```Python hl_lines="2"
{!../../docs_src/python_types/tutorial004.py!}
```

## Types declareren

Je hebt net de belangrijkste plek om type hints te declareren gezien. Namelijk als functieparameters.

Dit is ook de belangrijkste plek waar je ze gebruikt met **FastAPI**.

### Eenvoudige types

Je kunt alle standaard Python types declareren, niet alleen `str`.

    assertEquals(
        "next() should still return first element after peeking", "A", peekingIterator.next());

    assertEquals("Should be able to peek() at middle element", "B", peekingIterator.peek());
    assertEquals(
        "Should be able to peek() middle element multiple times", "B", peekingIterator.peek());
    assertEquals(

    assertEquals(
        "next() should still return first element after peeking", "A", peekingIterator.next());

    assertEquals("Should be able to peek() at middle element", "B", peekingIterator.peek());
    assertEquals(
        "Should be able to peek() middle element multiple times", "B", peekingIterator.peek());
    assertEquals(

	doIssueError := true
	isStatic, abi := p.symRefAttrs(name, doIssueError)

	if p.peek() == '+' || p.peek() == '-' {
		a.Offset = int64(p.expr())
	}
	if isStatic {
		a.Sym = p.ctxt.LookupStatic(name)
	} else {
		a.Sym = p.ctxt.LookupABI(name, abi)
	}
	if p.peek() == scanner.EOF {
		if prefix == 0 && p.isJump {
			// Symbols without prefix or suffix are jump labels.
			return
		}

  @CollectionSize.Require(ZERO)
  public void testPeek_empty() {
    assertNull("emptyQueue.peek() should return null", getQueue().peek());
    expectUnchanged();
  }

  @CollectionSize.Require(ONE)
  public void testPeek_size1() {
    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
    expectUnchanged();
  }

  @CollectionFeature.Require(KNOWN_ORDER)

        ) {
          chunked = true
        }
      }

      val peek = dispatcher.peek()
      for (response in peek.informationalResponses) {
        writeHttpResponse(socket, sink, response)
      }

      var hasBody = false
      val policy = dispatcher.peek()
      val requestBodySink =
        requestBody.withThrottlingAndSocketPolicy(
          policy = policy,

    override fun dispatch(request: mockwebserver3.RecordedRequest): mockwebserver3.MockResponse {
      return delegate.dispatch(request.unwrap()).wrap()
    }

    override fun peek(): mockwebserver3.MockResponse {
      return delegate.peek().wrap()
    }

    override fun shutdown() {
      delegate.shutdown()
    }
  }
}

internal fun MockResponse.wrap(): mockwebserver3.MockResponse {

@Throws(EOFException::class)
private fun Buffer.readChallengeHeader(result: MutableList<Challenge>) {
  var peek: String? = null

  while (true) {
    // Read a scheme name for this challenge if we don't have one already.
    if (peek == null) {
      skipCommasAndWhitespace()
      peek = readToken()
      if (peek == null) return
    }

    val schemeName = peek

    // Read a token68, a sequence of parameters, or nothing.

            }
          }
        };

    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.peek());
    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.next());

    assertEquals(1, (int) iter.peek());
    assertEquals(1, (int) iter.next());

    /*
     * We test peek() after various calls to make sure that one bad call doesn't interfere with its

            }
          }
        };

    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.peek());
    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.next());

    assertEquals(1, (int) iter.peek());
    assertEquals(1, (int) iter.next());

    /*
     * We test peek() after various calls to make sure that one bad call doesn't interfere with its