How can [Python] use virtualenvwrapper to switch between different versions of Python? __python

I've long heard that virtualenv is one of the essential artifacts of Python, But always feel that the Mac python2.7 is very easy to use, as if there is no need for virtualenv, but today on the 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. Install 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 (List of notes. Localpython)

Make

Make install

3. Create an environment

Mkvirtualenv env27

Mkvirtualenv-p/users/heliclei/.localpython/bin/python3.4 env34 (notes. Localpython directory)

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

4. Switch

Workon env27

Look at the Python version.

Python--version

>>python 2.7.6

and cut to 3.4 of the environment.

Workon env34

Check the version.

Python--version

>>python 3.4.0

It appears that two versions of Python are working correctly:

5.

Exit Environment: Deactivate

Delete environment: Rmvirtualenv env_name

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