Cosmetic changes, run black

src/graphql/execution/middleware.py

@@ -20,7 +20,8 @@ class MiddlewareManager:
     must be aware of this and check whether values are awaitable before awaiting them.
     """
 
-    __slots__ = "__weakref__", "__dict__", "middlewares", "_middleware_resolvers", "_cached_resolvers"
+    # allow custom attributes (not used internally)
+    __slots__ = "__dict__", "middlewares", "_middleware_resolvers", "_cached_resolvers"
 
     _cached_resolvers: Dict[GraphQLFieldResolver, GraphQLFieldResolver]
     _middleware_resolvers: Optional[List[Callable]]

src/graphql/language/ast.py

@@ -72,7 +72,7 @@ class Token:
     Represents a range of characters represented by a lexical token within a Source.
     """
 
-    __slots__ = ("kind", "start", "end", "line", "column", "prev", "next", "value")
+    __slots__ = "kind", "start", "end", "line", "column", "prev", "next", "value"
 
     kind: TokenKind  # the kind of token
     start: int  # the character offset at which this Node begins
@@ -162,7 +162,13 @@ class Location:
     region of the source from which the AST derived.
     """
 
-    __slots__ = ("start", "end", "start_token", "end_token", "source")
+    __slots__ = (
+        "start",
+        "end",
+        "start_token",
+        "end_token",
+        "source",
+    )
 
     start: int  # character offset at which this Node begins
     end: int  # character offset at which this Node ends
@@ -214,7 +220,8 @@ class OperationType(Enum):
 class Node:
     """AST nodes"""
 
-    __slots__ = ("__dict__", "__weakref__", "loc",)
+    # allow custom attributes and weak references (not used internally)
+    __slots__ = "__dict__", "__weakref__", "loc"
 
     loc: Optional[Location]
 

src/graphql/language/source.py

@@ -6,6 +6,7 @@
 class Source:
     """A representation of source input to GraphQL."""
 
+    # allow custom attributes and weak references (not used internally)
     __slots__ = "__weakref__", "__dict__", "body", "name", "location_offset"
 
     def __init__(

tests/language/test_ast.py

@@ -187,6 +187,16 @@ def can_hash():
         assert node3 != node
         assert hash(node3) != hash(node)
 
+    def can_create_weak_reference():
+        node = SampleTestNode(alpha=1, beta=2)
+        ref = weakref.ref(node)
+        assert ref() is node
+
+    def can_create_custom_attribute():
+        node = SampleTestNode(alpha=1, beta=2)
+        node.gamma = 3  # type: ignore
+        assert node.gamma == 3  # type: ignore
+
     def can_create_shallow_copy():
         node = SampleTestNode(alpha=1, beta=2)
         node2 = copy(node)
@@ -225,13 +235,3 @@ class Foo(Node):
 
     def provides_keys_as_class_attribute():
         assert SampleTestNode.keys == ["loc", "alpha", "beta"]
-
-    def can_weakref():
-        node = SampleTestNode(alpha=1, beta=2)
-        wr = weakref.ref(node)  # That this works is 90% of the test
-        assert wr() is node
-
-    def can_make_attrs():
-        node = SampleTestNode(alpha=1, beta=2)
-        node.__new_random_attr = "Hello!"  # That this works is 90% of the test
-        assert node.__new_random_attr == "Hello!"

tests/language/test_source.py

@@ -1,3 +1,5 @@
+import weakref
+
 from pytest import raises  # type: ignore
 
 from graphql.language import Source, SourceLocation
@@ -63,6 +65,16 @@ def can_be_compared():
         assert not source == "bar"
         assert source != "bar"
 
+    def can_create_weak_reference():
+        source = Source("foo")
+        ref = weakref.ref(source)
+        assert ref() is source
+
+    def can_create_custom_attribute():
+        node = Source("foo")
+        node.custom = "bar"  # type: ignore
+        assert node.custom == "bar"  # type: ignore
+
     def rejects_invalid_body_and_name():
         with raises(TypeError, match="body must be a string\\."):
             # noinspection PyTypeChecker