doc: mention allowing T | None

fastapi · Jan 3, 2023 · 447c55f · 447c55f
1 parent 584adbb
commit 447c55f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/tutorial/arguments/optional.md b/docs/tutorial/arguments/optional.md
@@ -108,7 +108,7 @@ Because we are using `typer.Argument()` **Typer** will know that this is a *CLI
 And because the first parameter passed to `typer.Argument(None)` (the new "default" value) is `None`, **Typer** knows that this is an **optional** *CLI argument*, if no value is provided when calling it in the command line, it will have that default value of `None`.
 
 !!! tip
-    By using `Optional` your editor will be able to know that the value *could* be `None`, and will be able to warn you if you do something assuming it is a `str` that would break if it was `None`.
+    By using `Optional` your editor will be able to know that the value *could* be `None`, and will be able to warn you if you do something assuming it is a `str` that would break if it was `None`. If you are using Python 3.10 or newer, you can also use `T | None` instead of `Optional[T]` (e.g., `str | None`).
 
 Check the help: