Trying something else.

restrictedpython_code_eval.py

@@ -407,12 +407,12 @@ ALLOWED_SYS_NAMES = ['maxsize']
 class AllowListImporter:
     def __init__(self, allowed_imports: List[str]):
         self.allowed_imports = allowed_imports
-        inner_sys = importlib.__import__('sys')
+        inner_sys = copy.deepcopy(importlib.__import__('sys'))
         for key in list(dir(inner_sys)):
             if key not in ALLOWED_SYS_NAMES:
                 delattr(inner_sys, key)
         self.inner_sys = inner_sys
-        
+
     def __call__(self, name, globals=None, locals=None, fromlist=(), level=0):
         if name.startswith('.'):
             raise ImportError("Relative imports are not allowed.")