django - 无情的模板语法错误

Question

更新#7：

我删除了第一行并将第二行放在它的位置，第二行是我从 jinja2 链接jinja2 install docs复制的。但我仍然收到以下错误。

# from google.appengine.ext.webapp import template
from jinja2 import Template

  File "/Users/brian/googleapps/YouPoll/views.py", line 271, in get
    self.response.out.write(template.render(path, template_values))
NameError: global name 'template' is not defined
INFO     2012-07-08 22:43:53,053 dev_appserver.py:2952] "GET /?ID=testBSchott HTTP/1.1" 500 

这个 appengine 不久前使用模板文件中的非 django 代码工作。

此外，如果我在 gae 交互式控制台中执行以下代码，它可以工作，即使它包含我认为是 jinja2 而不是 django 独有的 {%- if ... -%} 代码。

from jinja2 import Template
template = Template('{%- if True -%}Hello {{ name }}!{% endif %}')
print template.render(name='John Doe')

更新#6：

好的，我发现变量模板被定义了。它在下面。

jinja_environment.filters['datetimeformat'] = datetimeformat

class BaseHandler(webapp2.RequestHandler):

    @webapp2.cached_property
    def jinja2(self):
        return jinja2.get_jinja2(app=self.app)

    def render_template(
        self,
        filename,
        template_values,
        **template_args
        ):
        template = jinja_environment.get_template(filename)
        self.response.out.write(template.render(template_values))

更新#5：

这是我在views.py中的导入：

import jinja2
import os
import webapp2
import logging
import datetime
from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.api import images
# from jinja2 import Environment, PackageLoader

from models import QA, PQ

TEMPLATE_DIR = os.path.join(os.path.dirname(__file__), 'templates')
jinja_environment = \
    jinja2.Environment(loader=jinja2.FileSystemLoader(TEMPLATE_DIR))

在我发布的一些代码中，我对 template_values 的使用如下。2 个导入提到 webapp，而不是 webapp2。但是，如果我将第一个更改为 webapp2，我会收到此错误。

  File "/Users/brian/googleapps/YouPoll/views.py", line 9, in <module>
    from google.appengine.ext.webapp2 import template
ImportError: No module named webapp2
INFO     2012-07-08 18:44:18,972 dev_appserver.py:2952] "GET /?ID=testBSchott HTTP/1.1" 500 

如果我删除该行，我会收到此错误。

  File "/Users/brian/googleapps/YouPoll/views.py", line 272, in get
    self.response.out.write(template.render(path, template_values))
NameError: global name 'template' is not defined
INFO     2012-07-08 18:30:52,733 dev_appserver.py:2952] "GET /?ID=testBSchott HTTP/1.1" 500

你看到我能做些什么了吗？我提供了你需要的信息吗？

更新#3：如果我删除这 5 个 jinja2 序列/短语，则 html 表单可以正常工作。但是这 5 个序列/短语没有语法错误。他们过去工作得很好。我在第一次更新中添加了包含 django 的 Traceback，尽管我没有使用 django——只有 jinja。那么我还犯了什么错误？

在删除上面的序列/短语之前，我还在底部包含了我的 html 页面。

1

{% for choice in p.choices -%}
{% if not loop.first %}
,{% endif %}
 {% if loop.last %}
    or 
 {% endif %}
 {{ choice }} 
{%- endfor %}.

2 {% for selection in p.choices %} {% if not loop.first %} ,{% endif %} {% if loop.last %} 或 {% endif %} {{ choice }} {% endfor %} .

3

{{ q.answers|sum() }}

4

q.date|datetimeformat('%d-%m-%Y')

5

q.modified|datetimeformat('%d-%m-%Y')

更新结束#3

这句话出现在错误之前，工作正常。

   {% if p.purpose %}
   </p>
  <p> The purpose of this questionnaire is {{ p.purpose }}.
  </p>
   {% endif %} 

但是接下来的这个短语会引发错误（显然）。

{% for choice in p.choices -%}
{% if not loop.first %}
,{% endif %}
 {% if loop.last %}
    or 
 {% endif %}
 {{ choice }} 
{%- endfor %}. 

接下来是错误。

更新＃2：如果我修改“错误”“for”语句，删除空间控制“-”，系统仍会转到下面的下一个错误，但“-”并不是真正的错误。

ERROR    2012-07-06 21:46:07,107 webapp2.py:1553] 'for' statements should use the format 'for x in y': for choice in p.choices -
Traceback (most recent call last):

更新#1：

  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1536, in __call__
    rv = self.handle_exception(request, response, e)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1530, in __call__
    rv = self.router.dispatch(request, response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/Users/brian/googleapps/YouPoll/views.py", line 272, in get
    self.response.out.write(template.render(path, template_values))
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/template.py", line 89, in render
    t = _load_internal_django(template_path, debug)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/template.py", line 163, in _load_internal_django
    template = django.template.loader.get_template(file_name)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/loader.py", line 160, in get_template
    template = get_template_from_string(template, origin, template_name)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/loader.py", line 168, in get_template_from_string
    return Template(source, origin, name)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 158, in __init__
    self.nodelist = compile_string(template_string, origin)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 186, in compile_string
    return parser.parse()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 281, in parse
    compiled_result = compile_func(self, token)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/loader_tags.py", line 195, in do_extends
    nodelist = parser.parse()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 281, in parse
    compiled_result = compile_func(self, token)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/loader_tags.py", line 173, in do_block
    nodelist = parser.parse(('endblock', 'endblock %s' % block_name))
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 281, in parse
    compiled_result = compile_func(self, token)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/defaulttags.py", line 684, in do_for
    " 'for x in y': %s" % token.contents)

TemplateSyntaxError: 'for' statements should use the format 'for x in y': for choice in p.choices -
INFO     2012-07-06 21:46:07,117 dev_appserver.py:2952] "GET /?ID=testBSchott HTTP/1.1" 500 -

如果我从模板中删除该短语，则此短语会引发错误（在跳过其他一些（%ifs 和 {%fors ）之后）。

{% for q in qs|sort(attribute='seqnum') %}

接下来是错误。

ERROR    2012-07-06 21:48:38,177 webapp2.py:1553] Invalid filter: 'sort'
Traceback (most recent call last):
...
TemplateSyntaxError: Invalid filter: 'sort'
INFO     2012-07-06 21:44:03,051 dev_appserver.py:2952] "GET /?ID=testBSchott HTTP/1.1" 500 -

如果我从模板中删除该短语，则此短语会引发错误（在跳过其他一些（%ifs 和 {%fors ）之后）。

<td align="right"> {{ q.answers|sum() }} </td>

如果我从模板中删除该短语，那么这个短语也会引发错误。

ERROR    2012-07-06 21:36:07,650 webapp2.py:1553] Invalid filter: 'sum'
Traceback (most recent call last):
...
TemplateSyntaxError: Invalid filter: 'sum'

等等。这看起来像是其他问题的信号。但我没有头绪。这个模板之前工作了一点，但已经停止工作，所以我怀疑我的 python 代码中有一些错误是原因，但我无法想象从哪里开始寻找。

顺便说一句，当我使用 jinja2 时，Traceback 经常提到 Django，但我认为这无关紧要。

下面是我用来提供模板的 python 代码。我留下了日志信息以显示我所做的一些调试。

qs = db.Query(QA)
qs.ancestor(person)
qs.filter('deleteRequested =', False)
qs.run()
for item in qs:
    logging.info("2 seqnum %d" % item.seqnum)
for item in person.choices:
    logging.info("2 choice %s" % item )
logging.info("2 title %s" % person.title  )
logging.info("2 person.key()%s" % person.key())

# template_values = {'ID_id':person.key(), 
template_values = { 'p': person,
    'qs': qs
    }
path = os.path.join(TEMPLATE_DIR, 'table.html')
logging.info("Here After Revise" )
self.response.out.write(template.render(path, template_values))

更新#4：

以下是我失败的 html 页面的列表。

{% extends "base.html" %}
{% block content %}
<center>
    <h1>Make your preferences for <span class="emph">{{p.ID|escape}}</span> known here</h1>
   {% if p.title %}
  </center>
  <p><h2> The title of this questionnaire is: {{ p.title }}.</h2> </p>
  </center>
   {% endif %} 
  <br />

   <div id="inputdata">
   {% if p.purpose %}
  <p> The purpose of this questionnaire is: {{ p.purpose }}.
  </p>
   {% endif %} 
  <p>This is a participative preferences survey: you not only answer questions, you supply questions for all to answer.
  </p>
  <ol>
<li>
  To answer existing questions, click on the "Radio" button in the corresponding rows of the table: 
{% for choice in p.choices -%}
{% if not loop.first %}
,{% endif %}
 {% if loop.last %}
   &nbsp;or&nbsp;
 {% endif %}
 {{ choice }} 
{%- endfor %}.  
</li>
<li>
  After answering questions, at the bottom of the page click the "Submit" button to register you answers.
</li>
</ol>
  </div>
<br />
   <div id="inputdata">
  <p>To supply a new question or statement, click <a href="/add_question?ID={{ p.ID }}"><span class="emph">here</span></a>. At the present time there is no automated mechanism for editing or erasing an existing question.
  </p>
<br />
  <p>The question numbers (No's) are used to arrange the questions.  You place your question in the list with the number you choose.
  </p>
  </div>
   {% if not p.moreinfo == 'None' %}
   <p> {{ p.moreinfo }} 
   </p>
   {% endif %} 
<form action="table" method="post" enctype="multipart/form-data">
       <input type="hidden" name="ID" value="{{p.ID|escape}}"></input><br/>
  <table border="1" cellpadding="2" 
      cellspacing="0" class="sortable" id="unique-id">
 <thead> <tr> 
<td>No</td>
<td>Question</td>
<td> Total </td>
{% for choice in p.choices %}
<td bgcolor="#fef886"> {{ choice }} </td>
{% endfor %}
<td> Created </td>
<td> Last answered </td>
</tr></thead>

<tbody>
    {% if qs %}
{% for q in qs|sort(attribute='seqnum') %}
    <tr>
    <td align="right"> {{ q.seqnum }} </td>
    <td> {{ q.question }} </td>
    <td align="right"> {{ q.answers|sum() }} </td>
    {# <td> {{ q.total }} </td> #}
        {% for answer in q.answers %}
    <td bgcolor="#fef886"> 
        <input type="radio" name="{{q.seqnum}}" value="{{loop.index}}"
        />
        {{ answer }} 
    </td>
        {% endfor %}
<td>{{ q.date|datetimeformat('%d-%m-%Y') }}</td>
<td>{{ q.modified|datetimeformat('%d-%m-%Y')}}</td>
</tr>
{% endfor %}
{% endif %}
</tbody>
</table>
  <br />
   <div id="inputdata">
       <p>To remember your own choices, print this page before ReLoading</p>
  </div>
<center>
  <input type="submit" 
   name="Submit" 
   value="Submit" /> 
  </center>
  </form>   

<script src="/static/javascript/sorttable.js" type="text/javascript"></script>

{% endblock content %}

Answer 1

Wooble 通过评论摆脱google.appengine.ext.webapp import template并替换为 确实回答了这个问题from jinja2 import Template，但我也遇到了另一个错误，这可能导致了原始问题。我曾经使用过self.response.out.write(template.render(path, template_values))而不是self.render_template('table.html', template_values )在某一时刻。

关键问题是，当我认为我正在使用 jinja2 时，gae 正在使用 django，而 Wooble 强调了我在最初的问题中只是随便提到的那个事实。

（所以我希望 Wooble 得到这个答案的信任。）