理解pipenv in Python

• Prerequisite

  《理解Pipfile vs. setup.py || applications vs. libraries》

• Pipenv (Homepage)

  requests作者 K e n R e i t z Ken Reitz KenReitz发布于2017.1.22.

  Windows is a first-class citizen, in our world.

  Pipenv is a tool that aims to bring the best of all packaging worlds (bundler, composer, npm, cargo, yern, etc.) to the Python world.

  It harnesses Pipfile, pip, and virtualenv into one single toolchain.

  It automatically creates and manages a virtualenv for you projects, as well as adds/removes packages from your Pipfile as you install/uninstall packages. It also generates the ever important Pipfile.lock, which is used to produce deterministic builds.

  Pipenv is primarily meant to provide users and developers of applications with an easy method to setup a working environment.

  Pipenv 集成包管理+虚拟环境,通过Pipfile,Pipfile.lock以实现.针对虚拟环境,不再需要activate and deactivate

• Installing Pipenv

  pipx

  pipenv

  pip install --user pipx 
  pipx ensurepath
  pipx install pipenv 
  

• 基础用法

  详情参见：

  《Announcing Pipenv!》

  《Basic Usage if Pipenv》

  Pipenv & Virtual Environments

  Pipenv CLI Reference

  Pipenv manages dependencies on a per-project basis. To install packages, change into your projects’s directory (or just an empty directory for this tutorial) and run:

  cd project_folder
  pipenv install requests
  pipenv shell # activate environment
  touch script.py
  pipenv run python script.py
  pipenv uninstall <package>
  pipenv --rm # remove the virtualenv
  

  Pipenv will install requests library and create a Pipfile for you in your project’s directory. The Pipfile is used to track which dependencies your project needs in case you need to re-install them, such as when you share your projects with others.

  If it already has a requirements.txt file, it will generate a Pipfile file with the requirements and a virtual environment folder, otherwise, it will generate an empty Pipfile file.

  If you disliked or changed your mind about somthing that you have installed:

  pipenv uninstall <package>

  To activate the virtual environment that pipenv generated:

  pipenv shell

  to leave the environment:

  exit

  Using pipenv run ensures that your installed packages are available to your scripts. It’s also possible to spawn a new shell that ensures all commands have access to your installed packages with pipenv shell.

• References

1. How are Pipfile and Pipfile.lock used?