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我正在将我的烧瓶应用程序中的字符串列表传递给 html 模板，在我尝试附加列表之前，它工作得非常好。我已经使用客户端 python 脚本测试了我对 append 方法的使用，它正在工作。我很困惑为什么我的列表附加会导致内部服务器错误。这是我的模板中使用参数的部分

<ul>
    {% for file in files %}
    <li>{{ file }}</li>
    {% endfor %}
</ul>

这是我的烧瓶应用程序中的路线

@app.route('/')
def main():
    FILES = [ 'test1', 'test2' ]

    # Iterate through each file in the cloud storage container
    for container in conn.get_account()[1]:
        for data in conn.get_container(container['name'])[1]:
            print 'object: {0}t size: {1}t date: {2}'.format(data['name'], data['bytes'], data['last_modified'])
            FILES.append('test3')
    return render_template('index.html', files = FILES)

FILES.append('test3') 行导致了问题，但我不知道为什么。当我注释掉这一行时，列表会按照您的预期传递给模板。

这是完整的追溯

Traceback (most recent call last):
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/vcap/app/server.py", line 93, in main
    for container in conn.get_account()[1]:
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 1615, in get_account
    full_listing=full_listing)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 1553, in _retry
    self.url, self.token = self.get_auth()
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 1507, in get_auth
    timeout=self.timeout)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 617, in get_auth
    auth_version=auth_version)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 517, in get_auth_keystone
    ksclient, exceptions = _import_keystone_client(auth_version)
  File "/home/vcap/app/.heroku/python/lib/python2.7/site-packages/swiftclient/client.py", line 502, in _import_keystone_client
    variables to be set or overridden with -A, -U, or -K.''')
ClientException: 
Auth versions 2.0 and 3 require python-keystoneclient, install it or use Auth
version 1.0 which requires ST_AUTH, ST_USER, and ST_KEY environment
variables to be set or overridden with -A, -U, or -K.

似乎附加并没有导致错误，而是暴露了一个错误。整理好后我会更新。

4

1 回答 1

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如回溯底部所示，我在应用程序需求和导入语句中都缺少 python-keystoneclient。

我通过添加解决了这个问题

python-keystoneclient

到我的 requirements.txt（这是 python-heroku-buildpack 的要求文件），然后允许我将导入添加到我的 Flask 应用程序

import keystoneclient.v3 as keystoneclient
于 2016-04-09T19:08:30.317 回答