Converter<StringWrapper, Long> converter = first.andThen(STR_TO_LONG);

    assertEquals(LONG_VAL, converter.convert(new StringWrapper(STR_VAL)));
    assertEquals(STR_VAL, converter.reverse().convert(LONG_VAL).value);

    assertEquals("StringWrapper.andThen(string2long)", converter.toString());

    new EqualsTester()
        .addEqualityGroup(first.andThen(STR_TO_LONG), first.andThen(STR_TO_LONG))
        .testEquals();
  }

You can create dependencies that have **sub-dependencies**.

They can be as **deep** as you need them to be.

**FastAPI** will take care of solving them.

## First dependency "dependable" { #first-dependency-dependable }

You could create a first dependency ("dependable") like:

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[8:9] *}

It declares an optional query parameter `q` as a `str`, and then it just returns it.

     * NDR syntax UUID for DCE/RPC protocol
     */
    UUID DCERPC_UUID_SYNTAX_NDR = new UUID("8a885d04-1ceb-11c9-9fe8-08002b104860");

    /**
     * First fragment flag - indicates first fragment of a multi-fragment message
     */
    int DCERPC_FIRST_FRAG = 0x01; /* First fragment */
    /**
     * Last fragment flag - indicates last fragment of a multi-fragment message
     */
    int DCERPC_LAST_FRAG = 0x02; /* Last fragment */

        buffer.order(ByteOrder.LITTLE_ENDIAN);

        // First notification with nextEntryOffset pointing to second
        int secondOffset = 48;
        buffer.putInt(secondOffset); // nextEntryOffset to second entry
        buffer.putInt(FileNotifyInformation.FILE_ACTION_ADDED);
        String fileName1 = "first.txt";
        byte[] fileNameBytes1 = fileName1.getBytes("UTF-16LE");

	}

	if err = tx.First(&User{}, "name = ?", "transaction").Error; err != nil {
		t.Fatalf("Should find saved record, but got %v", err)
	}

	user1 := *GetUser("transaction1-1", Config{})

	if err = tx.Save(&user1).Error; err != nil {
		t.Fatalf("No error should raise, but got %v", err)
	}

	if err = tx.First(&User{}, "name = ?", user1.Name).Error; err != nil {

		t.Errorf("failed to create user, got error %v", err)
	}

	var user2 User
	DB.First(&user2, user.ID)
	user2.Age = 30
	time.Sleep(time.Second)
	if err := DB.Clauses(clause.OnConflict{UpdateAll: true}).Create(&user2).Error; err != nil {
		t.Fatalf("failed to onconflict create user, got error %v", err)
	} else {
		var user3 User
		DB.First(&user3, user.ID)
		if user3.UpdatedAt.UnixNano() == user2.UpdatedAt.UnixNano() {

	}

	if u, err := gorm.G[User](DB).Select("name").Where("name = ?", user.Name).First(ctx); err != nil {
		t.Fatalf("failed to find user, got error: %v", err)
	} else if u.Name != user.Name || u.Age != 0 {
		t.Errorf("found invalid user, got %v, expect %v", u, user)
	}

	if u, err := gorm.G[User](DB).Omit("name").Where("name = ?", user.Name).First(ctx); err != nil {
		t.Fatalf("failed to find user, got error: %v", err)

    // have this Entry. The value in the map becomes false when this first entry has been copied, so
    // we know not to copy the remaining ones.
    IdentityHashMap<Entry<K, V>, Boolean> duplicates = null;
    int dupCount = 0;
    for (int entryIndex = n - 1; entryIndex >= 0; entryIndex--) {
      // requireNonNull is safe because the first `n` elements have been filled in.

      CertificatePinner
        .Builder()
        .add("first.com", certA1Sha256Pin, certB1Sha256Pin)
        .add("second.com", certC1Sha256Pin)
        .build()

    val expectedPins =
      listOf(
        Pin("first.com", certA1Sha256Pin),
        Pin("first.com", certB1Sha256Pin),
      )
    assertThat(certificatePinner.findMatchingPins("first.com")).isEqualTo(expectedPins)
  }

```Python
if "johndoe" == "stanleyjobson" and "love123" == "swordfish":
    ...
```