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Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/library/typing.rst | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst index 2cfc37f..1780739 100644 --- a/Doc/library/typing.rst +++ b/Doc/library/typing.rst @@ -1041,5 +1041,10 @@ The module defines the following classes, functions and decorators: if TYPE_CHECKING: import expensive_mod - def fun(): - local_var: expensive_mod.some_type = other_fun() + def fun(arg: 'expensive_mod.SomeType') -> None: + local_var: expensive_mod.AnotherType = other_fun() + + Note that the first type annotation must be enclosed in quotes, making it a + "forward reference", to hide the ``expensive_mod`` reference from the + interpreter runtime. Type annotations for local variables are not + evaluated, so the second annotation does not need to be enclosed in quotes. |