Windows users have the most difficulty in installing virtualenv, so if you want to avoid the trouble then
install Python 3.4. If you want to install virtualenv on Windows then the easiest way is by
installing pip first, as explaned in this page. Once pip is installed, the following
command installsvirtualenv`:
$ pip install virtualenv
We've seen above how to create a virtual environment in Python 3.4. For older versions of Python that
have been expanded with virtualenv, the command that creates a virtual environment is the
following:
$ virtualenv flask
Regardless of the method you use to create the virtual environment, you will end up with a folder
named flask that contains a complete Python environment ready to be used for this project.
Virtual environments can be activated and deactivated, if desired. An activated environment adds the
location of its bin folder to the system path, so that for example, when you type python you get the
environment's version and not the system's one. But activating a virtual environment is not necessary, it
is equally effective to invoke the interpreter by specifying its pathname.
If you are on Linux, OS X or Cygwin, install flask and extensions by entering the following commands,
one after another:
$ flask/bin/pip install flask
$ flask/bin/pip install flask-login
$ flask/bin/pip install flask-openid
$ flask/bin/pip install flask-mail
$ flask/bin/pip install flask-sqlalchemy
$ flask/bin/pip install sqlalchemy-migrate
$ flask/bin/pip install flask-whooshalchemy
$ flask/bin/pip install flask-wtf
$ flask/bin/pip install flask-babel
$ flask/bin/pip install guess_language
$ flask/bin/pip install flipflop
$ flask/bin/pip install coverage
If you are on Windows the commands are slightly different:
$ flask\Scripts\pip install flask
$ flask\Scripts\pip install flask-login
$ flask\Scripts\pip install flask-openid
$ flask\Scripts\pip install flask-mail
$ flask\Scripts\pip install flask-sqlalchemy
$ flask\Scripts\pip install sqlalchemy-migrate
$ flask\Scripts\pip install flask-whooshalchemy
$ flask\Scripts\pip install flask-wtf
$ flask\Scripts\pip install flask-babel
$ flask\Scripts\pip install guess_language
$ flask\Scripts\pip install flipflop
$ flask\Scripts\pip install coverage
