We will create a directory call
virtual inside which we will have two different virtual environment.
The following commands will the create an env called virt1.
[user@host]$ cd virtual
[user@host]$ virtualenv virt1
New python executable in virt1/bin/python
Installing setuptools............done.
Installing pip...............done.
Now we can virt1 environment.
[user@host]$ source virt1/bin/activate
(virt1)[user@host]$
The firt part of the prompt is now name of the virtual environment, it will help you to understand which environment you are in when you will have many environments.
To deactivate the environment use
deactivate command.
(virt1)[user@host]$ deactivate
[user@host]$
So, now we will install a python module called redis.
(virt1)[user@host]$ pip install redis
Downloading/unpacking redis
Downloading redis-2.6.2.tar.gz
Running setup.py egg_info for package redis
Installing collected packages: redis
Running setup.py install for redis
Successfully installed redis
Cleaning up...
Same way we can install a project called yolk, which can tell us which all modules are installed.
(virt1)[user@host]$ pip install yolk
(virt1)[user@host]$ yolk -l
Python - 2.7.3 - active development (/usr/lib64/python2.7/lib-dynload)
pip - 1.1 - active
redis - 2.6.2 - active
setuptools - 0.6c11 - active
wsgiref - 0.1.2 - active development (/usr/lib64/python2.7)
yolk - 0.4.3 - active
Now we will create another virtual environment
virt2 where we will install same redis module but an old 2.4 version.
[user@host]$ virtualenv virt2
New python executable in virt1/bin/python
Installing setuptools............done.
Installing pip...............done.
[user@host]$ source virt2/bin/activate
(virt2[user@host]$
(virt2)[user@host]$ pip install redis==2.4
Downloading/unpacking redis
Downloading redis-2.4.0.tar.gz
Running setup.py egg_info for package redis
Installing collected packages: redis
Running setup.py install for redis
Successfully installed redis
Cleaning up...
(virt1)[user@host]$ pip install yolk
(virt1)[user@host]$ yolk -l
Python - 2.7.3 - active development (/usr/lib64/python2.7/lib-dynload)
pip - 1.1 - active
redis - 2.4.0 - active
setuptools - 0.6c11 - active
wsgiref - 0.1.2 - active development (/usr/lib64/python2.7)
yolk - 0.4.3 - active
As you can see yolk says that in this envrionment we have redis 2.4 installed. This way you can have many different environments for your all development needs.
