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python - jinja2.exceptions.UndefinedError - 没有属性 'favicon.ico'

转载 作者：行者123 更新时间：2023-11-28 18:19:31 27 4
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我正在尝试运行我的 flask 应用程序 - 昨晚运行良好。但是，今天早上，尝试运行相同的代码(但是在另一台计算机上)时，出现错误:

jinja2.exceptions.UndefinedError: 'flask.sessions.SecureCookieSession object' has no attribute 'favicon.ico'

完整回溯:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users//Desktop/survey-system/scripts/routes.py", line 88, in course_survey
    return render_template("survey.html", course=course)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/templating.py", line 134, in render_template
    context, ctx.app)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/templating.py", line 116, in _render
    rv = template.render(context)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/Users//Desktop/survey-system/templates/survey.html", line 10, in top-level template code
    {% for q, a in zip(session[course]["questions"], session[course]["answers"]) %}
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 411, in getitem
    return obj[argument]
jinja2.exceptions.UndefinedError: 'flask.sessions.SecureCookieSession object' has no attribute 'favicon.ico'

survey.html

   <body>
      <h1 align="left"> This is the survey for {{course}}</h1>
      <form>
      {% for q, a in zip(session[course]["questions"], session[course]["answers"]) %}
      ... do stuff ...

routes.py(相关代码)

@app.template_global(name='zip')
def _zip(*args, **kwargs): # So that jinja may use the zip function
    return zip(*args, **kwargs)

@app.route('/<string:course>', methods=['GET', 'POST'])
def course_survey(course):
    return render_template("survey.html", course=course)

@app.route('/questionbank', methods=['GET', 'POST'])
def q_bank():
    if request.method == "POST":
        ...
        ...
        elif "final-survey" in request.form:
            ...
            new_survey = Survey(x, y, z) # Where Survey is a custom class created
            return redirect(url_for("course_survey", course=new_survey))

在我的代码中，我没有尝试通过 Flask 或直接通过 HTML 创建自己的图标。

脚本也永远不会中断 - 网页加载正常并且运行正常，但我在每条路线上都得到了这个回溯。

最佳答案

可能是 flask 自动尝试获取一个图标

127.0.0.1 - - [07/Sep/2017 10:42:48] "GET /favicon.ico HTTP/1.1" 200 -

即使你没有网站图标你的

@app.route("/<string:course>")

捕获它并尝试获取 session ["favicon.ico"] 但失败了

错误可能消失了，因为你的浏览器缓存了 favicon.ico，所以它只加载(请求)一次

关于python - jinja2.exceptions.UndefinedError - 没有属性 'favicon.ico'，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46065030/

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