    def visit_Name(self, node):
        id_ = node.id.lower()
        if id_ in self._env:
            return self._env[id_]
        else:
            raise NameError(node.id)
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.