TYP: Create DeepChainMap from ChainMap.new_child in scope.py (#44769)

Author: kashifkhan

pandas/core/computation/scope.py

@@ -133,18 +133,13 @@ def __init__(
             # shallow copy here because we don't want to replace what's in
             # scope when we align terms (alignment accesses the underlying
             # numpy array of pandas objects)
-
-            # error: Incompatible types in assignment (expression has type
-            # "ChainMap[str, Any]", variable has type "DeepChainMap[str, Any]")
-            self.scope = self.scope.new_child(  # type: ignore[assignment]
-                (global_dict or frame.f_globals).copy()
-            )
+            scope_global = self.scope.new_child((global_dict or frame.f_globals).copy())
+            self.scope = DeepChainMap(scope_global)
             if not isinstance(local_dict, Scope):
-                # error: Incompatible types in assignment (expression has type
-                # "ChainMap[str, Any]", variable has type "DeepChainMap[str, Any]")
-                self.scope = self.scope.new_child(  # type: ignore[assignment]
+                scope_local = self.scope.new_child(
                     (local_dict or frame.f_locals).copy()
                 )
+                self.scope = DeepChainMap(scope_local)
         finally:
             del frame
 
@@ -257,9 +252,7 @@ def _get_vars(self, stack, scopes: list[str]) -> None:
         for scope, (frame, _, _, _, _, _) in variables:
             try:
                 d = getattr(frame, "f_" + scope)
-                # error: Incompatible types in assignment (expression has type
-                # "ChainMap[str, Any]", variable has type "DeepChainMap[str, Any]")
-                self.scope = self.scope.new_child(d)  # type: ignore[assignment]
+                self.scope = DeepChainMap(self.scope.new_child(d))
             finally:
                 # won't remove it, but DECREF it
                 # in Py3 this probably isn't necessary since frame won't be