checker.py 文件源码

def handleNodeDelete(self, node):

        def on_conditional_branch():
            """
            Return `True` if node is part of a conditional body.
            """
            current = getattr(node, 'parent', None)
            while current:
                if isinstance(current, (ast.If, ast.While, ast.IfExp)):
                    return True
                current = getattr(current, 'parent', None)
            return False

        name = getNodeName(node)
        if not name:
            return

        if on_conditional_branch():
            # We cannot predict if this conditional branch is going to
            # be executed.
            return

        if isinstance(self.scope, FunctionScope) and name in self.scope.globals:
            self.scope.globals.remove(name)
        else:
            try:
                del self.scope[name]
            except KeyError:
                self.report(messages.UndefinedName, node, name)