报错如下： Traceback (most recent call last): File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 2091, in __call__ return self.wsgi_app(environ, start_response) File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 2076, in wsgi_app response = self.handle_exception(e) File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 2073, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 1518, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 1516, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib64/python3.6/site-packages/flask/app.py", line 1502, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args) File "/temp/py/app-07240001.py", line 16, in display_yaml return render_template('index.html', highlighted_data=highlighted_data, css=css) File "/usr/local/lib64/python3.6/site-packages/flask/templating.py", line 150, in render_template ctx.app, File "/usr/local/lib64/python3.6/site-packages/flask/templating.py", line 128, in _render rv = template.render(context) File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 1291, in render self.environment.handle_exception() File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 925, in handle_exception raise rewrite_traceback_stack(source=source) File "/temp/py/templates/index.html", line 16, in top-level template code var originalData = {{ data|tojson|safe }}; File "/usr/local/lib/python3.6/site-packages/jinja2/filters.py", line 1673, in do_tojson return htmlsafe_json_dumps(value, dumps=dumps, **kwargs) File "/usr/local/lib/python3.6/site-packages/jinja2/utils.py", line 736, in htmlsafe_json_dumps dumps(obj, **kwargs) File "/usr/local/lib64/python3.6/site-packages/flask/json/__init__.py", line 139, in dumps rv = _json.dumps(obj, **kwargs) File "/usr/lib64/python3.6/json/__init__.py", line 238, in dumps **kw).encode(obj) File "/usr/lib64/python3.6/json/encoder.py", line 199, in encode chunks = self.iterencode(o, _one_shot=True) File "/usr/lib64/python3.6/json/encoder.py", line 257, in iterencode return _iterencode(o, 0) File "/usr/local/lib64/python3.6/site-packages/flask/json/__init__.py", line 57, in default return super().default(o) File "/usr/lib64/python3.6/json/encoder.py", line 180, in default o.__class__.__name__) TypeError: Object of type 'Undefined' is not JSON serializable

这个错误通常是由于模板中使用了未定义的变量引起的。在这种情况下，错误发生在`{{ data|tojson|safe }}`这一行，说明`data`变量没有正确传递给模板。

请确保在调用`render_template`函数时，将`data`变量作为参数传递给模板。你可以尝试将`data`变量传递给模板的方式更改为以下代码：

@app.route('/')
def display_yaml():
    with open('your_file.yml', 'r') as file:
        data = file.read()
    highlighted_data = highlight(data, YamlLexer(), HtmlFormatter())
    css = HtmlFormatter().get_style_defs('.highlight')
    return render_template('index.html', data=data, highlighted_data=highlighted_data, css=css)

然后，在`index.html`模板文件中，你需要将`data`变量传递给JavaScript部分，可以将以下代码添加到JavaScript部分：

<script>
    var originalData = {{ data|tojson|safe }};
    // ...
</script>

这样，`originalData`变量就能正确地接收来自Python代码的数据。

请确保保存并重新运行你的应用，并刷新浏览器查看结果。如果问题仍然存在，请提供完整的错误堆栈信息以供参考。