/ app / OSError为什么会发生这样一个奇怪的错误?

时间:2017-09-25 08:28:44

标签: python django jinja2

我收到了一个错误:

  

/ app /

中的OSError      

[Errno 63]文件名太长:“/ Users / xxx / testapp / templates / jinja2 / {'items':[{'---':'---','A':'a' ,'B':'b','C:'c','D':'d'}]​​}

我想在json_dict中将views.py json_parse方法的结果嵌入index.html。我在views.py写了

from django.shortcuts import render
import json

def index(request):
    f = open('./data/data.json', 'r')
    json_dict = json.load(f)
    return render('./index.html',json_dict)

我在index.html中写过

<html>
 <head>
 <script type="text/javascript" src="//code.jquery.com/jquery-1.11.0.min.js"></script>
  <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/chosen/1.8.2/chosen.jquery.min.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/chosen/1.4.2/chosen.jquery.js"></script>
 <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/chosen/1.4.2/chosen.css">
 </head>
 <body>
    <select id="mainDD" data-placeholder="Choose" class="chzn-select" style="width:600px;">
    {% for k, v in json_dict.items %}
            <option>{{ v }}</option>
    {% endfor %}
    </select>
  </body>
</html>

json_dict包含{'items': [{'---': '---' ~~~字典。我真的无法理解为什么我无法将json_dict发送给index.html。我使用render方法错了吗?我该如何解决这个问题?

app(子应用)的urls.py有views.py&amp; index.html是

from django.conf.urls import url
from . import views


urlpatterns = [
    url(r'^$', views.index, name='index'),
]

父app的urls.py是

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^app/', include('app.urls')),
]

追溯是

Traceback:

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/xxx/testapp/app/views.py" in index
  8.     return render('./index.html',json_dict)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/shortcuts.py" in render
  30.     content = loader.render_to_string(template_name, context, request, using=using)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loader.py" in render_to_string
  67.         template = get_template(template_name, using=using)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loader.py" in get_template
  21.             return engine.get_template(template_name)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/backends/django.py" in get_template
  39.             return Template(self.engine.get_template(template_name), self)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/engine.py" in get_template
  162.         template, origin = self.find_template(template_name)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/engine.py" in find_template
  136.                         name, template_dirs=dirs, skip=skip,

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loaders/base.py" in get_template
  38.                 contents = self.get_contents(origin)

File "/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loaders/filesystem.py" in get_contents
  28.             with io.open(origin.name, encoding=self.engine.file_charset) as fp:

Exception Type: OSError at /app/
Exception Value: [Errno 63] File name too long: "/Users/xxx/testapp/templates/jinja2/{'items': [{'---': '---', ‘A’: ‘a’, ‘B’: ‘b’, ‘C: ‘c’, ‘D’: ‘d’}]}

通过回答编辑后,我在/ app /收到错误TypeError init ()得到了一个意外的关键字参数'match_extension'。 Traceback说 回溯:

getitem 中的文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/utils.py”   65. return self._engines [别名]

在处理上述异常('django')期间,发生了另一个异常:

内部文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/exception.py”   41. response = get_response(request)

_get_response中的

文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/base.py”   187. response = self.process_exception_by_middleware(e,request)

_get_response中的

文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/core/handlers/base.py”   185. response = wrapped_callback(request,* callback_args,** callback_kwargs)

索引中的

文件“/Users/xxx/testapp/app/views.py”   13. return render(request,'jinja2 / index.html',{'json_dict':json_dict})

渲染文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/shortcuts.py”   30. content = loader.render_to_string(template_name,context,request,using = using)

render_to_string中的文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loader.py”   67. template = get_template(template_name,using = using)

<_> get_template中的文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loader.py”   18. engines = _engine_list(使用)

_engine_list中的

文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/loader.py”   72.如果使用的是其他[engine [using]]

,则返回engines.all()

文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/utils.py”   89.返回[self [alias] for alias in self]

文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/utils.py”in   89.返回[self [alias] for alias in self]

getitem 中的文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/utils.py”   80. engine = engine_cls(params)

init 中的文件“/Users/xxx/myenv/lib/python3.5/site-packages/django/template/backends/django.py”   32. self.engine = Engine(self.dirs,self.app_dirs,** options)

异常类型:/ app /的TypeError 异常值: init ()得到意外的关键字参数'match_extension'

1 个答案:

答案 0 :(得分:1)

您对render()的来电是错误的,请尝试:

def index(request):
    with open('./data/data.json', 'r') as f:
        json_dict = json.loads(f.read())
    return render(request, 'index.html', {'json_dict': json_dict})

一切都在文档中:

https://docs.djangoproject.com/en/1.11/topics/http/shortcuts/#render