replaced list type by Sequence to improve type hinting

src/copapy/_basic_types.py

@@ -1,5 +1,5 @@
 import pkgutil
-from typing import Any, TypeVar, overload, TypeAlias, Generic, cast
+from typing import Any, Sequence, TypeVar, overload, TypeAlias, Generic, cast
 from ._stencils import stencil_database, detect_process_arch
 import copapy as cp
 
@@ -49,7 +49,7 @@ class Node:
         name (str): The name of the operation this Node represents.
     """
     def __init__(self) -> None:
-        self.args: list[Net] = []
+        self.args: Sequence[Net] = []
         self.name: str = ''
 
     def __repr__(self) -> str:
@@ -67,6 +67,7 @@ class Net:
     def __init__(self, dtype: str, source: Node):
         self.dtype = dtype
         self.source = source
+        self.grad: NumLike = 1
 
     def __repr__(self) -> str:
         names = get_var_name(self)
@@ -104,6 +105,8 @@ class variable(Generic[TNum], Net):
             self.source = CPConstant(source)
             self.dtype = 'int'
         
+        self.grad = 1
+
     @overload
     def __add__(self: 'variable[TNum]', other: 'variable[TNum] | TNum') -> 'variable[TNum]': ...
     @overload
@@ -332,15 +335,15 @@ class Write(Node):
 
 
 class Op(Node):
-    def __init__(self, typed_op_name: str, args: list[Net]):
+    def __init__(self, typed_op_name: str, args: Sequence[Net]):
         assert not args or any(isinstance(t, Net) for t in args), 'args parameter must be of type list[Net]'
         self.name: str = typed_op_name
-        self.args: list[Net] = args
+        self.args: Sequence[Net] = args
 
 
-def net_from_value(value: Any) -> Net:
+def net_from_value(value: Any) -> variable[Any]:
     vi = CPConstant(value)
-    return Net(vi.dtype, vi)
+    return variable(vi, vi.dtype)
 
 
 @overload