diff --git a/src/hamcrest/core/assert_that.py b/src/hamcrest/core/assert_that.py
index a31cf3a..c594068 100644
--- a/src/hamcrest/core/assert_that.py
+++ b/src/hamcrest/core/assert_that.py
@@ -16,13 +16,11 @@
 
 
 @overload
-def assert_that(actual_or_assertion: T, matcher: Matcher[T], reason: str = "") -> None:
-    ...
+def assert_that(actual_or_assertion: T, matcher: Matcher[T], reason: str = "") -> None: ...
 
 
 @overload
-def assert_that(actual_or_assertion: bool, reason: str = "") -> None:
-    ...
+def assert_that(actual_or_assertion: bool, reason: str = "") -> None: ...
 
 
 def assert_that(actual_or_assertion, matcher=None, reason=""):
diff --git a/src/hamcrest/core/core/is_.py b/src/hamcrest/core/core/is_.py
index dafe41c..da3c6b6 100644
--- a/src/hamcrest/core/core/is_.py
+++ b/src/hamcrest/core/core/is_.py
@@ -29,13 +29,11 @@ def describe_to(self, description: Description):
 
 
 @overload
-def _wrap_value_or_type(x: Type) -> Matcher[object]:
-    ...
+def _wrap_value_or_type(x: Type) -> Matcher[object]: ...
 
 
 @overload
-def _wrap_value_or_type(x: T) -> Matcher[T]:
-    ...
+def _wrap_value_or_type(x: T) -> Matcher[T]: ...
 
 
 def _wrap_value_or_type(x):
@@ -46,18 +44,15 @@ def _wrap_value_or_type(x):
 
 
 @overload
-def is_(x: Type) -> Matcher[Any]:
-    ...
+def is_(x: Type) -> Matcher[Any]: ...
 
 
 @overload
-def is_(x: Matcher[T]) -> Matcher[T]:
-    ...
+def is_(x: Matcher[T]) -> Matcher[T]: ...
 
 
 @overload
-def is_(x: T) -> Matcher[T]:
-    ...
+def is_(x: T) -> Matcher[T]: ...
 
 
 def is_(x):
diff --git a/src/hamcrest/core/core/isnot.py b/src/hamcrest/core/core/isnot.py
index de26f68..74abbaf 100644
--- a/src/hamcrest/core/core/isnot.py
+++ b/src/hamcrest/core/core/isnot.py
@@ -30,13 +30,11 @@ def describe_mismatch(self, item: T, mismatch_description: Description) -> None:
 
 
 @overload
-def _wrap_value_or_type(x: Type) -> Matcher[object]:
-    ...
+def _wrap_value_or_type(x: Type) -> Matcher[object]: ...
 
 
 @overload
-def _wrap_value_or_type(x: T) -> Matcher[T]:
-    ...
+def _wrap_value_or_type(x: T) -> Matcher[T]: ...
 
 
 def _wrap_value_or_type(x):
@@ -47,13 +45,11 @@ def _wrap_value_or_type(x):
 
 
 @overload
-def is_not(match: Type) -> Matcher[object]:
-    ...
+def is_not(match: Type) -> Matcher[object]: ...
 
 
 @overload
-def is_not(match: Union[Matcher[T], T]) -> Matcher[T]:
-    ...
+def is_not(match: Union[Matcher[T], T]) -> Matcher[T]: ...
 
 
 def is_not(match):
diff --git a/src/hamcrest/library/collection/__init__.py b/src/hamcrest/library/collection/__init__.py
index bf07a66..dbbd02b 100644
--- a/src/hamcrest/library/collection/__init__.py
+++ b/src/hamcrest/library/collection/__init__.py
@@ -1,4 +1,5 @@
 """Matchers of collections."""
+
 from .is_empty import empty
 from .isdict_containing import has_entry
 from .isdict_containingentries import has_entries
diff --git a/src/hamcrest/library/collection/isdict_containingentries.py b/src/hamcrest/library/collection/isdict_containingentries.py
index 79341ff..fffa82c 100644
--- a/src/hamcrest/library/collection/isdict_containingentries.py
+++ b/src/hamcrest/library/collection/isdict_containingentries.py
@@ -73,20 +73,17 @@ def describe_to(self, description: Description) -> None:
 
 # Keyword argument form
 @overload
-def has_entries(**keys_valuematchers: Union[Matcher[V], V]) -> Matcher[Mapping[str, V]]:
-    ...
+def has_entries(**keys_valuematchers: Union[Matcher[V], V]) -> Matcher[Mapping[str, V]]: ...
 
 
 # Key to matcher dict form
 @overload
-def has_entries(keys_valuematchers: Mapping[K, Union[Matcher[V], V]]) -> Matcher[Mapping[K, V]]:
-    ...
+def has_entries(keys_valuematchers: Mapping[K, Union[Matcher[V], V]]) -> Matcher[Mapping[K, V]]: ...
 
 
 # Alternating key/matcher form
 @overload
-def has_entries(*keys_valuematchers: Any) -> Matcher[Mapping[Any, Any]]:
-    ...
+def has_entries(*keys_valuematchers: Any) -> Matcher[Mapping[Any, Any]]: ...
 
 
 def has_entries(*keys_valuematchers, **kv_args):
diff --git a/src/hamcrest/library/number/iscloseto.py b/src/hamcrest/library/number/iscloseto.py
index 579eeb8..83f4d8c 100644
--- a/src/hamcrest/library/number/iscloseto.py
+++ b/src/hamcrest/library/number/iscloseto.py
@@ -62,13 +62,11 @@ def describe_to(self, description: Description) -> None:
 
 
 @overload
-def close_to(value: float, delta: float) -> Matcher[float]:
-    ...
+def close_to(value: float, delta: float) -> Matcher[float]: ...
 
 
 @overload
-def close_to(value: Decimal, delta: Decimal) -> Matcher[Decimal]:
-    ...
+def close_to(value: Decimal, delta: Decimal) -> Matcher[Decimal]: ...
 
 
 def close_to(value, delta):
diff --git a/src/hamcrest/library/object/hasproperty.py b/src/hamcrest/library/object/hasproperty.py
index ea2519f..e65ff92 100644
--- a/src/hamcrest/library/object/hasproperty.py
+++ b/src/hamcrest/library/object/hasproperty.py
@@ -94,20 +94,17 @@ def has_property(name: str, match: Union[None, Matcher[V], V] = None) -> Matcher
 
 # Keyword argument form
 @overload
-def has_properties(**keys_valuematchers: Union[Matcher[V], V]) -> Matcher[Any]:
-    ...
+def has_properties(**keys_valuematchers: Union[Matcher[V], V]) -> Matcher[Any]: ...
 
 
 # Name to matcher dict form
 @overload
-def has_properties(keys_valuematchers: Mapping[str, Union[Matcher[V], V]]) -> Matcher[Any]:
-    ...
+def has_properties(keys_valuematchers: Mapping[str, Union[Matcher[V], V]]) -> Matcher[Any]: ...
 
 
 # Alternating name/matcher form
 @overload
-def has_properties(*keys_valuematchers: Any) -> Matcher[Any]:
-    ...
+def has_properties(*keys_valuematchers: Any) -> Matcher[Any]: ...
 
 
 def has_properties(*keys_valuematchers, **kv_args):
diff --git a/src/hamcrest/library/text/substringmatcher.py b/src/hamcrest/library/text/substringmatcher.py
index ec7874c..a222d25 100644
--- a/src/hamcrest/library/text/substringmatcher.py
+++ b/src/hamcrest/library/text/substringmatcher.py
@@ -20,5 +20,4 @@ def describe_to(self, description: Description) -> None:
         ).append_description_of(self.substring)
 
     @abstractmethod
-    def relationship(self):
-        ...
+    def relationship(self): ...