--- /dev/null
+
+{!../../../docs/missing-translation.md!}
+
+
+<p align="center">
+ <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
+</p>
+<p align="center">
+ <em>FastAPI framework, high performance, easy to learn, fast to code, ready for production</em>
+</p>
+<p align="center">
+<a href="https://github.com/tiangolo/fastapi/actions?query=workflow%3ATest" target="_blank">
+ <img src="https://github.com/tiangolo/fastapi/workflows/Test/badge.svg" alt="Test">
+</a>
+<a href="https://codecov.io/gh/tiangolo/fastapi" target="_blank">
+ <img src="https://img.shields.io/codecov/c/github/tiangolo/fastapi?color=%2334D058" alt="Coverage">
+</a>
+<a href="https://pypi.org/project/fastapi" target="_blank">
+ <img src="https://img.shields.io/pypi/v/fastapi?color=%2334D058&label=pypi%20package" alt="Package version">
+</a>
+<a href="https://gitter.im/tiangolo/fastapi?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge" target="_blank">
+ <img src="https://badges.gitter.im/tiangolo/fastapi.svg" alt="Join the chat at https://gitter.im/tiangolo/fastapi">
+</a>
+</p>
+
+---
+
+**Documentation**: <a href="https://fastapi.tiangolo.com" target="_blank">https://fastapi.tiangolo.com</a>
+
+**Source Code**: <a href="https://github.com/tiangolo/fastapi" target="_blank">https://github.com/tiangolo/fastapi</a>
+
+---
+
+FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.
+
+The key features are:
+
+* **Fast**: Very high performance, on par with **NodeJS** and **Go** (thanks to Starlette and Pydantic). [One of the fastest Python frameworks available](#performance).
+
+* **Fast to code**: Increase the speed to develop features by about 200% to 300%. *
+* **Fewer bugs**: Reduce about 40% of human (developer) induced errors. *
+* **Intuitive**: Great editor support. <abbr title="also known as auto-complete, autocompletion, IntelliSense">Completion</abbr> everywhere. Less time debugging.
+* **Easy**: Designed to be easy to use and learn. Less time reading docs.
+* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.
+* **Robust**: Get production-ready code. With automatic interactive documentation.
+* **Standards-based**: Based on (and fully compatible with) the open standards for APIs: <a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank">OpenAPI</a> (previously known as Swagger) and <a href="http://json-schema.org/" class="external-link" target="_blank">JSON Schema</a>.
+
+<small>* estimation based on tests on an internal development team, building production applications.</small>
+
+## Opinions
+
+"_[...] I'm using **FastAPI** a ton these days. [...] I'm actually planning to use it for all of my team's **ML services at Microsoft**. Some of them are getting integrated into the core **Windows** product and some **Office** products._"
+
+<div style="text-align: right; margin-right: 10%;">Kabir Khan - <strong>Microsoft</strong> <a href="https://github.com/tiangolo/fastapi/pull/26" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+"_We adopted the **FastAPI** library to spawn a **REST** server that can be queried to obtain **predictions**. [for Ludwig]_"
+
+<div style="text-align: right; margin-right: 10%;">Piero Molino, Yaroslav Dudin, and Sai Sumanth Miryala - <strong>Uber</strong> <a href="https://eng.uber.com/ludwig-v0-2/" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+"_**Netflix** is pleased to announce the open-source release of our **crisis management** orchestration framework: **Dispatch**! [built with **FastAPI**]_"
+
+<div style="text-align: right; margin-right: 10%;">Kevin Glisson, Marc Vilanova, Forest Monsen - <strong>Netflix</strong> <a href="https://netflixtechblog.com/introducing-dispatch-da4b8a2a8072" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+"_I’m over the moon excited about **FastAPI**. It’s so fun!_"
+
+<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+"_Honestly, what you've built looks super solid and polished. In many ways, it's what I wanted **Hug** to be - it's really inspiring to see someone build that._"
+
+<div style="text-align: right; margin-right: 10%;">Timothy Crosley - <strong><a href="http://www.hug.rest/" target="_blank">Hug</a> creator</strong> <a href="https://news.ycombinator.com/item?id=19455465" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+"_If you're looking to learn one **modern framework** for building REST APIs, check out **FastAPI** [...] It's fast, easy to use and easy to learn [...]_"
+
+"_We've switched over to **FastAPI** for our **APIs** [...] I think you'll like it [...]_"
+
+<div style="text-align: right; margin-right: 10%;">Ines Montani - Matthew Honnibal - <strong><a href="https://explosion.ai" target="_blank">Explosion AI</a> founders - <a href="https://spacy.io" target="_blank">spaCy</a> creators</strong> <a href="https://twitter.com/_inesmontani/status/1144173225322143744" target="_blank"><small>(ref)</small></a> - <a href="https://twitter.com/honnibal/status/1144031421859655680" target="_blank"><small>(ref)</small></a></div>
+
+---
+
+## **Typer**, the FastAPI of CLIs
+
+<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>
+
+If you are building a <abbr title="Command Line Interface">CLI</abbr> app to be used in the terminal instead of a web API, check out <a href="https://typer.tiangolo.com/" class="external-link" target="_blank">**Typer**</a>.
+
+**Typer** is FastAPI's little sibling. And it's intended to be the **FastAPI of CLIs**. ⌨️ 🚀
+
+## Requirements
+
+Python 3.6+
+
+FastAPI stands on the shoulders of giants:
+
+* <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> for the web parts.
+* <a href="https://pydantic-docs.helpmanual.io/" class="external-link" target="_blank">Pydantic</a> for the data parts.
+
+## Installation
+
+<div class="termy">
+
+```console
+$ pip install fastapi
+
+---> 100%
+```
+
+</div>
+
+You will also need an ASGI server, for production such as <a href="http://www.uvicorn.org" class="external-link" target="_blank">Uvicorn</a> or <a href="https://gitlab.com/pgjones/hypercorn" class="external-link" target="_blank">Hypercorn</a>.
+
+<div class="termy">
+
+```console
+$ pip install uvicorn
+
+---> 100%
+```
+
+</div>
+
+## Example
+
+### Create it
+
+* Create a file `main.py` with:
+
+```Python
+from typing import Optional
+
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+def read_root():
+ return {"Hello": "World"}
+
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: Optional[str] = None):
+ return {"item_id": item_id, "q": q}
+```
+
+<details markdown="1">
+<summary>Or use <code>async def</code>...</summary>
+
+If your code uses `async` / `await`, use `async def`:
+
+```Python hl_lines="9 14"
+from typing import Optional
+
+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/")
+async def read_root():
+ return {"Hello": "World"}
+
+
+@app.get("/items/{item_id}")
+async def read_item(item_id: int, q: Optional[str] = None):
+ return {"item_id": item_id, "q": q}
+```
+
+**Note**:
+
+If you don't know, check the _"In a hurry?"_ section about <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` and `await` in the docs</a>.
+
+</details>
+
+### Run it
+
+Run the server with:
+
+<div class="termy">
+
+```console
+$ uvicorn main:app --reload
+
+INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
+INFO: Started reloader process [28720]
+INFO: Started server process [28722]
+INFO: Waiting for application startup.
+INFO: Application startup complete.
+```
+
+</div>
+
+<details markdown="1">
+<summary>About the command <code>uvicorn main:app --reload</code>...</summary>
+
+The command `uvicorn main:app` refers to:
+
+* `main`: the file `main.py` (the Python "module").
+* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
+* `--reload`: make the server restart after code changes. Only do this for development.
+
+</details>
+
+### Check it
+
+Open your browser at <a href="http://127.0.0.1:8000/items/5?q=somequery" class="external-link" target="_blank">http://127.0.0.1:8000/items/5?q=somequery</a>.
+
+You will see the JSON response as:
+
+```JSON
+{"item_id": 5, "q": "somequery"}
+```
+
+You already created an API that:
+
+* Receives HTTP requests in the _paths_ `/` and `/items/{item_id}`.
+* Both _paths_ take `GET` <em>operations</em> (also known as HTTP _methods_).
+* The _path_ `/items/{item_id}` has a _path parameter_ `item_id` that should be an `int`.
+* The _path_ `/items/{item_id}` has an optional `str` _query parameter_ `q`.
+
+### Interactive API docs
+
+Now go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.
+
+You will see the automatic interactive API documentation (provided by <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank">Swagger UI</a>):
+
+
+
+### Alternative API docs
+
+And now, go to <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.
+
+You will see the alternative automatic documentation (provided by <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):
+
+
+
+## Example upgrade
+
+Now modify the file `main.py` to receive a body from a `PUT` request.
+
+Declare the body using standard Python types, thanks to Pydantic.
+
+```Python hl_lines="4 9 10 11 12 25 26 27"
+from typing import Optional
+
+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+ name: str
+ price: float
+ is_offer: Optional[bool] = None
+
+
+@app.get("/")
+def read_root():
+ return {"Hello": "World"}
+
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: Optional[str] = None):
+ return {"item_id": item_id, "q": q}
+
+
+@app.put("/items/{item_id}")
+def update_item(item_id: int, item: Item):
+ return {"item_name": item.name, "item_id": item_id}
+```
+
+The server should reload automatically (because you added `--reload` to the `uvicorn` command above).
+
+### Interactive API docs upgrade
+
+Now go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.
+
+* The interactive API documentation will be automatically updated, including the new body:
+
+
+
+* Click on the button "Try it out", it allows you to fill the parameters and directly interact with the API:
+
+
+
+* Then click on the "Execute" button, the user interface will communicate with your API, send the parameters, get the results and show them on the screen:
+
+
+
+### Alternative API docs upgrade
+
+And now, go to <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.
+
+* The alternative documentation will also reflect the new query parameter and body:
+
+
+
+### Recap
+
+In summary, you declare **once** the types of parameters, body, etc. 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 3.6+**.
+
+For example, for an `int`:
+
+```Python
+item_id: int
+```
+
+or for a more complex `Item` model:
+
+```Python
+item: Item
+```
+
+...and with that single declaration you get:
+
+* Editor support, including:
+ * Completion.
+ * Type checks.
+* Validation of data:
+ * Automatic and clear errors when the data is invalid.
+ * Validation even for deeply nested JSON objects.
+* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of input data: coming from the network to Python data and types. Reading from:
+ * JSON.
+ * Path parameters.
+ * Query parameters.
+ * Cookies.
+ * Headers.
+ * Forms.
+ * Files.
+* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of output data: converting from Python data and types to network data (as JSON):
+ * Convert Python types (`str`, `int`, `float`, `bool`, `list`, etc).
+ * `datetime` objects.
+ * `UUID` objects.
+ * Database models.
+ * ...and many more.
+* Automatic interactive API documentation, including 2 alternative user interfaces:
+ * Swagger UI.
+ * ReDoc.
+
+---
+
+Coming back to the previous code example, **FastAPI** will:
+
+* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
+* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
+ * If it is not, the client will see a useful, clear error.
+* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.
+ * As the `q` parameter is declared with `= None`, it is optional.
+ * Without the `None` it would be required (as is the body in the case with `PUT`).
+* For `PUT` requests to `/items/{item_id}`, Read the body as JSON:
+ * Check that it has a required attribute `name` that should be a `str`.
+ * Check that it has a required attribute `price` that has to be a `float`.
+ * Check that it has an optional attribute `is_offer`, that should be a `bool`, if present.
+ * All this would also work for deeply nested JSON objects.
+* Convert from and to JSON automatically.
+* Document everything with OpenAPI, that can be used by:
+ * Interactive documentation systems.
+ * Automatic client code generation systems, for many languages.
+* Provide 2 interactive documentation web interfaces directly.
+
+---
+
+We just scratched the surface, but you already get the idea of how it all works.
+
+Try changing the line with:
+
+```Python
+ return {"item_name": item.name, "item_id": item_id}
+```
+
+...from:
+
+```Python
+ ... "item_name": item.name ...
+```
+
+...to:
+
+```Python
+ ... "item_price": item.price ...
+```
+
+...and see how your editor will auto-complete the attributes and know their types:
+
+
+
+For a more complete example including more features, see the <a href="https://fastapi.tiangolo.com/tutorial/">Tutorial - User Guide</a>.
+
+**Spoiler alert**: the tutorial - user guide includes:
+
+* Declaration of **parameters** from other different places as: **headers**, **cookies**, **form fields** and **files**.
+* How to set **validation constraints** as `maximum_length` or `regex`.
+* A very powerful and easy to use **<abbr title="also known as components, resources, providers, services, injectables">Dependency Injection</abbr>** system.
+* Security and authentication, including support for **OAuth2** with **JWT tokens** and **HTTP Basic** auth.
+* More advanced (but equally easy) techniques for declaring **deeply nested JSON models** (thanks to Pydantic).
+* Many extra features (thanks to Starlette) as:
+ * **WebSockets**
+ * **GraphQL**
+ * extremely easy tests based on `requests` and `pytest`
+ * **CORS**
+ * **Cookie Sessions**
+ * ...and more.
+
+## Performance
+
+Independent TechEmpower benchmarks show **FastAPI** applications running under Uvicorn as <a href="https://www.techempower.com/benchmarks/#section=test&runid=7464e520-0dc2-473d-bd34-dbdfd7e85911&hw=ph&test=query&l=zijzen-7" class="external-link" target="_blank">one of the fastest Python frameworks available</a>, only below Starlette and Uvicorn themselves (used internally by FastAPI). (*)
+
+To understand more about it, see the section <a href="https://fastapi.tiangolo.com/benchmarks/" class="internal-link" target="_blank">Benchmarks</a>.
+
+## Optional Dependencies
+
+Used by Pydantic:
+
+* <a href="https://github.com/esnme/ultrajson" target="_blank"><code>ujson</code></a> - for faster JSON <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>.
+* <a href="https://github.com/JoshData/python-email-validator" target="_blank"><code>email_validator</code></a> - for email validation.
+
+Used by Starlette:
+
+* <a href="http://docs.python-requests.org" target="_blank"><code>requests</code></a> - Required if you want to use the `TestClient`.
+* <a href="https://github.com/Tinche/aiofiles" target="_blank"><code>aiofiles</code></a> - Required if you want to use `FileResponse` or `StaticFiles`.
+* <a href="http://jinja.pocoo.org" target="_blank"><code>jinja2</code></a> - Required if you want to use the default template configuration.
+* <a href="https://andrew-d.github.io/python-multipart/" target="_blank"><code>python-multipart</code></a> - Required if you want to support form <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>, with `request.form()`.
+* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Required for `SessionMiddleware` support.
+* <a href="https://pyyaml.org/wiki/PyYAMLDocumentation" target="_blank"><code>pyyaml</code></a> - Required for Starlette's `SchemaGenerator` support (you probably don't need it with FastAPI).
+* <a href="https://graphene-python.org/" target="_blank"><code>graphene</code></a> - Required for `GraphQLApp` support.
+* <a href="https://github.com/esnme/ultrajson" target="_blank"><code>ujson</code></a> - Required if you want to use `UJSONResponse`.
+
+Used by FastAPI / Starlette:
+
+* <a href="http://www.uvicorn.org" target="_blank"><code>uvicorn</code></a> - for the server that loads and serves your application.
+* <a href="https://github.com/ijl/orjson" target="_blank"><code>orjson</code></a> - Required if you want to use `ORJSONResponse`.
+
+You can install all of these with `pip install fastapi[all]`.
+
+## License
+
+This project is licensed under the terms of the MIT license.
projects / thirdparty / fastapi / fastapi.git / commitdiff
