From 37fd9f73e2fa439554977cfba427bf94c1fedb6b Mon Sep 17 00:00:00 2001 From: Josh Holland Date: Tue, 13 Aug 2019 20:26:12 +0100 Subject: [PATCH] [3.7] bpo-37814: Document the empty tuple type annotation syntax (GH-15208) (GH-15262) https://bugs.python.org/issue37814: > The empty tuple syntax in type annotations, `Tuple[()]`, is not obvious from the examples given in the documentation (I naively expected `Tuple[]` to work); it has been documented in PEP 484 and in mypy, but not in the documentation for the typing module. https://bugs.python.org/issue37814 (cherry picked from commit 8a784af750fa82c8355903309e5089eb2b60c16b) Co-authored-by: Josh Holland https://bugs.python.org/issue37814 Automerge-Triggered-By: @gvanrossum --- Doc/library/typing.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst index 5adc81c1e3c8..c0b048cb2bd3 100644 --- a/Doc/library/typing.rst +++ b/Doc/library/typing.rst @@ -1056,7 +1056,8 @@ The module defines the following classes, functions and decorators: .. data:: Tuple Tuple type; ``Tuple[X, Y]`` is the type of a tuple of two items - with the first item of type X and the second of type Y. + with the first item of type X and the second of type Y. The type of + the empty tuple can be written as ``Tuple[()]``. Example: ``Tuple[T1, T2]`` is a tuple of two elements corresponding to type variables T1 and T2. ``Tuple[int, float, str]`` is a tuple -- 2.47.3