| Name | typer JSON |
| Version |
0.13.1
JSON |
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| home_page | None |
| Summary | Typer, build great CLIs. Easy to code. Based on Python type hints. |
| upload_time | 2024-11-18 22:39:19 |
| maintainer | None |
| docs_url | None |
| author | None |
| requires_python | >=3.7 |
| license | None |
| keywords |
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| VCS |
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| requirements |
No requirements were recorded.
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| Travis-CI |
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<p align="center">
<a href="https://typer.tiangolo.com"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg#only-light" alt="Typer"></a>
</p>
<p align="center">
<em>Typer, build great CLIs. Easy to code. Based on Python type hints.</em>
</p>
<p align="center">
<a href="https://github.com/fastapi/typer/actions?query=workflow%3ATest" target="_blank">
<img src="https://github.com/fastapi/typer/workflows/Test/badge.svg" alt="Test">
</a>
<a href="https://github.com/fastapi/typer/actions?query=workflow%3APublish" target="_blank">
<img src="https://github.com/fastapi/typer/workflows/Publish/badge.svg" alt="Publish">
</a>
<a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/typer" target="_blank">
<img src="https://coverage-badge.samuelcolvin.workers.dev/fastapi/typer.svg" alt="Coverage">
<a href="https://pypi.org/project/typer" target="_blank">
<img src="https://img.shields.io/pypi/v/typer?color=%2334D058&label=pypi%20package" alt="Package version">
</a>
</p>
---
**Documentation**: <a href="https://typer.tiangolo.com" target="_blank">https://typer.tiangolo.com</a>
**Source Code**: <a href="https://github.com/fastapi/typer" target="_blank">https://github.com/fastapi/typer</a>
---
Typer is a library for building <abbr title="command line interface, programs executed from a terminal">CLI</abbr> applications that users will **love using** and developers will **love creating**. Based on Python type hints.
It's also a command line tool to run scripts, automatically converting them to CLI applications.
The key features are:
* **Intuitive to write**: Great editor support. <abbr title="also known as auto-complete, autocompletion, IntelliSense">Completion</abbr> 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.
* **Run scripts**: Typer includes a `typer` command/program that you can use to run scripts, automatically converting them to CLIs, even if they don't use Typer internally.
## FastAPI of CLIs
**Typer** is <a href="https://fastapi.tiangolo.com" class="external-link" target="_blank">FastAPI</a>'s little sibling, it's the FastAPI of CLIs.
## Installation
Create and activate a <a href="https://typer.tiangolo.com/virtual-environments/" class="external-link" target="_blank">virtual environment</a> and then install **Typer**:
<div class="termy">
```console
$ pip install typer
---> 100%
Successfully installed typer rich shellingham
```
</div>
## Example
### The absolute minimum
* Create a file `main.py` with:
```Python
def main(name: str):
print(f"Hello {name}")
```
This script doesn't even use Typer internally. But you can use the `typer` command to run it as a CLI application.
### Run it
Run your application with the `typer` command:
<div class="termy">
```console
// Run your application
$ typer main.py run
// You get a nice error, you are missing NAME
Usage: typer [PATH_OR_MODULE] run [OPTIONS] NAME
Try 'typer [PATH_OR_MODULE] run --help' for help.
╭─ Error ───────────────────────────────────────────╮
│ Missing argument 'NAME'. │
╰───────────────────────────────────────────────────╯
// You get a --help for free
$ typer main.py run --help
Usage: typer [PATH_OR_MODULE] run [OPTIONS] NAME
Run the provided Typer app.
╭─ Arguments ───────────────────────────────────────╮
│ * name TEXT [default: None] [required] |
╰───────────────────────────────────────────────────╯
╭─ Options ─────────────────────────────────────────╮
│ --help Show this message and exit. │
╰───────────────────────────────────────────────────╯
// Now pass the NAME argument
$ typer main.py run Camila
Hello Camila
// It works! 🎉
```
</div>
This is the simplest use case, not even using Typer internally, but it can already be quite useful for simple scripts.
**Note**: auto-completion works when you create a Python package and run it with `--install-completion` or when you use the `typer` command.
## Use Typer in your code
Now let's start using Typer in your own code, update `main.py` with:
```Python
import typer
def main(name: str):
print(f"Hello {name}")
if __name__ == "__main__":
typer.run(main)
```
Now you could run it with Python directly:
<div class="termy">
```console
// Run your application
$ python main.py
// You get a nice error, you are missing NAME
Usage: main.py [OPTIONS] NAME
Try 'main.py --help' for help.
╭─ Error ───────────────────────────────────────────╮
│ Missing argument 'NAME'. │
╰───────────────────────────────────────────────────╯
// You get a --help for free
$ python main.py --help
Usage: main.py [OPTIONS] NAME
╭─ Arguments ───────────────────────────────────────╮
│ * name TEXT [default: None] [required] |
╰───────────────────────────────────────────────────╯
╭─ Options ─────────────────────────────────────────╮
│ --help Show this message and exit. │
╰───────────────────────────────────────────────────╯
// Now pass the NAME argument
$ python main.py Camila
Hello Camila
// It works! 🎉
```
</div>
**Note**: you can also call this same script with the `typer` command, but you don't need to.
## Example upgrade
This was the simplest example possible.
Now let's see one a bit more complex.
### An example with two subcommands
Modify the file `main.py`.
Create a `typer.Typer()` app, and create two subcommands with their parameters.
```Python hl_lines="3 6 11 20"
import typer
app = typer.Typer()
@app.command()
def hello(name: str):
print(f"Hello {name}")
@app.command()
def goodbye(name: str, formal: bool = False):
if formal:
print(f"Goodbye Ms. {name}. Have a good day.")
else:
print(f"Bye {name}!")
if __name__ == "__main__":
app()
```
And that will:
* Explicitly create a `typer.Typer` app.
* The previous `typer.run` actually creates one implicitly for you.
* Add two subcommands with `@app.command()`.
* Execute the `app()` itself, as if it was a function (instead of `typer.run`).
### Run the upgraded example
Check the new help:
<div class="termy">
```console
$ python main.py --help
Usage: main.py [OPTIONS] COMMAND [ARGS]...
╭─ Options ─────────────────────────────────────────╮
│ --install-completion Install completion │
│ for the current │
│ shell. │
│ --show-completion Show completion for │
│ the current shell, │
│ to copy it or │
│ customize the │
│ installation. │
│ --help Show this message │
│ and exit. │
╰───────────────────────────────────────────────────╯
╭─ Commands ────────────────────────────────────────╮
│ goodbye │
│ hello │
╰───────────────────────────────────────────────────╯
// When you create a package you get ✨ auto-completion ✨ for free, installed with --install-completion
// You have 2 subcommands (the 2 functions): goodbye and hello
```
</div>
Now check the help for the `hello` command:
<div class="termy">
```console
$ python main.py hello --help
Usage: main.py hello [OPTIONS] NAME
╭─ Arguments ───────────────────────────────────────╮
│ * name TEXT [default: None] [required] │
╰───────────────────────────────────────────────────╯
╭─ Options ─────────────────────────────────────────╮
│ --help Show this message and exit. │
╰───────────────────────────────────────────────────╯
```
</div>
And now check the help for the `goodbye` command:
<div class="termy">
```console
$ python main.py goodbye --help
Usage: main.py goodbye [OPTIONS] NAME
╭─ Arguments ───────────────────────────────────────╮
│ * name TEXT [default: None] [required] │
╰───────────────────────────────────────────────────╯
╭─ Options ─────────────────────────────────────────╮
│ --formal --no-formal [default: no-formal] │
│ --help Show this message │
│ and exit. │
╰───────────────────────────────────────────────────╯
// Automatic --formal and --no-formal for the bool option 🎉
```
</div>
Now you can try out the new command line application:
<div class="termy">
```console
// Use it with the hello command
$ python main.py hello Camila
Hello Camila
// And with the goodbye command
$ python main.py goodbye Camila
Bye Camila!
// And with --formal
$ python main.py goodbye --formal Camila
Goodbye Ms. Camila. Have a good day.
```
</div>
### Recap
In summary, you declare **once** the types of parameters (*CLI arguments* and *CLI options*) as function parameters.
You do that with standard modern Python types.
You don't have to learn a new syntax, the methods or classes of a specific library, etc.
Just standard **Python**.
For example, for an `int`:
```Python
total: int
```
or for a `bool` flag:
```Python
force: bool
```
And similarly for **files**, **paths**, **enums** (choices), etc. And there are tools to create **groups of subcommands**, add metadata, extra **validation**, etc.
**You get**: great editor support, including **completion** and **type checks** everywhere.
**Your users get**: automatic **`--help`**, **auto-completion** in their terminal (Bash, Zsh, Fish, PowerShell) when they install your package or when using the `typer` command.
For a more complete example including more features, see the <a href="https://typer.tiangolo.com/tutorial/">Tutorial - User Guide</a>.
## Dependencies
**Typer** stands on the shoulders of a giant. Its only internal required dependency is <a href="https://click.palletsprojects.com/" class="external-link" target="_blank">Click</a>.
By default it also comes with extra standard dependencies:
* <a href="https://rich.readthedocs.io/en/stable/index.html" class="external-link" target="_blank"><code>rich</code></a>: to show nicely formatted errors automatically.
* <a href="https://github.com/sarugaku/shellingham" class="external-link" target="_blank"><code>shellingham</code></a>: to automatically detect the current shell when installing completion.
* With `shellingham` you can just use `--install-completion`.
* Without `shellingham`, you have to pass the name of the shell to install completion for, e.g. `--install-completion bash`.
### `typer-slim`
If you don't want the extra standard optional dependencies, install `typer-slim` instead.
When you install with:
```bash
pip install typer
```
...it includes the same code and dependencies as:
```bash
pip install "typer-slim[standard]"
```
The `standard` extra dependencies are `rich` and `shellingham`.
**Note**: The `typer` command is only included in the `typer` package.
## License
This project is licensed under the terms of the MIT license.
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"description": "<p align=\"center\">\n <a href=\"https://typer.tiangolo.com\"><img src=\"https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg#only-light\" alt=\"Typer\"></a>\n\n</p>\n<p align=\"center\">\n <em>Typer, build great CLIs. Easy to code. Based on Python type hints.</em>\n</p>\n<p align=\"center\">\n<a href=\"https://github.com/fastapi/typer/actions?query=workflow%3ATest\" target=\"_blank\">\n <img src=\"https://github.com/fastapi/typer/workflows/Test/badge.svg\" alt=\"Test\">\n</a>\n<a href=\"https://github.com/fastapi/typer/actions?query=workflow%3APublish\" target=\"_blank\">\n <img src=\"https://github.com/fastapi/typer/workflows/Publish/badge.svg\" alt=\"Publish\">\n</a>\n<a href=\"https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/typer\" target=\"_blank\">\n <img src=\"https://coverage-badge.samuelcolvin.workers.dev/fastapi/typer.svg\" alt=\"Coverage\">\n<a href=\"https://pypi.org/project/typer\" target=\"_blank\">\n <img src=\"https://img.shields.io/pypi/v/typer?color=%2334D058&label=pypi%20package\" alt=\"Package version\">\n</a>\n</p>\n\n---\n\n**Documentation**: <a href=\"https://typer.tiangolo.com\" target=\"_blank\">https://typer.tiangolo.com</a>\n\n**Source Code**: <a href=\"https://github.com/fastapi/typer\" target=\"_blank\">https://github.com/fastapi/typer</a>\n\n---\n\nTyper is a library for building <abbr title=\"command line interface, programs executed from a terminal\">CLI</abbr> applications that users will **love using** and developers will **love creating**. Based on Python type hints.\n\nIt's also a command line tool to run scripts, automatically converting them to CLI applications.\n\nThe key features are:\n\n* **Intuitive to write**: Great editor support. <abbr title=\"also known as auto-complete, autocompletion, IntelliSense\">Completion</abbr> everywhere. Less time debugging. Designed to be easy to use and learn. Less time reading docs.\n* **Easy to use**: It's easy to use for the final users. Automatic help, and automatic completion for all shells.\n* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.\n* **Start simple**: The simplest example adds only 2 lines of code to your app: **1 import, 1 function call**.\n* **Grow large**: Grow in complexity as much as you want, create arbitrarily complex trees of commands and groups of subcommands, with options and arguments.\n* **Run scripts**: Typer includes a `typer` command/program that you can use to run scripts, automatically converting them to CLIs, even if they don't use Typer internally.\n\n## FastAPI of CLIs\n\n**Typer** is <a href=\"https://fastapi.tiangolo.com\" class=\"external-link\" target=\"_blank\">FastAPI</a>'s little sibling, it's the FastAPI of CLIs.\n\n## Installation\n\nCreate and activate a <a href=\"https://typer.tiangolo.com/virtual-environments/\" class=\"external-link\" target=\"_blank\">virtual environment</a> and then install **Typer**:\n\n<div class=\"termy\">\n\n```console\n$ pip install typer\n---> 100%\nSuccessfully installed typer rich shellingham\n```\n\n</div>\n\n## Example\n\n### The absolute minimum\n\n* Create a file `main.py` with:\n\n```Python\ndef main(name: str):\n print(f\"Hello {name}\")\n```\n\nThis script doesn't even use Typer internally. But you can use the `typer` command to run it as a CLI application.\n\n### Run it\n\nRun your application with the `typer` command:\n\n<div class=\"termy\">\n\n```console\n// Run your application\n$ typer main.py run\n\n// You get a nice error, you are missing NAME\nUsage: typer [PATH_OR_MODULE] run [OPTIONS] NAME\nTry 'typer [PATH_OR_MODULE] run --help' for help.\n\u256d\u2500 Error \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 Missing argument 'NAME'. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n\n// You get a --help for free\n$ typer main.py run --help\n\nUsage: typer [PATH_OR_MODULE] run [OPTIONS] NAME\n\nRun the provided Typer app.\n\n\u256d\u2500 Arguments \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 * name TEXT [default: None] [required] |\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\u256d\u2500 Options \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 --help Show this message and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n// Now pass the NAME argument\n$ typer main.py run Camila\n\nHello Camila\n\n// It works! \ud83c\udf89\n```\n\n</div>\n\nThis is the simplest use case, not even using Typer internally, but it can already be quite useful for simple scripts.\n\n**Note**: auto-completion works when you create a Python package and run it with `--install-completion` or when you use the `typer` command.\n\n## Use Typer in your code\n\nNow let's start using Typer in your own code, update `main.py` with:\n\n```Python\nimport typer\n\n\ndef main(name: str):\n print(f\"Hello {name}\")\n\n\nif __name__ == \"__main__\":\n typer.run(main)\n```\n\nNow you could run it with Python directly:\n\n<div class=\"termy\">\n\n```console\n// Run your application\n$ python main.py\n\n// You get a nice error, you are missing NAME\nUsage: main.py [OPTIONS] NAME\nTry 'main.py --help' for help.\n\u256d\u2500 Error \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 Missing argument 'NAME'. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n\n// You get a --help for free\n$ python main.py --help\n\nUsage: main.py [OPTIONS] NAME\n\n\u256d\u2500 Arguments \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 * name TEXT [default: None] [required] |\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\u256d\u2500 Options \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 --help Show this message and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n// Now pass the NAME argument\n$ python main.py Camila\n\nHello Camila\n\n// It works! \ud83c\udf89\n```\n\n</div>\n\n**Note**: you can also call this same script with the `typer` command, but you don't need to.\n\n## Example upgrade\n\nThis was the simplest example possible.\n\nNow let's see one a bit more complex.\n\n### An example with two subcommands\n\nModify the file `main.py`.\n\nCreate a `typer.Typer()` app, and create two subcommands with their parameters.\n\n```Python hl_lines=\"3 6 11 20\"\nimport typer\n\napp = typer.Typer()\n\n\n@app.command()\ndef hello(name: str):\n print(f\"Hello {name}\")\n\n\n@app.command()\ndef goodbye(name: str, formal: bool = False):\n if formal:\n print(f\"Goodbye Ms. {name}. Have a good day.\")\n else:\n print(f\"Bye {name}!\")\n\n\nif __name__ == \"__main__\":\n app()\n```\n\nAnd that will:\n\n* Explicitly create a `typer.Typer` app.\n * The previous `typer.run` actually creates one implicitly for you.\n* Add two subcommands with `@app.command()`.\n* Execute the `app()` itself, as if it was a function (instead of `typer.run`).\n\n### Run the upgraded example\n\nCheck the new help:\n\n<div class=\"termy\">\n\n```console\n$ python main.py --help\n\n Usage: main.py [OPTIONS] COMMAND [ARGS]...\n\n\u256d\u2500 Options \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 --install-completion Install completion \u2502\n\u2502 for the current \u2502\n\u2502 shell. \u2502\n\u2502 --show-completion Show completion for \u2502\n\u2502 the current shell, \u2502\n\u2502 to copy it or \u2502\n\u2502 customize the \u2502\n\u2502 installation. \u2502\n\u2502 --help Show this message \u2502\n\u2502 and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\u256d\u2500 Commands \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 goodbye \u2502\n\u2502 hello \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n// When you create a package you get \u2728 auto-completion \u2728 for free, installed with --install-completion\n\n// You have 2 subcommands (the 2 functions): goodbye and hello\n```\n\n</div>\n\nNow check the help for the `hello` command:\n\n<div class=\"termy\">\n\n```console\n$ python main.py hello --help\n\n Usage: main.py hello [OPTIONS] NAME\n\n\u256d\u2500 Arguments \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 * name TEXT [default: None] [required] \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\u256d\u2500 Options \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 --help Show this message and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n```\n\n</div>\n\nAnd now check the help for the `goodbye` command:\n\n<div class=\"termy\">\n\n```console\n$ python main.py goodbye --help\n\n Usage: main.py goodbye [OPTIONS] NAME\n\n\u256d\u2500 Arguments \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 * name TEXT [default: None] [required] \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\u256d\u2500 Options \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256e\n\u2502 --formal --no-formal [default: no-formal] \u2502\n\u2502 --help Show this message \u2502\n\u2502 and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n\n// Automatic --formal and --no-formal for the bool option \ud83c\udf89\n```\n\n</div>\n\nNow you can try out the new command line application:\n\n<div class=\"termy\">\n\n```console\n// Use it with the hello command\n\n$ python main.py hello Camila\n\nHello Camila\n\n// And with the goodbye command\n\n$ python main.py goodbye Camila\n\nBye Camila!\n\n// And with --formal\n\n$ python main.py goodbye --formal Camila\n\nGoodbye Ms. Camila. Have a good day.\n```\n\n</div>\n\n### Recap\n\nIn summary, you declare **once** the types of parameters (*CLI arguments* and *CLI options*) as function parameters.\n\nYou do that with standard modern Python types.\n\nYou don't have to learn a new syntax, the methods or classes of a specific library, etc.\n\nJust standard **Python**.\n\nFor example, for an `int`:\n\n```Python\ntotal: int\n```\n\nor for a `bool` flag:\n\n```Python\nforce: bool\n```\n\nAnd similarly for **files**, **paths**, **enums** (choices), etc. And there are tools to create **groups of subcommands**, add metadata, extra **validation**, etc.\n\n**You get**: great editor support, including **completion** and **type checks** everywhere.\n\n**Your users get**: automatic **`--help`**, **auto-completion** in their terminal (Bash, Zsh, Fish, PowerShell) when they install your package or when using the `typer` command.\n\nFor a more complete example including more features, see the <a href=\"https://typer.tiangolo.com/tutorial/\">Tutorial - User Guide</a>.\n\n## Dependencies\n\n**Typer** stands on the shoulders of a giant. Its only internal required dependency is <a href=\"https://click.palletsprojects.com/\" class=\"external-link\" target=\"_blank\">Click</a>.\n\nBy default it also comes with extra standard dependencies:\n\n* <a href=\"https://rich.readthedocs.io/en/stable/index.html\" class=\"external-link\" target=\"_blank\"><code>rich</code></a>: to show nicely formatted errors automatically.\n* <a href=\"https://github.com/sarugaku/shellingham\" class=\"external-link\" target=\"_blank\"><code>shellingham</code></a>: to automatically detect the current shell when installing completion.\n * With `shellingham` you can just use `--install-completion`.\n * Without `shellingham`, you have to pass the name of the shell to install completion for, e.g. `--install-completion bash`.\n\n### `typer-slim`\n\nIf you don't want the extra standard optional dependencies, install `typer-slim` instead.\n\nWhen you install with:\n\n```bash\npip install typer\n```\n\n...it includes the same code and dependencies as:\n\n```bash\npip install \"typer-slim[standard]\"\n```\n\nThe `standard` extra dependencies are `rich` and `shellingham`.\n\n**Note**: The `typer` command is only included in the `typer` package.\n\n## License\n\nThis project is licensed under the terms of the MIT license.\n",
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