Fix linting errors

src/cattr/converters.py

@@ -298,7 +298,11 @@ def _structure_default(self, obj, cl):
             return obj
 
         if is_generic(cl):
-            fn = make_dict_structure_fn(cl, self, _cattrs_prefer_attrib_converters=self._prefer_attrib_converters)
+            fn = make_dict_structure_fn(
+                cl,
+                self,
+                _cattrs_prefer_attrib_converters=self._prefer_attrib_converters,
+            )
             self.register_structure_hook(cl, fn)
             return fn(obj)
 

src/cattr/gen.py

@@ -3,14 +3,17 @@
 import re
 import uuid
 from dataclasses import is_dataclass
-from typing import Any, Optional, Type, TypeVar
+from typing import Any, Optional, TYPE_CHECKING, Type, TypeVar
 
 import attr
 from attr import NOTHING, resolve_types
 
 from ._compat import adapted_fields, get_args, get_origin, is_bare, is_generic
 from .errors import StructureHandlerNotFoundError
 
+if TYPE_CHECKING:
+    from cattr.converters import Converter
+
 
 @attr.s(slots=True, frozen=True)
 class AttributeOverride(object):
@@ -132,7 +135,7 @@ def generate_mapping(cl: Type, old_mapping):
 
 def make_dict_structure_fn(
     cl: Type,
-    converter,
+    converter: "Converter",
     _cattrs_forbid_extra_keys: bool = False,
     _cattrs_use_linecache: bool = True,
     _cattrs_prefer_attrib_converters: bool = False,
@@ -212,19 +215,15 @@ def make_dict_structure_fn(
                     f"    '{ian}': {struct_handler_name}(o['{kn}'], type_{an}),"
                 )
             else:
-                lines.append(
-                    f"    '{ian}': o['{kn}'],"
-                )
+                lines.append(f"    '{ian}': o['{kn}'],")
         else:
             post_lines.append(f"  if '{kn}' in o:")
             if handler:
                 post_lines.append(
                     f"    res['{ian}'] = {struct_handler_name}(o['{kn}'], type_{an})"
                 )
             else:
-                post_lines.append(
-                    f"    res['{ian}'] = o['{kn}']"
-                )
+                post_lines.append(f"    res['{ian}'] = o['{kn}']")
 
     lines.append("    }")
     if _cattrs_forbid_extra_keys:

tests/test_generics.py

@@ -87,6 +87,7 @@ def test_raises_if_no_generic_params_supplied(converter):
 
     assert exc.value.type_ is T
 
+
 def test_unstructure_generic_attrs():
     c = GenConverter()
 

tests/test_structure.py

@@ -315,6 +315,7 @@ class Bar(object):
 
     assert exc.value.type_ is Bar
 
+
 @given(data(), enums_of_primitives())
 def test_structuring_enums(data, enum):
     """Test structuring enums by their values."""
@@ -331,7 +332,7 @@ def test_structuring_unsupported():
         converter.structure(1, Converter)
 
     assert exc.value.type_ is Converter
-    
+
     with raises(StructureHandlerNotFoundError) as exc:
         converter.structure(1, Union[int, str])