compat python 3.7

src/psygnal/_dataclass_utils.py

@@ -218,9 +218,9 @@ def iter_fields(
                 if not p_field.frozen or not exclude_frozen:
                     yield field_name, p_field.annotation
         else:
-            for p_field in cls.__fields__.values():
-                if p_field.field_info.allow_mutation or not exclude_frozen:
-                    yield p_field.name, p_field.outer_type_
+            for p_field in cls.__fields__.values():  # type: ignore [attr-defined]
+                if p_field.field_info.allow_mutation or not exclude_frozen:  # type: ignore [attr-defined]
+                    yield p_field.name, p_field.outer_type_  # type: ignore [attr-defined]
         return
 
     attrs_fields = getattr(cls, "__attrs_attrs__", None)
@@ -240,14 +240,15 @@ def iter_fields(
 class FieldOptions:
     name: str
     type_: type | None = None
-    _: KW_ONLY = KW_ONLY  # set the value for compatibility with python < 3.10
+    # set KW_ONLY value for compatibility with python < 3.10
+    _: KW_ONLY = KW_ONLY  # type: ignore [valid-type]
     alias: str | None = None
     skip: bool | None = None
     eq: EqOperator | None = None
     disable_setattr: bool | None = None
 
 
-def is_kw_only(f: Field):
+def is_kw_only(f: Field) -> bool:
     if hasattr(f, "kw_only"):
         return f.kw_only
     # for python < 3.10
@@ -287,7 +288,7 @@ def get_msgspec_metadata(
         single_meta: dict[str, Any] = getattr(meta, "extra", {}).get(
             PSYGNAL_METADATA, {}
         )
-        metadata |= single_meta
+        metadata.update(single_meta)
 
     return type_, metadata
 
@@ -391,13 +392,13 @@ class Foo(BaseModel):
         )
 
         """
-        for p_field in cls.__fields__.values():
-            if p_field.field_info.allow_mutation or not exclude_frozen:
-                meta_dict = getattr(p_field.field_info, "extra", {}).get("metadata", {})
+        for p_field in cls.__fields__.values():  # type: ignore [attr-defined]
+            if p_field.field_info.allow_mutation or not exclude_frozen:  # type: ignore [attr-defined]
+                meta_dict = getattr(p_field.field_info, "extra", {}).get("metadata", {})  # type: ignore [attr-defined]
                 metadata = meta_dict.get(PSYGNAL_METADATA, {})
 
                 metadata = sanitize_field_options_dict(metadata)
-                options = FieldOptions(p_field.name, p_field.outer_type_, **metadata)
+                options = FieldOptions(p_field.name, p_field.outer_type_, **metadata)  # type: ignore [attr-defined]
                 yield options
         return
 

tests/test_custom_fields.py

@@ -1,4 +1,4 @@
-# from __future__ import annotations
+# from __future__ import annotations  # breaks msgspec Annotated
 
 import contextlib
 from typing import ClassVar, Union
@@ -14,7 +14,6 @@
     SignalGroupDescriptor,
 )
 
-# from typing import Annotated  # type: ignore
 Annotated = Union
 with contextlib.suppress(ImportError):
     from typing import Annotated  # type: ignore