# パスパラメータ

Pythonのformat文字列と同様のシンタックスで「パスパラメータ」や「パス変数」を宣言できます:

{* ../../docs_src/path_params/tutorial001.py hl[6,7] *}

パスパラメータ `item_id` の値は、引数 `item_id` として関数に渡されます。

しがたって、この例を実行して <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a> にアクセスすると、次のレスポンスが表示されます。

```JSON
{"item_id":"foo"}
```

## パスパラメータと型

標準のPythonの型アノテーションを使用して、関数内のパスパラメータの型を宣言できます:

    private int leaseState;
    private int leaseFlags;
    private long leaseDuration;  // For V2
    private Smb2LeaseKey parentLeaseKey;  // For V2
    private int epoch;  // For V2
    
    // Wire format structure
    // Lease V1: 32 bytes
    // Lease V2: 52 bytes
    
    @Override
    public void encode(byte[] buffer, int offset) {
        // Write context header

      for (char c : input.toCharArray()) {
        if (c >= 0x20 && c <= 0x7E) {
          escapedInput.append(c);
        } else {
          escapedInput.append(String.format("\\u%04x", (int) c));
        }
      }
      fail("FLOATING_POINT_PATTERN should have matched valid input <" + escapedInput + ">");
    }
  }

  @GwtIncompatible // Doubles.tryParse

```Python
    first_name="john", last_name="doe"
```

Het is iets anders.

We gebruiken dubbele punten (`:`), geen gelijkheidstekens (`=`).

Het toevoegen van type hints verandert normaal gesproken niet wat er gebeurt in je programma t.o.v. wat er zonder type hints zou gebeuren.

Maar stel je voor dat je weer bezig bent met het maken van een functie, maar deze keer met type hints.

    void testInitialDataRemaining() {
        // Then
        assertEquals(0, response.getDataRemaining());
    }

    @Test
    @DisplayName("Should write empty bytes to wire format")
    void testWriteBytesWireFormat() {
        // Given
        byte[] buffer = new byte[256];
        int offset = 10;

        // When
        int bytesWritten = response.writeBytesWireFormat(buffer, offset);

            // Verify total bytes written
            assertEquals(48 + data.length, bytesWritten);
        }

        @Test
        @DisplayName("Should handle empty data in wire format")
        void testWriteBytesWireFormatEmptyData() {
            request.setData(new byte[0], 0, 0);

            byte[] buffer = new byte[256];
            int bytesWritten = request.writeBytesWireFormat(buffer, 0);

        if (sessionId == null) { // create session id
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            sessionId = sdf.format(new Date());
        }
        resultBuf.append("Session Id: ").append(sessionId).append("\n");
        resultBuf.append("Web  Config Id:");
        if (webConfigIds == null) {
            if (runAll) {

        int expectedRawSize = Smb2Constants.SMB2_HEADER_LENGTH + 40 + 64;
        int expectedSize = (expectedRawSize + 7) & ~7;
        assertEquals(expectedSize, size);

        // Test wire format writing
        byte[] buffer = new byte[512];
        int bytesWritten = request.writeBytesWireFormat(buffer, 64);

        // Verify all fields in the buffer

        } else {
            cpuLoad = -1;
        }
        final long maxMemory = Runtime.getRuntime().maxMemory();
        final long freeMemory = Runtime.getRuntime().freeMemory();
        final String msg = String.format(
                "%d words from %d %s: {\"time\":{\"parse\":%d,\"index\":%d},\"cpu\":%f,\"mem\":{\"heap\":\"%dmb\",\"used\":\"%dmb\"}}",

labels.searchoptions_menu_labels=Labels
labels.error_title=Error
labels.system_error_title=System Error
labels.contact_site_admin=Please contact your site administrator.
labels.request_error_title=Invalid Request Format.
labels.bad_request=Your request to the URL is invalid.
labels.page_not_found_title=Page Not Found.
labels.check_url=Please check the URL.
labels.user_name=Username
labels.login=Login