* ParametricNullness parametric nullness}. Sometimes, code may receive a null {@code T} but store
   * a "null sentinel" to take its place. When the time comes to convert it back to a {@code T} to
   * return to a caller, the code needs to a way to return {@code null} from a method that returns
   * "plain {@code T}." This API provides that.
   */

How to contribute
=================

Thank you so much for wanting to contribute to Guava! Here are a few important
things you should know about contributing:

1.  API changes require discussion, use cases, etc. Code comes later.
2.  Pull requests are great for small fixes for bugs, documentation, etc.
3.  Pull requests are not merged directly into the master branch.
4.  Code contributions require signing a Google CLA.

API changes
-----------

!!! check
    Notice that the value your function received (and returned) is `3`, as a Python `int`, not a string `"3"`.

    So, with that type declaration, **FastAPI** gives you automatic request <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>.

## Data validation

# Update tag on minio2/newbucket when minio1 is down
./mc tag set minio2/newbucket "key=val2"
# create a new bucket on minio2. This should replicate to minio1 after it comes online.
./mc mb minio2/newbucket2
# delete bucket2 on minio2. This should replicate to minio1 after it comes online.
./mc rb minio2/bucket2

# Restart minio1 instance
minio server --address ":9001" --console-address ":10000" /tmp/minio1/{1...4} >/tmp/minio1_1.log 2>&1 &

```JSON
{"item_id":3}
```

!!! check
    👀 👈 💲 👆 🔢 📨 (& 📨) `3`, 🐍 `int`, 🚫 🎻 `"3"`.

    , ⏮️ 👈 🆎 📄, **FastAPI** 🤝 👆 🏧 📨 <abbr title="converting the string that comes from an HTTP request into Python data">"✍"</abbr>.

## 💽 🔬

✋️ 🚥 👆 🚶 🖥 <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, 👆 🔜 👀 👌 🇺🇸🔍 ❌:

# Update tag on minio2/newbucket when minio1 is down
./mc tag set minio2/newbucket "key=val2"
# create a new bucket on minio2. This should replicate to minio1 after it comes online.
./mc mb minio2/newbucket2
# delete bucket2 on minio2. This should replicate to minio1 after it comes online.
./mc rb minio2/bucket2

# Restart minio1 instance

And then another background task generated at the *path operation function* will write a message using the `email` path parameter.

## Technical Details

The class `BackgroundTasks` comes directly from <a href="https://www.starlette.io/background/" class="external-link" target="_blank">`starlette.background`</a>.

and utilities for concurrency, I/O, hashing, primitives, strings, and more! It
is widely used on most Java projects within Google, and widely used by many
other companies as well.



Guava comes in two flavors:

*   The JRE flavor requires JDK 1.8 or higher.
*   If you need support for Android, use
    [the Android flavor](https://github.com/google/guava/wiki/Android). You can

# Update tag on minio2/newbucket when minio1 is down
./mc tag set minio2/newbucket "key=val2"
# create a new bucket on minio2. This should replicate to minio1 after it comes online.
./mc mb minio2/newbucket2

# delete bucket2 on minio2. This should replicate to minio1 after it comes online.
./mc rb minio2/bucket2

# Restart minio1 instance

Mas você pode reordená-los, colocando primeiro o elemento sem o valor padrão (o parâmetro de consulta `q`).

Isso não faz diferença para o **FastAPI**. Ele vai detectar os parâmetros pelos seus nomes, tipos e definições padrão (`Query`, `Path`, etc), sem se importar com a ordem.

Então, você pode declarar sua função assim:

```Python hl_lines="7"
{!../../../docs_src/path_params_numeric_validations/tutorial002.py!}
```