0340; COMBINING GRAVE TONE MARK
   0341; COMBINING ACUTE TONE MARK
   200E; LEFT-TO-RIGHT MARK
   200F; RIGHT-TO-LEFT MARK
   202A; LEFT-TO-RIGHT EMBEDDING
   202B; RIGHT-TO-LEFT EMBEDDING
   202C; POP DIRECTIONAL FORMATTING
   202D; LEFT-TO-RIGHT OVERRIDE
   202E; RIGHT-TO-LEFT OVERRIDE
   206A; INHIBIT SYMMETRIC SWAPPING
   206B; ACTIVATE SYMMETRIC SWAPPING
   206C; INHIBIT ARABIC FORM SHAPING
   206D; ACTIVATE ARABIC FORM SHAPING

  The Fish-Footman began by producing from under his arm a great
letter, nearly as large as himself, and this he handed over to
the other, saying, in a solemn tone, `For the Duchess.  An
invitation from the Queen to play croquet.'  The Frog-Footman
repeated, in the same solemn tone, only changing the order of the
words a little, `From the Queen.  An invitation for the Duchess
to play croquet.'

  The Fish-Footman began by producing from under his arm a great
letter, nearly as large as himself, and this he handed over to
the other, saying, in a solemn tone, `For the Duchess.  An
invitation from the Queen to play croquet.'  The Frog-Footman
repeated, in the same solemn tone, only changing the order of the
words a little, `From the Queen.  An invitation for the Duchess
to play croquet.'

    assertThat(stringPrep("\u2ffb")).isNull()
  }

  @Test fun prohibitionChangeDisplayPropertiesOrDeprecated() {
    assertThat(stringPrep("\u0340")).isNull() // COMBINING GRAVE TONE MARK
    assertThat(stringPrep("\u200e")).isNull() // LEFT-TO-RIGHT MARK
    assertThat(stringPrep("\u206e")).isNull() // NATIONAL DIGIT SHAPES
    assertThat(stringPrep("\u206f")).isNull() // NOMINAL DIGIT SHAPES
  }

02E5..02E9    ; valid                  ;      ; NV8    # 1.1  MODIFIER LETTER EXTRA-HIGH TONE BAR..MODIFIER LETTER EXTRA-LOW TONE BAR
02EA..02EB    ; valid                  ;      ; NV8    # 3.0  MODIFIER LETTER YIN DEPARTING TONE MARK..MODIFIER LETTER YANG DEPARTING TONE MARK
02EC          ; valid                                  # 3.0  MODIFIER LETTER VOICING

```Python hl_lines="7"
{!../../../docs_src/query_params_str_validations/tutorial005.py!}
```

!!! note "Observação"
    O parâmetro torna-se opcional quando possui um valor padrão.

## Torne-o obrigatório

Quando você não necessita de validações ou de metadados adicionais, podemos fazer com que o parâmetro de consulta `q` seja obrigatório por não declarar um valor padrão, dessa forma:

```Python
q: str

tomari.hokkaido.jp tome.miyagi.jp tomi.nagano.jp tomigusuku.okinawa.jp tomika.gifu.jp tomioka.gunma.jp tomisato.chiba.jp tomiya.miyagi.jp tomobe.ibaraki.jp tonaki.okinawa.jp tonami.toyama.jp tondabayashi.osaka.jp tone.ibaraki.jp tonkotsu.jp tono.iwate.jp tonosho.kagawa.jp tonsberg.no toolforge.org tools toon.ehime.jp top topology.museum torahime.shiga.jp toray toride.ibaraki.jp torino.it torino.museum torproject.net torsken.no tos.it tosa.kochi.jp tosashimizu.kochi.jp toscana.it toshiba toshima.tokyo.jp tosu.saga.jp...

shitara.aichi.jp
tahara.aichi.jp
takahama.aichi.jp
tobishima.aichi.jp
toei.aichi.jp
togo.aichi.jp
tokai.aichi.jp
tokoname.aichi.jp
toyoake.aichi.jp
toyohashi.aichi.jp
toyokawa.aichi.jp
toyone.aichi.jp
toyota.aichi.jp
tsushima.aichi.jp
yatomi.aichi.jp
akita.akita.jp
daisen.akita.jp
fujisato.akita.jp
gojome.akita.jp
hachirogata.akita.jp
happou.akita.jp
higashinaruse.akita.jp

He, Sandeep Dcunha, sandipmgiri, Sang Han, scott, Scott Mudge, Se-Won Kim, Simon
Perkins, Simone Cirillo, Steffen Schmitz, Suvojit Manna, Sylvus, Taehoon Lee,
Ted Chang, Thomas Deegan, Till Hoffmann, Tim, Toni Kunic, Toon Verstraelen,
Tristan Rice, Urs KöSter, Utkarsh Upadhyay, Vish (Ishaya) Abrams, Winnie Tsang,
Yan Chen, Yan Facai (颜发才), Yi Yang, Yong Tang, Youssef Hesham, Yuan (Terry)
Tang, Zhengsheng Wei, zxcqwe4906, 张志豪, 田传武