Typer: 一个非常好用的命令行应用库
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：
❯ 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
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package
- 全局
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
- 配置多个镜像源
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
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