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Clarify isinstance(x, Callable). Drop reference to isinstance() implementation.

This commit is contained in:
Guido van Rossum 2015-06-05 08:08:43 -07:00
parent fe4e805109
commit 1f813b8347
1 changed files with 7 additions and 2 deletions
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9
pep-0484.txt
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@ -85,8 +85,8 @@ Non-goals
---------
While the proposed typing module will contain some building blocks for
runtime type checking -- in particular a useful ``isinstance()``
implementation -- third party packages would have to be developed to
runtime type checking -- in particular the `get_type_hints()`
function -- third party packages would have to be developed to
implement specific runtime type checking functionality, for example
using decorators or metaclasses. Using type hints for performance
optimizations is left as an exercise for the reader.
@ -262,6 +262,11 @@ arguments with ``Callable``. Similarly, there is no support for
specifying callback signatures with a variable number of argument of a
specific type.
Because `typing.Callable` does double-duty as a replacement for
`collections.abc.Callable`, `isinstance(x, typing.Callable)` is
implemented by deferring to `isinstance(x, collections.abc.Callable)`.
However, `isinstance(x, typing.Callable[...])` is not supported.
Generics
--------