///

### Langkah 2: buat "instance" dari `FastAPI`

{* ../../docs_src/first_steps/tutorial001.py hl[3] *}

Di sini variabel `app` akan menjadi sebuah "instance" dari class `FastAPI`.

Ini akan menjadi gerbang utama untuk membuat semua API anda.

### Langkah 3: Buat *operasi path*

#### Path

Die meisten dieser Einstellungen sind variabel (können sich ändern), wie z. B. Datenbank-URLs. Und vieles könnten schützenswerte, geheime Daten sein.

Aus diesem Grund werden diese üblicherweise in Umgebungsvariablen bereitgestellt, die von der Anwendung gelesen werden.

চাইলে এই সম্পর্কে আরো বিস্তারিত পড়তে পারেন <a href="https://en.wikipedia.org/wiki/Environment_variable" class="external-link" target="_blank">Wikipedia for Environment Variable</a> এ।

অনেক ক্ষেত্রে, দেখা মাত্রই এনভায়রনমেন্ট ভেরিয়েবল কীভাবে প্রয়োজন হবে  তা স্পষ্ট হয় না। কিন্তু ডেভেলপমেন্টের সময় আপনি নানা রকম পরিস্থিতিতে এগুলোর সম্মুখীন হবেন, তাই এগুলো সম্পর্কে জেনে রাখা ভালো।

   *
   * @param formal The type whose type variables or itself is mapped to other type(s). It's almost
   *     always a bug if {@code formal} isn't a type variable and contains no type variable. Make
   *     sure you are passing the two parameters in the right order.
   * @param actual The type that the formal type variable(s) are mapped to. It can be or contain yet

# Biến môi trường (Environment Variables)

/// tip

Nếu bạn đã biết về "biến môi trường" và cách sử dụng chúng, bạn có thể bỏ qua phần này.

///

Một biến môi trường (còn được gọi là "**env var**") là một biến mà tồn tại **bên ngoài** đoạn mã Python, ở trong **hệ điều hành**, và có thể được đọc bởi đoạn mã Python của bạn (hoặc bởi các chương trình khác).

   *
   * @param formal The type whose type variables or itself is mapped to other type(s). It's almost
   *     always a bug if {@code formal} isn't a type variable and contains no type variable. Make
   *     sure you are passing the two parameters in the right order.
   * @param actual The type that the formal type variable(s) are mapped to. It can be or contain yet

#### Liste

Definieren wir zum Beispiel eine Variable, die eine `list` von `str` – eine Liste von Strings – sein soll.

//// tab | Python 3.9+

Deklarieren Sie die Variable mit der gleichen Doppelpunkt-Syntax (`:`).

Als Typ nehmen Sie `list`.

#### List

Laten we bijvoorbeeld een variabele definiëren als een `list` van `str`.

//// tab | Python 3.9+

Declareer de variabele met dezelfde dubbele punt (`:`) syntax.

Als type, vul `list` in.

Doordat de list een type is dat enkele interne types bevat, zet je ze tussen vierkante haakjes:

     * <li>If <code>type</code> is a wildcard type, its (first) upper bound is returned.</li>
     * <li>If <code>type</code> is a type variable and is a key in the given map, its actual type argument is returned.</li>
     * <li>If <code>type</code> is a type variable and is not a key in the given map, its (first) upper bound is returned.</li>
     * <li>If <code>type</code> is an array, the actual class of its elements is returned.</li>

export MINIO_IDENTITY_LDAP_TLS_SKIP_VERIFY=on
```

### Variable substitution in configuration strings

In the configuration variables, `%s` is substituted with the _username_ from the STS request and `%d` is substituted with the _distinguished username (user DN)_ of the LDAP user. Please see the following table for which configuration variables support these substitution variables:

| Variable                                    | Supported substitutions |