From 4414286f2c2bfad302dd87637641d635e9a45c00 Mon Sep 17 00:00:00 2001
From: Motov Yurii <109919500+YuriiMotov@users.noreply.github.com>
Date: Wed, 4 Feb 2026 15:33:07 +0300
Subject: [PATCH] =?UTF-8?q?=F0=9F=93=9D=20Update=20embedded=20code=20examp?=
 =?UTF-8?q?les=20to=20Python=203.10=20syntax=20(#14758)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                     | 18 ++++++------------
 docs/en/docs/deployment/docker.md             |  4 +---
 docs/en/docs/index.md                         | 18 ++++++------------
 docs/en/docs/tutorial/body-multiple-params.md | 11 ++++++-----
 4 files changed, 19 insertions(+), 32 deletions(-)

diff --git a/README.md b/README.md
index 1057b86942..963de51edf 100644
--- a/README.md
+++ b/README.md
@@ -164,8 +164,6 @@ $ pip install "fastapi[standard]"
 Create a file `main.py` with:
 
 ```Python
-from typing import Union
-
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -177,7 +175,7 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 ```
 
@@ -186,9 +184,7 @@ def read_item(item_id: int, q: Union[str, None] = None):
 
 If your code uses `async` / `await`, use `async def`:
 
-```Python hl_lines="9  14"
-from typing import Union
-
+```Python hl_lines="7  12"
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -200,7 +196,7 @@ async def read_root():
 
 
 @app.get("/items/{item_id}")
-async def read_item(item_id: int, q: Union[str, None] = None):
+async def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 ```
 
@@ -291,9 +287,7 @@ Now modify the file `main.py` to receive a body from a `PUT` request.
 
 Declare the body using standard Python types, thanks to Pydantic.
 
-```Python hl_lines="4  9-12  25-27"
-from typing import Union
-
+```Python hl_lines="2  7-10 23-25"
 from fastapi import FastAPI
 from pydantic import BaseModel
 
@@ -303,7 +297,7 @@ app = FastAPI()
 class Item(BaseModel):
     name: str
     price: float
-    is_offer: Union[bool, None] = None
+    is_offer: bool | None = None
 
 
 @app.get("/")
@@ -312,7 +306,7 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 
 
diff --git a/docs/en/docs/deployment/docker.md b/docs/en/docs/deployment/docker.md
index 6b71f7360d..7219f3afca 100644
--- a/docs/en/docs/deployment/docker.md
+++ b/docs/en/docs/deployment/docker.md
@@ -145,8 +145,6 @@ There are other formats and tools to define and install package dependencies.
 * Create a `main.py` file with:
 
 ```Python
-from typing import Union
-
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -158,7 +156,7 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 ```
 
diff --git a/docs/en/docs/index.md b/docs/en/docs/index.md
index 5eb47c7b32..ff0f4e9d9d 100644
--- a/docs/en/docs/index.md
+++ b/docs/en/docs/index.md
@@ -161,8 +161,6 @@ $ pip install "fastapi[standard]"
 Create a file `main.py` with:
 
 ```Python
-from typing import Union
-
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -174,7 +172,7 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 ```
 
@@ -183,9 +181,7 @@ def read_item(item_id: int, q: Union[str, None] = None):
 
 If your code uses `async` / `await`, use `async def`:
 
-```Python hl_lines="9  14"
-from typing import Union
-
+```Python hl_lines="7  12"
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -197,7 +193,7 @@ async def read_root():
 
 
 @app.get("/items/{item_id}")
-async def read_item(item_id: int, q: Union[str, None] = None):
+async def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 ```
 
@@ -288,9 +284,7 @@ Now modify the file `main.py` to receive a body from a `PUT` request.
 
 Declare the body using standard Python types, thanks to Pydantic.
 
-```Python hl_lines="4  9-12  25-27"
-from typing import Union
-
+```Python hl_lines="2  7-10 23-25"
 from fastapi import FastAPI
 from pydantic import BaseModel
 
@@ -300,7 +294,7 @@ app = FastAPI()
 class Item(BaseModel):
     name: str
     price: float
-    is_offer: Union[bool, None] = None
+    is_offer: bool | None = None
 
 
 @app.get("/")
@@ -309,7 +303,7 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}
 
 
diff --git a/docs/en/docs/tutorial/body-multiple-params.md b/docs/en/docs/tutorial/body-multiple-params.md
index ed23c81490..bb0c583685 100644
--- a/docs/en/docs/tutorial/body-multiple-params.md
+++ b/docs/en/docs/tutorial/body-multiple-params.md
@@ -102,15 +102,16 @@ Of course, you can also declare additional query parameters whenever you need, a
 
 As, by default, singular values are interpreted as query parameters, you don't have to explicitly add a `Query`, you can just do:
 
+```Python
+q: str | None = None
+```
+
+Or in Python 3.9:
+
 ```Python
 q: Union[str, None] = None
 ```
 
-Or in Python 3.10 and above:
-
-```Python
-q: str | None = None
-```
 
 For example: