Using virtualenv to manage the Python environment __python

virtualenv Introduction

A tool to create a stand-alone virtual python environment. problem solved application of the Python version inconsistency application dependent module version inconsistency application version inconsistency virtualenv installation using PIP installation (Pip 1.3+)

Pip Install Virtualenv

virtualenv Use Creating an environment

$ virtualenv ENV

Where the env is the environment directory.

Common parameter Description:

Parameters	Description
–version	View Program version
-H,--help	Help information
-V,--verbose	More information
-Q,--quiet	Reduce information
-P Python_exe,--python=python_exe	Set the environment Python version, such as –python=python2.5
--clear	Clear the non-root user installation
--system-site-packages	Using Global Packages
--no-site-packages	Deprecated, default options
--extra-search-dir	Search Directory for Expansion packs

Activating the Environment

$ source Bin/activate

Undo Environment

$ deactivate

Remove Environment

(ENV) $ deactivate
$ rm-r/path/to/env

configuration file

Unix/linux Directory: $HOME/.virtualenv/virtualenv.ini
Windows Catalog:%appdata%\virtualenv\virtualenv.ini

[Virtualenv]
Python =/opt/python-3.3/bin/python
extra-search-dir =
    /path/to/dists
    /path/to/other/dists

Virtualenvwrapper

For ease of use, you can also install Virtualenvwrapper with PIP, extending the virtualenv. function: consolidate all virtual environments in one directory manage (add, remove, replicate) Virtual Environment Fast switch virtual Environment installation Method

Pip Install Virtualenvwrapper

Create a directory to store a virtual environment

Mkvirtualenv-p Python3 py3env

Other common commands

Deactivate                # Exit the current virtual environment
Workon [virtual Environment name]       # Use a virtual environment
rmvirtualenv [virtual Environment name] # to delete a virtual environment
Lsvirtualenv              # List all virtual environments

Package Management Export Package List

Pip freeze-l > Packages.txt

installation Package List

Pip Install-r packages.txt

using Virtual environments in Pycharm

File-setting-project Interpreter-add Local

Reference:
Virtualenv GitHub
Virtualenv Docs
Virtualenvwrapper Docs