.localpython

Make

Make install

3. Create an environment

Mkvirtualenv env27

Mkvirtualenv-p/users/heliclei/.localpython/bin/python3.4 env34

This establishes the python2.7 and 3.4 Two versions of the virtual environment, respectively.

4. Toggle

Workon env27

Take a look at the Python version

Python--version

>>python 2.7.6

And then cut to 3.4 of the environment.

Workon env34

Check the version.

Python--version

>>python 3.4.0

It looks like two versions of Python are working correctly:)

5.

Exit Environment: Deactivate

Delete environment: rmvirtualenv env_name

[Python] How do I switch between different versions of Python using Virtualenvwrapper?