如何在antlr的python访问器中迭代

from antlr4 import *
from YourGrammarLexer import YourGrammarLexer
from YourGrammarParser import YourGrammarParser
from YourGrammarVisitor import YourGrammarVisitor

class MyVisitor(YourGrammarVisitor):
    def visitYourRule(self, ctx: YourGrammarParser.YourRuleContext):
        # 迭代子节点
        for child in ctx.children:
            # 处理子节点
            self.visit(child)

if __name__ == '__main__':
    # 创建输入流
    input_stream = InputStream("your input")

    # 创建词法分析器
    lexer = YourGrammarLexer(input_stream)

    # 创建词法记号流
    token_stream = CommonTokenStream(lexer)

    # 创建语法分析器
    parser = YourGrammarParser(token_stream)

    # 解析语法规则
    tree = parser.yourRule()

    # 创建自定义访问器
    visitor = MyVisitor()

    # 遍历语法树
    visitor.visit(tree)