How to install virtualenv and virtualenvwrapper in python

1. First introduce the common pip commands

pip installation command: pip install package_name
pip upgrade command: pip install –ungrage package_name
pip uninstall command: pip uninstall package_name

Such as
pip install django
pip install -U django

2. virtualenv installation

virtualenv installation:

$ sudo pip install virtualenv

or

$ sudo apt-get install python-virtualenv
If it is a Mac OS X system, you can use easy_install to install virtualenv:

$ sudo easy_install virtualenv
Check the version number of virtualenv, or check whether virtualenv is installed on the system:

$ virtualenv --version
Use virtualenv to create a virtual environment. Generally, the virtual environment is named venv:

$ virtualenv venv
Activate this virtual environment:

$ source venv/bin/activate
If you use Microsoft windows system, the activation command is:

$ venv\Script\activate
The command to activate the virtual environment will modify the command line prompt and add the environment name:

(venv) $
After the work in the virtual environment is completed, if you want to return to the global Python interpreter, You can enter deactivate at the command line prompt
Execute the following command to install Flask in the virtual environment

(venv) $ pip install flask
Verify that Flask is installed correctly:

(venv) $ python
>>> import flask
>>>

3. Installation of virtualenvwrapper

Installation of virtualenvwrapper:

$ sudo pip install virtualenvwrapper
After the installation is completed, the virtualwrapper shell script will be generated in the following location.

/usr/local/bin/virtualenvwrapper.sh
When using virtualenvwrapper, you need to configure the login shell initialization script and read the virtualenvwrapper.sh information into the current shell environment. Taking base as an example, you can make the following modifications to the .bashrc configuration file in the user root directory (i.e. /home/[username]).
Modify .bashrc:

if [ -f /usr/local/bin/virtualenvwrapper.sh ]; then
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/ bin/virtualenvwrapper.sh
fi

Read .bashrc again:

$ source ~/.bashrc
We can enter the command mkvirtualenv to see if it is available.

$ mkvirtualenv --help
After setting up, you can operate the virtual environment through the following command:

Create a virtual environment:

$ mkvirtualenv env
Confirm the virtual environment:

$ ls -la $HOME/.virtualenvs
Similarities and differences with virtualenv. Among them, the command to exit the virtual running environment is also deactivate, and enter the virtual running environment. The command becomes workon.
Exit the virtual environment:

(venv) $ deactivate
Enter an existing environment or switch environments. Assume that there is a virtual environment named env:

$ workon env
Browse the virtual environment:

$ workon
Delete the virtual environment:

$ rmvirtualenv env

4. Install pip common packages in the virtual environment with one click

In the requirements.txt file, write package or package==version number or package>=version number:

Django==1.7.7
django-debug-toolbar
ply
MySQL-python
uwsgi
flup
Flask
Pillow
markdown2

One-click installation command:

(venv) $ pip install - r requirements.txt
During the execution of the one-click installation command above, the system reported an error when configuring MySQL-Python, prompting:

EnvironmentError: mysql_config not found
Google search EnvironmentError: mysql_config not found , Find the answer on stackoverflow

(venv) $ sudo apt-get install libmysqlclient-dev
OK, Enjoy it!!!

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