chore: fix mypy issue for __func__ type

.github/workflows/tests.yaml

@@ -405,13 +405,13 @@ jobs:
       - name: Install nox.
         run: |
             python -m pip install nox
-      - name: Run blacken and lint on the generated output.
+      - name: Run format, lint, and mypy on the generated output.
         run: |
-          nox -f tests/integration/goldens/asset/noxfile.py -s mypy-${{ env.LATEST_STABLE_PYTHON }} blacken lint
-          nox -f tests/integration/goldens/credentials/noxfile.py -s mypy-${{ env.LATEST_STABLE_PYTHON }} blacken lint
-          nox -f tests/integration/goldens/eventarc/noxfile.py -s mypy-${{ env.LATEST_STABLE_PYTHON }} blacken lint
-          nox -f tests/integration/goldens/logging/noxfile.py -s mypy-${{ env.LATEST_STABLE_PYTHON }} blacken lint
-          nox -f tests/integration/goldens/redis/noxfile.py -s mypy-${{ env.LATEST_STABLE_PYTHON }} blacken lint
+          nox -f tests/integration/goldens/asset/noxfile.py -s format lint mypy-${{ env.LATEST_STABLE_PYTHON }}
+          nox -f tests/integration/goldens/credentials/noxfile.py -s format lint mypy-${{ env.LATEST_STABLE_PYTHON }}
+          nox -f tests/integration/goldens/eventarc/noxfile.py -s format lint mypy-${{ env.LATEST_STABLE_PYTHON }} 
+          nox -f tests/integration/goldens/logging/noxfile.py -s format lint mypy-${{ env.LATEST_STABLE_PYTHON }}
+          nox -f tests/integration/goldens/redis/noxfile.py -s format lint mypy-${{ env.LATEST_STABLE_PYTHON }}
   goldens-unit:
     runs-on: ubuntu-latest
     steps:

gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2

@@ -98,7 +98,9 @@ class {{ service.async_client_name }}:
         Returns:
             {{ service.async_client_name }}: The constructed client.
         """
-        sa_info_func = {{ service.client_name }}.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            {{ service.client_name }}.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func({{ service.async_client_name }}, info, *args, **kwargs)
 
     @classmethod
@@ -115,7 +117,9 @@ class {{ service.async_client_name }}:
         Returns:
             {{ service.async_client_name }}: The constructed client.
         """
-        sa_file_func = {{ service.client_name }}.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            {{ service.client_name }}.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func({{ service.async_client_name }}, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

gapic/templates/mypy.ini.j2

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/asset/google/cloud/asset_v1/services/asset_service/async_client.py

@@ -106,7 +106,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             AssetServiceAsyncClient: The constructed client.
         """
-        sa_info_func = AssetServiceClient.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            AssetServiceClient.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(AssetServiceAsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -123,7 +125,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             AssetServiceAsyncClient: The constructed client.
         """
-        sa_file_func = AssetServiceClient.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            AssetServiceClient.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(AssetServiceAsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/asset/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/credentials/google/iam/credentials_v1/services/iam_credentials/async_client.py

@@ -97,7 +97,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             IAMCredentialsAsyncClient: The constructed client.
         """
-        sa_info_func = IAMCredentialsClient.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            IAMCredentialsClient.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(IAMCredentialsAsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -114,7 +116,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             IAMCredentialsAsyncClient: The constructed client.
         """
-        sa_file_func = IAMCredentialsClient.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            IAMCredentialsClient.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(IAMCredentialsAsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/credentials/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/eventarc/google/cloud/eventarc_v1/services/eventarc/async_client.py

@@ -124,7 +124,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             EventarcAsyncClient: The constructed client.
         """
-        sa_info_func = EventarcClient.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            EventarcClient.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(EventarcAsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -141,7 +143,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             EventarcAsyncClient: The constructed client.
         """
-        sa_file_func = EventarcClient.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            EventarcClient.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(EventarcAsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/eventarc/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/logging/google/cloud/logging_v2/services/config_service_v2/async_client.py

@@ -104,7 +104,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             ConfigServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = ConfigServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            ConfigServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(ConfigServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -121,7 +123,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             ConfigServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = ConfigServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            ConfigServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(ConfigServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging/google/cloud/logging_v2/services/logging_service_v2/async_client.py

@@ -89,7 +89,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             LoggingServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = LoggingServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            LoggingServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(LoggingServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -106,7 +108,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             LoggingServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = LoggingServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            LoggingServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(LoggingServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging/google/cloud/logging_v2/services/metrics_service_v2/async_client.py

@@ -90,7 +90,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             MetricsServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = MetricsServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            MetricsServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(MetricsServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -107,7 +109,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             MetricsServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = MetricsServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            MetricsServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(MetricsServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/logging_internal/google/cloud/logging_v2/services/config_service_v2/async_client.py

@@ -104,7 +104,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             BaseConfigServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = BaseConfigServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            BaseConfigServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(BaseConfigServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -121,7 +123,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             BaseConfigServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = BaseConfigServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            BaseConfigServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(BaseConfigServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging_internal/google/cloud/logging_v2/services/logging_service_v2/async_client.py

@@ -89,7 +89,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             LoggingServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = LoggingServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            LoggingServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(LoggingServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -106,7 +108,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             LoggingServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = LoggingServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            LoggingServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(LoggingServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging_internal/google/cloud/logging_v2/services/metrics_service_v2/async_client.py

@@ -90,7 +90,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             BaseMetricsServiceV2AsyncClient: The constructed client.
         """
-        sa_info_func = BaseMetricsServiceV2Client.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            BaseMetricsServiceV2Client.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(BaseMetricsServiceV2AsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -107,7 +109,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             BaseMetricsServiceV2AsyncClient: The constructed client.
         """
-        sa_file_func = BaseMetricsServiceV2Client.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            BaseMetricsServiceV2Client.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(BaseMetricsServiceV2AsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/logging_internal/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/redis/google/cloud/redis_v1/services/cloud_redis/async_client.py

@@ -114,7 +114,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             CloudRedisAsyncClient: The constructed client.
         """
-        sa_info_func = CloudRedisClient.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            CloudRedisClient.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(CloudRedisAsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -131,7 +133,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             CloudRedisAsyncClient: The constructed client.
         """
-        sa_file_func = CloudRedisClient.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            CloudRedisClient.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(CloudRedisAsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file

tests/integration/goldens/redis/mypy.ini

@@ -1,3 +1,15 @@
 [mypy]
 python_version = 3.14
 namespace_packages = True
+ignore_missing_imports = False
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2563):
+# Dependencies that historically lacks py.typed markers
+[mypy-google.iam.*]
+ignore_missing_imports = True
+
+# Helps mypy navigate the 'google' namespace more reliably in 3.10+
+explicit_package_bases = True
+
+# Performance: reuse results from previous runs to speed up 'nox'
+incremental = True

tests/integration/goldens/redis_selective/google/cloud/redis_v1/services/cloud_redis/async_client.py

@@ -114,7 +114,9 @@ def from_service_account_info(cls, info: dict, *args, **kwargs):
         Returns:
             CloudRedisAsyncClient: The constructed client.
         """
-        sa_info_func = CloudRedisClient.from_service_account_info.__func__  # type: ignore
+        sa_info_func = (
+            CloudRedisClient.from_service_account_info.__func__  # type: ignore
+        )
         return sa_info_func(CloudRedisAsyncClient, info, *args, **kwargs)
 
     @classmethod
@@ -131,7 +133,9 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
         Returns:
             CloudRedisAsyncClient: The constructed client.
         """
-        sa_file_func = CloudRedisClient.from_service_account_file.__func__  # type: ignore
+        sa_file_func = (
+            CloudRedisClient.from_service_account_file.__func__  # type: ignore
+        )
         return sa_file_func(CloudRedisAsyncClient, filename, *args, **kwargs)
 
     from_service_account_json = from_service_account_file