[Python] How to Use virtualenvwrapper to switch between different versions of python?

[Python] How to Use virtualenvwrapper to switch between different versions of python?

I have long heard that virtualenv is one of the essential artifacts of python, but I have always thought that the python 2.7 provided by mac is very useful. It seems that virtualenv is not necessary, but today I saw a new python open-source project on github, python3 is required, so virtualenv must be used.

1. Install virtualenv and 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

Make

Make install

3. Create an environment

Mkvirtualenv env27

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

In this way, the virtual environments of python2.7 and 3.4 are created respectively.

4. Switch

Workon env27

Let's take a look at the python version.

Python -- version

> Python 2.7.6

Switch to a 3.4 Environment

Workon env34

Check the version

Python -- version

> Python 3.4.0

It seems that both versions of python work normally :)

5.

Exit environment: deactivate

Delete environment: rmvirtualenv env_name