How to set up a virtual environment in python? Steps to build a virtual environment in Python

The content of this article is about how to build a virtual environment in python? The steps to build a virtual environment in Python have certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Question: If you want to develop multiple different projects on one computer, you need to use different versions of the same package. If you use the above command to install or update in the same directory, The new version will overwrite the previous version, and other projects will not be able to run.

Solution: Virtual Environment

Function: Virtual EnvironmentYes Build an independent python operating environment so that the operating environment of a single project does not affect each other.

All virtual environments are located in /home/ Hidden directory under .virtualenvs

2. Build a virtual environment

Install the virtual environment

sudo pip install virtualenv  # 安装虚拟环境
sudo pip install virtualenvwrapper  # 管理虚拟环境

Installation After completing the virtual environment, if you are prompted that the mkvirtualenv command cannot be found, you must configure the environment variables:

# 1、创建目录用来存放虚拟环境
mkdir $HOME/.virtualenvs
# 2、打开~/.bashrc文件，并添加如下：
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh
# 3、运行
source ~/.bashrc

Command to create a virtual environment:
Tips: If you do not specify the python version, it will be installed by default. It is the virtual environment of python2

# 在python2中，创建虚拟环境
mkvirtualenv 虚拟环境名称
# 在python3 中， 创建虚拟环境
mkvirtualenv -p python3 虚拟环境名称

Using the virtual environment

View the command of the virtual environment

workon 两次tab键

The command of using the virtual environment

workon 虚拟环境名称

Command to exit the virtual environment

deactivate

Command to delete the virtual environment

# 先退出再删除，
deactivate
rmvirtualenv 虚拟环境名称

Installing plug-ins in the virtual environment

workon 虚拟环境   # 进入创建的虚拟环境
pip install 安装包的名称   # 安装

View the installation package in the virtual environment

pip freeze

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win7 php environment building tutorial: Detailed explanation of the steps to build php environment under win7

Using virtualenv to build in CentOS python3 environment

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