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"_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://x.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

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Remember I told you before that `Annotated` can be used to add metadata to your parameters in the [Python Types Intro](../python-types.md#type-hints-with-metadata-annotations){.internal-link target=_blank}?

Now it's the time to use it with FastAPI. 🚀

We had this type annotation:

//// tab | Python 3.10+

```Python
q: str | None = None
```

////

//// tab | Python 3.9+

```Python
q: Union[str, None] = None

    /** Property key for SMB1 denied SID entries. */
    public static final String SMB_DENIED_SID_ENTRIES = "smb1DeniedSidEntries";

    /** Property key for SMB1 file creation time. */
    public static final String SMB_CREATE_TIME = "smb1CreateTime";

    /** Property key for SMB1 owner attributes. */
    public static final String SMB_OWNER_ATTRIBUTES = "smb1OwnerAttributes";

    static {

     *
     * @return the negotiateContexts
     */
    public NegotiateContextResponse[] getNegotiateContexts() {
        return this.negotiateContexts;
    }

    /**
     * Gets the server start time timestamp.
     *
     * @return the serverStartTime
     */
    public long getServerStartTime() {
        return this.serverStartTime;
    }

    /**

        assertThrows(IllegalStateException.class, () -> closedAuth.getPasswordAsCharArray());
    }

    /**
     * Test authentication TTL (Time To Live)
     */
    @Test
    @DisplayName("Test authentication TTL expiration")
    public void testAuthenticationTTL() throws InterruptedException {

OAuth2 with scopes is the mechanism used by many big authentication providers, like Facebook, Google, GitHub, Microsoft, X (Twitter), etc. They use it to provide specific permissions to users and applications.

Every time you "log in with" Facebook, Google, GitHub, Microsoft, X (Twitter), that application is using OAuth2 with scopes.

          /*
           * We'll accept that as sufficient "proof" that either equivalence should be able to
           * handle either reference, so it's safe to circumvent compile-time type checking.
           */
          @SuppressWarnings("unchecked")
          Equivalence<Object> equivalence = (Equivalence<Object>) this.equivalence;
          return equivalence.equivalent(this.reference, that.reference);

     * and then to XOR them together.  The strideTable enables us to hash an int followed by 12
     * zero bytes (3 ints), while the byteTable is for advancing one byte at a time.
     * This algorithm is due to the paper "Everything we know about CRC but [are] afraid to forget"
     * by Kadatch and Jenkins, 2010.
     */

    Crc32cHasher() {
      super(16);
    }

  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  
  See here for guidance on getting permanent links to files: https://help.github.com/en/articles/getting-permanent-links-to-files
  
  Please use the following format for linking documentation:

# CL 153670043 runtime: add PauseEnd array to MemStats and GCStats, Jens Frederich <******@****.***>
pkg runtime, type MemStats struct, PauseEnd [256]uint64
pkg runtime/debug, type GCStats struct, PauseEnd []time.Time

# CL 136710045 sync/atomic: add Value, Dmitriy Vyukov <******@****.***>
pkg sync/atomic, method (*Value) Load() interface{}
pkg sync/atomic, method (*Value) Store(interface{})
pkg sync/atomic, type Value struct