Linux下虚拟环境的使用node、python

node.js

node.js的版本管理工具为nvm，镜像地址管理工具为nrm
nvm常用命令：

• nvm ls-remote 查看远程仓库中可用的版本
• nvm install 12.20.1 --default 安装指定版本（并设为默认）
• nvm install --lts 安装最新的LTS
• nvm use 12.20.1
• nvm run default --version 查看默认node的版本

# jesse @ jesse-loptop in ~ [11:33:26] 
$ nvm use 12.20.1
Now using node v12.20.1 (npm v6.14.10)

# jesse @ jesse-loptop in ~ [11:34:01] 
$ nvm run default --version
Running node v12.20.1 (npm v6.14.10)
v12.20.1

# jesse @ jesse-loptop in ~ [11:34:21] 
$ node --version
v12.20.1

添加淘宝npm镜像源：

npm config set registry http://registry.npm.taobao.org/

安装nrm

npm install -g nrm

安装yarn

npm install -g yarn

nrm常用命令

• nrm ls 查看可用的镜像地址
• nrm use taobao 使用taobao镜像

python

python的版本管理工具为pyenv，包管理工具为pipenv

首先，安装python源码的编译环境，然后再进行python的安装

sudo apt install build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev llvm libncurses5-dev libncursesw5-dev tk-dev libffi-dev liblzma-dev libxslt1-dev libsqlite3-dev cmake libgdbm-dev -y

pyenv常用命令

• pyenv install --list 查看远程仓库可用的版本
• pyenv install 3.6.12 安装指定版本
• pyenv global 3.6.12 设置指定版本为默认

配置pip源

pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

pipenv常用命令

• pipenv install

nvm

Example:
  nvm install 8.0.0                     Install a specific version number
  nvm use 8.0                           Use the latest available 8.0.x release
  nvm run 6.10.3 app.js                 Run app.js using node 6.10.3
  nvm exec 4.8.3 node app.js            Run `node app.js` with the PATH pointing to node 4.8.3
  nvm alias default 8.1.0               Set default node version on a shell
  nvm alias default node                Always default to the latest available node version on a shell

  nvm install node                      Install the latest available version
  nvm use node                          Use the latest version
  nvm install --lts                     Install the latest LTS version
  nvm use --lts                         Use the latest LTS version

  nvm set-colors cgYmW                  Set text colors to cyan, green, bold yellow, magenta, and white

Note:
  to remove, delete, or uninstall nvm - just remove the `$NVM_DIR` folder (usually `~/.nvm`)

pipenv

Usage Examples:
   Create a new project using Python 3.7, specifically:
   $ pipenv --python 3.7

   Remove project virtualenv (inferred from current directory):
   $ pipenv --rm

   Install all dependencies for a project (including dev):
   $ pipenv install --dev

   Create a lockfile containing pre-releases:
   $ pipenv lock --pre

   Show a graph of your installed dependencies:
   $ pipenv graph

   Check your installed dependencies for security vulnerabilities:
   $ pipenv check

   Install a local setup.py into your virtual environment/Pipfile:
   $ pipenv install -e .

   Use a lower-level pip command:
   $ pipenv run pip freeze