pipenv 方便的python 开发工作流工具

pipenv 将 composer、bundler、npm、yarn、cargo 等比较方便的包管理工具添加到了python 语言中，可以
帮助我们自动的管理virtualenv ，同时可以方便的从pipefile 中添加或者移除包

pipenv 解决的问题

• 我们不用在独立的使用pip 以及virualenv ，他们已经可以一起工作了
• 使用requirements.txt 方式管理包是有问题的，因此pipenv 使用pipefile 以及pipefile.lock
• 提供便捷的依赖图（通过 pipenv graph）
• 可以高效的加载.env 文件，方便快发

一个基本使用

• 安装

brew install pipenv

• 初始化一个项目
  python3 环境

pipenv --python 3.7

效果

Creating a virtualenv for this project…
Pipfile: /Users/dalong/mylearning/pipenv-project/Pipfile
Using /usr/local/bin/python3 (3.7.2) to create virtualenv…
⠧ Creating virtual environment...Using base prefix '/usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7'
New python executable in /Users/dalong/.local/share/virtualenvs/pipenv-project-iZJiWFj1/bin/python3.7
Also creating executable in /Users/dalong/.local/share/virtualenvs/pipenv-project-iZJiWFj1/bin/python
Installing setuptools, pip, wheel...
done.
Running virtualenv with interpreter /usr/local/bin/python3

✔ Successfully created virtual environment! 
Virtualenv location: /Users/dalong/.local/share/virtualenvs/pipenv-project-iZJiWFj1
Creating a Pipfile for this project…

• 添加依赖
  tap-mysql

pipenv install tap-mysql

效果

Installing tap-mysql…
Adding tap-mysql to Pipfile's [packages]…
✔ Installation Succeeded 
Pipfile.lock not found, creating…
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
✔ Success! 
Updated Pipfile.lock (430178)!
Installing dependencies from Pipfile.lock (430178)…
  🐍 ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 13/14 — 00:00:00

  🐍 ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 14/14 — 00:00:03
To activate this project's virtualenv, run pipenv shell.
Alternatively, run a command inside the virtualenv with pipenv run.

• 运行安装的tap

pipenv run tap-mysql

• 依赖图
  pipenv graph

tap-mysql==1.10.0
  - attrs [required: ==16.3.0, installed: 16.3.0]
  - backoff [required: ==1.3.2, installed: 1.3.2]
  - mysql-replication [required: ==0.18, installed: 0.18]
    - pymysql [required: Any, installed: 0.7.11]
  - pendulum [required: ==1.2.0, installed: 1.2.0]
    - python-dateutil [required: Any, installed: 2.7.5]
      - six [required: >=1.5, installed: 1.12.0]
    - pytzdata [required: Any, installed: 2018.7]
    - tzlocal [required: Any, installed: 1.5.1]
      - pytz [required: Any, installed: 2018.4]
  - PyMySQL [required: ==0.7.11, installed: 0.7.11]
  - singer-python [required: ==5.3.1, installed: 5.3.1]
    - backoff [required: ==1.3.2, installed: 1.3.2]
    - jsonschema [required: ==2.6.0, installed: 2.6.0]
    - python-dateutil [required: >=2.6.0, installed: 2.7.5]
      - six [required: >=1.5, installed: 1.12.0]
    - pytz [required: ==2018.4, installed: 2018.4]
    - simplejson [required: ==3.11.1, installed: 3.11.1]

说明

pipenv 工具还是很方便的，帮助我们简化了好多实际开发中的问题，在项目中很值得使用

参考资料

https://www.kennethreitz.org/essays/a-better-pip-workflow
https://github.com/pypa/pipenv