new tip

index.md

@@ -511,6 +511,10 @@ This file gets generated by [this script](index.py).
 - [Integer division](notes/20221203175534.md)
 - [Type() vs isinstance()](notes/20240117112801.md)
 
+## Typing
+
+- [You can now use | for typing](notes/20240726111223.md)
+
 ## Unix
 
 - [How to read from standard input (stdin) in python?](notes/20230829192509.md)

notes/20240726111223.md

@@ -0,0 +1,23 @@
+# You can now use | for typing
+
+`|` got added to type hints >= 3.10, not needing the `typing` import anymore:
+
+- Unions can now be written as `X | Y`
+- Optional can now be written as `X | None`
+
+```
+typing import Union, Optional
+
+def func(x: Union[int, str]) -> Optional[int]:
+    pass
+
+
+# >= 3.10
+
+# no more typing import needed
+
+def func(x: int | str) -> int | None:
+    pass
+```
+
+#typing