[SymForce-External] Convert skymarshal templates from py2 to py3 style annotations

Convert skymarshal templates from py2 to py3 style annotations

Update skymarshal Python code generation templates to use Python 3-style
inline type annotations instead of Python 2-style comment annotations.

Changes:
- Update python_enum.py.template: convert all method signatures from
  `# type: (args) -> return` comments to inline `(args: T) -> R` syntax
- Update python_struct.py.template: remove quotes from forward-reference
  return types (e.g., `-> "Name"` becomes `-> Name`)
- Add `from __future__ import annotations` to wrapper templates
  (python_enum_default_wrapper.py.template and
  python_struct_default_wrapper.py.template) to enable PEP 563
  postponed annotation evaluation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Topic: skymarshal-py3-annotations
Closes symforce-org/symforce#451
GitOrigin-RevId: 59feda7d816d6ad99c1de193a7716a1065038fff

Author: aaron-skydio

test/symforce_function_codegen_test_data/symengine/codegen_cpp_test_data/python/lcmtypes/codegen_cpp_test/_constants_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -25,7 +27,7 @@ def __init__(
     @staticmethod
     def from_all_fields(
         epsilon: float,
-    ) -> "constants_t":
+    ) -> constants_t:
         return constants_t(
             epsilon=epsilon,
         )
@@ -39,7 +41,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "constants_t":
+    def _default(cls) -> constants_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -65,7 +67,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
         buf.write(constants_t._CACHED_STRUCT_0.pack(self.epsilon))
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "constants_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> constants_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -81,7 +83,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "constants_t":
         return constants_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "constants_t":
+    def _decode_one(buf: T.BinaryIO) -> constants_t:
         self = constants_t(_skip_initialize=True)
         self.epsilon = constants_t._CACHED_STRUCT_0.unpack(buf.read(8))[0]
         return self
@@ -101,7 +103,7 @@ def _get_packed_fingerprint() -> bytes:
             constants_t._packed_fingerprint = struct.pack(">Q", constants_t._get_hash_recursive([]))
         return constants_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "constants_t":
+    def deepcopy(self, **kwargs: T.Any) -> constants_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_cpp_test_data/python/lcmtypes/codegen_cpp_test/_states_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -26,7 +28,7 @@ def __init__(
     @staticmethod
     def from_all_fields(
         p: Vector2d,
-    ) -> "states_t":
+    ) -> states_t:
         return states_t(
             p=p,
         )
@@ -40,7 +42,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "states_t":
+    def _default(cls) -> states_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -70,7 +72,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
         self.p._encode_one(buf)
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "states_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> states_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -86,7 +88,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "states_t":
         return states_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "states_t":
+    def _decode_one(buf: T.BinaryIO) -> states_t:
         self = states_t(_skip_initialize=True)
         self.p = Vector2d._decode_one(buf)
         return self
@@ -107,7 +109,7 @@ def _get_packed_fingerprint() -> bytes:
             states_t._packed_fingerprint = struct.pack(">Q", states_t._get_hash_recursive([]))
         return states_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "states_t":
+    def deepcopy(self, **kwargs: T.Any) -> states_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_cpp_test_data/python/lcmtypes/codegen_cpp_test/_values_vec_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -41,7 +43,7 @@ def from_all_fields(
         rot_vec: T.List[Vector4d],
         scalar_vec: T.List[float],
         list_of_lists: T.List[T.List[Vector4d]],
-    ) -> "values_vec_t":
+    ) -> values_vec_t:
         return values_vec_t(
             x=x,
             y=y,
@@ -60,7 +62,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "values_vec_t":
+    def _default(cls) -> values_vec_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -110,7 +112,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
                 self.list_of_lists[i0][i1]._encode_one(buf)
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "values_vec_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> values_vec_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -126,7 +128,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "values_vec_t":
         return values_vec_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "values_vec_t":
+    def _decode_one(buf: T.BinaryIO) -> values_vec_t:
         self = values_vec_t(_skip_initialize=True)
         self.x, self.y = values_vec_t._CACHED_STRUCT_0.unpack(buf.read(16))
         self.rot = Vector4d._decode_one(buf)
@@ -157,7 +159,7 @@ def _get_packed_fingerprint() -> bytes:
             values_vec_t._packed_fingerprint = struct.pack(">Q", values_vec_t._get_hash_recursive([]))
         return values_vec_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "values_vec_t":
+    def deepcopy(self, **kwargs: T.Any) -> values_vec_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_dataclass_in_values_test_data/python/lcmtypes/codegen_test/_my_dataclass_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -26,7 +28,7 @@ def __init__(
     @staticmethod
     def from_all_fields(
         rot: Vector4d,
-    ) -> "my_dataclass_t":
+    ) -> my_dataclass_t:
         return my_dataclass_t(
             rot=rot,
         )
@@ -40,7 +42,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "my_dataclass_t":
+    def _default(cls) -> my_dataclass_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -70,7 +72,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
         self.rot._encode_one(buf)
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "my_dataclass_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> my_dataclass_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -86,7 +88,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "my_dataclass_t":
         return my_dataclass_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "my_dataclass_t":
+    def _decode_one(buf: T.BinaryIO) -> my_dataclass_t:
         self = my_dataclass_t(_skip_initialize=True)
         self.rot = Vector4d._decode_one(buf)
         return self
@@ -107,7 +109,7 @@ def _get_packed_fingerprint() -> bytes:
             my_dataclass_t._packed_fingerprint = struct.pack(">Q", my_dataclass_t._get_hash_recursive([]))
         return my_dataclass_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "my_dataclass_t":
+    def deepcopy(self, **kwargs: T.Any) -> my_dataclass_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_explicit_template_instantiation_test_data/python/lcmtypes/codegen_explicit_template_instantiation_test/_constants_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -25,7 +27,7 @@ def __init__(
     @staticmethod
     def from_all_fields(
         epsilon: float,
-    ) -> "constants_t":
+    ) -> constants_t:
         return constants_t(
             epsilon=epsilon,
         )
@@ -39,7 +41,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "constants_t":
+    def _default(cls) -> constants_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -65,7 +67,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
         buf.write(constants_t._CACHED_STRUCT_0.pack(self.epsilon))
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "constants_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> constants_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -81,7 +83,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "constants_t":
         return constants_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "constants_t":
+    def _decode_one(buf: T.BinaryIO) -> constants_t:
         self = constants_t(_skip_initialize=True)
         self.epsilon = constants_t._CACHED_STRUCT_0.unpack(buf.read(8))[0]
         return self
@@ -101,7 +103,7 @@ def _get_packed_fingerprint() -> bytes:
             constants_t._packed_fingerprint = struct.pack(">Q", constants_t._get_hash_recursive([]))
         return constants_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "constants_t":
+    def deepcopy(self, **kwargs: T.Any) -> constants_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_explicit_template_instantiation_test_data/python/lcmtypes/codegen_explicit_template_instantiation_test/_states_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -26,7 +28,7 @@ def __init__(
     @staticmethod
     def from_all_fields(
         p: Vector2d,
-    ) -> "states_t":
+    ) -> states_t:
         return states_t(
             p=p,
         )
@@ -40,7 +42,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "states_t":
+    def _default(cls) -> states_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -70,7 +72,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
         self.p._encode_one(buf)
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "states_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> states_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -86,7 +88,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "states_t":
         return states_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "states_t":
+    def _decode_one(buf: T.BinaryIO) -> states_t:
         self = states_t(_skip_initialize=True)
         self.p = Vector2d._decode_one(buf)
         return self
@@ -107,7 +109,7 @@ def _get_packed_fingerprint() -> bytes:
             states_t._packed_fingerprint = struct.pack(">Q", states_t._get_hash_recursive([]))
         return states_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "states_t":
+    def deepcopy(self, **kwargs: T.Any) -> states_t:
         """
         Deep copy of this LCM type
 

test/symforce_function_codegen_test_data/symengine/codegen_explicit_template_instantiation_test_data/python/lcmtypes/codegen_explicit_template_instantiation_test/_values_vec_t.py

@@ -3,6 +3,8 @@
 # fmt: off
 # isort: off
 
+from __future__ import annotations
+
 import copy
 import typing as T
 
@@ -41,7 +43,7 @@ def from_all_fields(
         rot_vec: T.List[Vector4d],
         scalar_vec: T.List[float],
         list_of_lists: T.List[T.List[Vector4d]],
-    ) -> "values_vec_t":
+    ) -> values_vec_t:
         return values_vec_t(
             x=x,
             y=y,
@@ -60,7 +62,7 @@ def _skytype_meta() -> T.Dict[str, str]:
         )
 
     @classmethod
-    def _default(cls) -> "values_vec_t":
+    def _default(cls) -> values_vec_t:
         return cls()
 
     def __repr__(self) -> str:
@@ -110,7 +112,7 @@ def _encode_one(self, buf: T.BinaryIO) -> None:
                 self.list_of_lists[i0][i1]._encode_one(buf)
 
     @staticmethod
-    def decode(data: T.Union[bytes, T.BinaryIO]) -> "values_vec_t":
+    def decode(data: T.Union[bytes, T.BinaryIO]) -> values_vec_t:
         # NOTE(eric): This function can technically accept either a BinaryIO or
         # anything that supports the C++ Buffer Protocol,
         # which is unspecifiable in type hints.
@@ -126,7 +128,7 @@ def decode(data: T.Union[bytes, T.BinaryIO]) -> "values_vec_t":
         return values_vec_t._decode_one(buf)
 
     @staticmethod
-    def _decode_one(buf: T.BinaryIO) -> "values_vec_t":
+    def _decode_one(buf: T.BinaryIO) -> values_vec_t:
         self = values_vec_t(_skip_initialize=True)
         self.x, self.y = values_vec_t._CACHED_STRUCT_0.unpack(buf.read(16))
         self.rot = Vector4d._decode_one(buf)
@@ -157,7 +159,7 @@ def _get_packed_fingerprint() -> bytes:
             values_vec_t._packed_fingerprint = struct.pack(">Q", values_vec_t._get_hash_recursive([]))
         return values_vec_t._packed_fingerprint
 
-    def deepcopy(self, **kwargs: T.Any) -> "values_vec_t":
+    def deepcopy(self, **kwargs: T.Any) -> values_vec_t:
         """
         Deep copy of this LCM type