Typer: 一个非常好用的命令行应用库

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Typer, build great CLIs. Easy to code. Based on Python type hints.

今天偶然看到GitHub上一个python开源项目——Typer，可以帮助简单快速地构建命令行应用。正如介绍所说，“users will love using and developers will love creating”。

The key features are:

  • Intuitive to write: Great editor support. Completion everywhere. Less time debugging. Designed to be easy to use and learn. Less time reading docs.

  • Easy to use: It’s easy to use for the final users. Automatic help, and automatic completion for all shells.

  • Short: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.

  • Start simple: The simplest example adds only 2 lines of code to your app: 1 import, 1 function call.

  • Grow large: Grow in complexity as much as you want, create arbitrarily complex trees of commands and groups of subcommands, with options and arguments.

Typer算是出身名门，跟很火的快速web框架FastAPI同一开发团队，是FastAPI的小兄弟，旨在成为CLI中的FastAPI。

安装

Typer需要Python 3.6+。

安装过程很丝滑：

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❯ pip install "typer[all]"
---> 100%
Successfully installed typer

建议大家给pip更换清华源，快的不是一星半点。

  • 临时
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pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package
  • 全局
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pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
  • 配置多个镜像源
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pip config set global.extra-index-url "<url1> <url2>..."

注意源地址间有空格，可用pypi镜像源列表：https://mirrors.cernet.edu.cn/list/pypi