// 'condition' will always be invoked at least once.
//
// Some intervals may be missed if the condition takes too long or the time
// window is too short.
//
// If you want to Poll something forever, see PollInfinite.
//
// Deprecated: This method does not return errors from context, use PollUntilContextTimeout.
// Note that the new method will no longer return ErrWaitTimeout and instead return errors

{!../../../docs_src/python_types/tutorial009.py!}
```

⚙️ `Optional[str]` ↩️ `str` 🔜 ➡️ 👨‍🎨 ℹ 👆 🔍 ❌ 🌐❔ 👆 💪 🤔 👈 💲 🕧 `str`, 🕐❔ ⚫️ 💪 🤙 `None` 💁‍♂️.

`Optional[Something]` 🤙 ⌨ `Union[Something, None]`, 👫 🌓.

👉 ⛓ 👈 🐍 3️⃣.1️⃣0️⃣, 👆 💪 ⚙️ `Something | None`:

=== "🐍 3️⃣.6️⃣ & 🔛"

    ```Python hl_lines="1  4"
    {!> ../../../docs_src/python_types/tutorial009.py!}
    ```

        gradleScript.parentFile.createDir()
        gradleScript.write('something')
        TestFile gradleLauncherJar = explodedZipDir.file('gradle-0.9/lib/gradle-launcher-0.9.jar')
        gradleLauncherJar.parentFile.createDir()
        gradleLauncherJar.write('something')
        explodedZipDir.zipTo(new TestFile(zipDestination))
        explodedZipDir.deleteDir();
    }

        closureOf<MutableList<Int>> { add(42) }.call(list)
        assertEquals(42, list.first())
    }

    @Test
    fun `can use closure with single nullable argument call`() {
        var passedIntoClosure: Any? = "Something non null"
        closureOf<Any?> { passedIntoClosure = this }.call(null)
        assertNull(passedIntoClosure)
    }

    @Test
    fun `can use closure with delegate call`() {
        val list = arrayListOf<Int>()

	{"comment only", "{{/* comment */}}", true},
	{"definition", `{{define "x"}}something{{end}}`, true},
	{"definitions and space", "{{define `x`}}something{{end}}\n\n{{define `y`}}something{{end}}\n\n", true},
	{"definitions and text", "{{define `x`}}something{{end}}\nx\n{{define `y`}}something{{end}}\ny\n", false},
	{"definition and action", "{{define `x`}}something{{end}}{{if 3}}foo{{end}}", false},
}

func TestIsEmpty(t *testing.T) {

    assertEquals(
        "text/plain; something=\"cr@zy\"; something-else=\"crazy with spaces\";"
            + " and-another-thing=\"\"; normal-thing=foo",
        MediaType.create("text", "plain")
            .withParameter("something", "cr@zy")
            .withParameter("something-else", "crazy with spaces")
            .withParameter("and-another-thing", "")

We also saw that HTTPS is normally provided by a component **external** to your application server, a **TLS Termination Proxy**.

And there has to be something in charge of **renewing the HTTPS certificates**, it could be the same component or it could be something different.

### Example Tools for HTTPS

Some of the tools you could use as a TLS Termination Proxy are:

* Traefik

    }

    def "build logic cannot precede plugins block"() {
        when:
        buildScript """
            someThing()
            plugins {}
        """

        then:
        fails "help"

        and:
        failure.assertHasLineNumber 3
        failure.assertHasFileName("Build file '${buildFile}'")

  }

  public void testReadLines_toList() throws IOException {
    TestCharSource lines = new TestCharSource(LINES);
    assertEquals(ImmutableList.of("foo", "bar", "baz", "something"), lines.readLines());
    assertTrue(lines.wasStreamOpened() && lines.wasStreamClosed());
  }

  public void testReadLines_withProcessor() throws IOException {
    TestCharSource lines = new TestCharSource(LINES);

			desc: "setting scheduler extra address arg to something acknowledges it",
			cfg: &kubeadmapi.ClusterConfiguration{
				Scheduler: kubeadmapi.ControlPlaneComponent{
					ExtraArgs: []kubeadmapi.Arg{
						{Name: kubeSchedulerBindAddressArg, Value: "10.10.10.10"},
					},
				},
			},
			expected: "10.10.10.10",
		},
		{
			desc: "setting scheduler extra ipv6 address arg to something acknowledges it",