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documentation for TypeIs#17821

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Merged
JukkaL merged 9 commits intopython:masterfromchelseadz:documentTypeIs
Oct 9, 2024
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fix PEP number, duplicate paragraph and revealed type for int
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chelseadz committedOct 8, 2024
commitc3c9fa981e110890d5741a9217f3ca5849e3ad0a
8 changes: 2 additions & 6 deletionsdocs/source/type_narrowing.rst
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Expand Up@@ -396,7 +396,7 @@ or rewrite the function to be slightly more verbose:
TypeIs
------

Mypy supports TypeIs (:pep:`754`).
Mypy supports TypeIs (:pep:`742`).

A `TypeIs narrowing function <https://typing.readthedocs.io/en/latest/spec/narrowing.html#typeis>`_
allows you to define custom type checks that can narrow the type of a variable
Expand DownExpand Up@@ -448,10 +448,6 @@ Key points:
TypeIs vs TypeGuard
~~~~~~~~~~~~~~~~~~~

While both TypeIs and TypeGuard allow you to define custom type narrowing
functions, they differ in important ways:


While both TypeIs and TypeGuard allow you to define custom type narrowing
functions, they differ in important ways:

Expand DownExpand Up@@ -518,7 +514,7 @@ The type narrowing applies only to the first argument.

def process(x: Any) -> None:
if is_instance_of(x, int):
reveal_type(x) # Revealed type is 'int' or any int subclass
reveal_type(x) # Revealed type is 'int'
print(x + 1) # ok
else:
reveal_type(x) # Revealed type is 'Any'
Expand Down
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