{!../../docs_src/python_types/tutorial009c.py!}
```

Der Parameter `name` ist definiert als `Optional[str]`, aber er ist **nicht optional**, Sie können die Funktion nicht ohne diesen Parameter aufrufen:

```Python
say_hi()  # Oh, nein, das löst einen Fehler aus! 😱
```

Der `name` Parameter wird **immer noch benötigt** (nicht *optional*), weil er keinen Default-Wert hat. `name` akzeptiert aber dennoch `None` als Wert:

```Python

) {
	if h.forceStarted {
		_, apiErr = ahs.stopHealSequence(pathJoin(h.bucket, h.object))
		if apiErr.Code != "" {
			return respBytes, apiErr, ""
		}
	} else {
		oh, exists := ahs.getHealSequence(pathJoin(h.bucket, h.object))
		if exists && !oh.hasEnded() {
			errMsg = "Heal is already running on the given path " +
				"(use force-start option to stop and start afresh). " +

🖼, ➡️ ✊ 👉 🔢:

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial009c.py!}
```

🔢 `name` 🔬 `Optional[str]`, ✋️ ⚫️ **🚫 📦**, 👆 🚫🔜 🤙 🔢 🍵 🔢:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

`name` 🔢 **✔** (🚫 *📦*) ↩️ ⚫️ 🚫 ✔️ 🔢 💲. , `name` 🚫 `None` 💲:

```Python
say_hi(name=None)  # This works, None is valid 🎉
```

                        break;
                    case 'b':
                        out.append('\b');
                        break;
                    case 'u':
                        // uh-oh, we're in unicode country....
                        inUnicode = true;
                        break;
                    default:
                        out.append(ch);
                        break;

{!../../docs_src/python_types/tutorial009c.py!}
```

O paâmetro `name` é definido como `Optional[str]`, mas ele **não é opcional**, você não pode chamar a função sem o parâmetro:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

O parâmetro `name` **ainda é obrigatório** (não *opicional*) porque ele não possui um valor padrão. Mesmo assim, `name` aceita `None` como valor:

```Python

{!../../docs_src/python_types/tutorial009c.py!}
```

De parameter `name` is gedefinieerd als `Optional[str]`, maar is **niet optioneel**, je kunt de functie niet aanroepen zonder de parameter:

```Python
say_hi()  # Oh, nee, dit geeft een foutmelding! 😱
```

De `name` parameter is **nog steeds vereist** (niet *optioneel*) omdat het geen standaardwaarde heeft. Toch accepteert `name` `None` als waarde:

```Python

{* ../../docs_src/python_types/tutorial009c.py hl[1,4] *}

The parameter `name` is defined as `Optional[str]`, but it is **not optional**, you cannot call the function without the parameter:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

The `name` parameter is **still required** (not *optional*) because it doesn't have a default value. Still, `name` accepts `None` as the value:

```Python

        }
        off += r;
        totalLen += r;
      }
    }

    // read MAX_ARRAY_LEN bytes without seeing end of stream
    if (in.read() == -1) {
      // oh, there's the end of the stream
      return combineBuffers(bufs, MAX_ARRAY_LEN);
    } else {
      throw new OutOfMemoryError("input is too large to fit in a byte array");
    }
  }

{!../../docs_src/python_types/tutorial009c.py!}
```

Tham số `name` được định nghĩa là `Optional[str]`, nhưng nó **không phải là tùy chọn**, bạn không thể gọi hàm mà không có tham số:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

Tham số `name` **vẫn được yêu cầu** (không phải là *tùy chọn*) vì nó không có giá trị mặc định. Trong khi đó, `name` chấp nhận `None` như là giá trị:

```Python

cc.ga.us cc.gu.us cc.hi.us cc.hn cc.ia.us cc.id.us cc.il.us cc.in.us cc.ks.us cc.ky.us cc.la.us cc.ma.us cc.md.us cc.me.us cc.mi.us cc.mn.us cc.mo.us cc.ms.us cc.mt.us cc.na cc.nc.us cc.nd.us cc.ne.us cc.nh.us cc.nj.us cc.nm.us cc.nv.us cc.ny.us cc.oh.us cc.ok.us cc.or.us cc.pa.us cc.pr.us cc.ri.us cc.sc.us cc.sd.us cc.tn.us cc.tx.us cc.ua cc.ut.us cc.va.us cc.vi.us cc.vt.us cc.wa.us cc.wi.us cc.wv.us cc.wy.us cci.fr cd cd.eu.org cdn-edges.net cdn.prod.atlassian-dev.net cdn77-ssl.net ce.gov.br ce.it...