为什么Django模板未显示任何输出? | 为什么Django模板未显示任何输出

本文介绍了为什么Django模板未显示任何输出?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

因此，在这里我使用django编写了一个简单的新闻应用程序，但是模板似乎无法正常工作，它没有显示从 views.py 传递的任何输出.我已经检查了 settings.py ， INSTALLED_APPS 设置是否有效

So, here I was writing a simple news app using django, but template does not seem to be working,it's not showing any output that has been passed from views.py.I have checked settings.py,INSTALLED_APPS settings it's working

views.py

from django.shortcuts import render,HttpResponse

import bs4
from bs4 import BeautifulSoup as soup
from urllib.request import urlopen


def get_news():
    news_link = "https://news.google.com/news/rss"
    page = urlopen(news_link)
    xml_page = page.read()
    page.close()

    soup_page = soup(xml_page,"xml")
    news_list = soup_page.findAll("item")
    return news_list



def index(request):
    news_list = get_news()
    return render(request,'main/index.html',{'news_list' : news_list})

和模板

    {% for news in news_list %}
    <h3> {{ news.title.text }} </h3>
    <h3> {{ news.pubDate.text }} </h3>
    {% endfor %}

如果我从render()字典传递了任何其他数据，它可以正常工作，但是在传递列表时，它不会在模板中显示任何数据

If I pass any other data from render() dictionary, it is working but when passing lists,it's not showing any data in template

我尝试检查列表是否为None或为空，但没有，但不为空.谢谢！

I tried checking if the list is None or empty but no,it's not empty.Thank you!

推荐答案

您得到的内容类似于(bs4.element.Tag实例的 __ str __ ):

You got something like (__str__ of bs4.element.Tag instance):

<标题> Lorem存有，悲...</标题>中< LINK> HTTPS:?//news.google.com/__i/rss/rd/articles/CBMiaGh0dHBzOi8vd3d3LmNubi5jb20vMjAyMC8wMi8wNS9wb2xpdGljcy9kb25hbGQtdHJ1bXAtbmFuY3ktcGVsb3NpLXN0YXRlLW9mLXRoZS11bmlvbi1hbmFseXNpcy9pbmRleC5odG1s0gFsaHR0cHM6Ly9hbXAuY25uLmNvbS9jbm4vMjAyMC8wMi8wNS9wb2xpdGljcy9kb25hbGQtdHJ1bXAtbmFuY3ktcGVsb3NpLXN0YXRlLW9mLXRoZS11bmlvbi1hbmFseXNpcy9pbmRleC5odG1s OC = 5℃;/link> ;,< guid isPermaLink ="false"> 52780574934659</guid> ;,< pubDate> Wed，05 Feb 2020 08:15:00 GMT</pubDate> ;,< description>< ol& amp; amp; amp; amp; amp;; GT;&安培; LT;李&安培; GT;&安培; LT; A HREF = https://news.google.com/__i/rss/rd/articles/CBMiaGh0dHBzOi8vd3d3LmNubi5jb20vMjAyMC8wMi8wNS9wb2xpdGljcy9kb25hbGQtdHJ1bXAtbmFuY3ktcGVsb3NpLXN0YXRlLW9mLXRoZS11bmlvbi1hbmFseXNpcy9pbmRleC5odG1s0gFsaHR0cHM6Ly9hbXAuY25uLmNvbS9jbm4vMjAyMC8wMi8wNS9wb2xpdGljcy9kb25hbGQtdHJ1bXAtbmFuY3ktcGVsb3NpLXN0YXRlLW9mLXRoZS11bmlvbi1hbmFseXNpcy9pbmRleC5odG1s?oc=5" 目标= _空白" &安培;gt;特朗普制造在《国情咨文》中令人眼花vis乱的改换音高</a& amp; nbsp;& nbsp;& lt; font color =#6f6f6f"" CNN</字体& lt;/li& gt;& lt; li& gt;& lt; a href ="https://news.google.com/__i/rss/rd/articles/CBMiK2h0dHBzOi8vd3d3LnlvdXR1YmUuY29tL3dhdDN1NQZlYzAzQNlQDQZlQnQAzNQDQ1LQNQDzDQ1DQ1DzDQ1DQ1DQ1D9D9D国庆国庆日报(英语:Football)& lt;/li& lt; li& gt;& lt; a href =" https://news.google.com/__i/rss/rd/articles/CBMiK2h0dHBzOi8vd3d3LnlvdXR1YmUuY29tL3dhdDN= 5"target =" _ blank& gt;南希·佩洛西(Nancy Pelosi)撕毁了特朗普的国情咨文(</a)& nbsp;& amp; nbsp;& lt; font color ="#6f6f6f"& gt; CNN& lt;/font& gt;& lt;/li& gt;& lt; li& gt;& lt; a href ="https://news.google.com?/__ I/RSS/次/篇/CBMiZWh0dHBzOi8vd3d3Lm5iY25ld3MuY29tL3RoaW5rL29waW5pb24vc3RhdGUtdW5pb24taXNuLXQtc3Ryb25nLXRydW1wLXByZXRlbmRzLWl0LXMtYmV0dGVyLW5jbmExMTI5OTIx0gEtaHR0cHM6Ly93d3cubmJjbmV3cy5jb20vdGhpbmsvYW1wL25jbmExMTI5OTIx OC = 5" 目标= _空白" &放大器; GT;的国情咨文是没有那么强，因为特朗普假装，但它比民主党人说，&放大器; LT;/A&安培;gt;& nbsp;& amp; nbsp;& lt; fontcolor =#6f6f6f"& gt; NBC新闻</font& gt;& lt;/li& gt;& lt; li& gt;& lt; a href ="https://news?.google.com/__ I/RSS/次/篇/CBMicWh0dHBzOi8vbnlwb3N0LmNvbS8yMDIwLzAyLzA1L3N0YXRlLW9mLXRoZS11bmlvbi1hZGRyZXNzLXRydW1wLWhpdHMtZ3JhbmQtc2xhbS13aGlsZS1wZWxvc2ktanVzdC1sb29rcy1sb29rcy1zYWQv0gF1aHR0cHM6Ly9ueXBvc3QuY29tLzIwMjAvMDIvMDUvc3RhdGUtb2YtdGhlLXVuaW9uLWFkZHJlc3MtdHJ1bXAtaGl0cy1ncmFuZC1zbGFtLXdoaWxlLXBlbG9zaS1qdXN0LWxvb2tzLWxvb2tzLXNhZC9hbXAv OC = 5" 目标= _空白" &放大器; GT;的国情咨文:特鲁姆普打大满贯，而佩洛西只是外表看起来悲伤和放大器; LT;/A&放大器;& nbsp;& amp; nbsp;字体颜色=#6f6f6f"& gt;纽约邮报</font& gt;& lt;/li& gt;&安培; LT;李&安培; GT;&安培; LT; A HREF =https://news.google.com/__i/rss/rd/articles/CBMiZmh0dHBzOi8vd3d3LmZveG5ld3MuY29tL29waW5pb24vbGVzbGllLW1hcnNoYWxsLXNvdHUtYWRkcmVzcy1jb250aW51ZXMtdHJ1bXBzLXJvbGUtYXMtZGl2aWRlci1pbi1jaGllZtIBamh0dHBzOi8vd3d3LmZveG5ld3MuY29tL29waW5pb24vbGVzbGllLW1hcnNoYWxsLXNvdHUtYWRkcmVzcy1jb250aW51ZXMtdHJ1bXBzLXJvbGUtYXMtZGl2aWRlci1pbi1jaGllZi5hbXA?oc = 5"target =" _ blank& amp; b& Leslie Marshall:SOTU地址Trump继续; font color =#6f6f6f"> Fox News</font& gt;</li& gt;< li& gt;< strong& lt;& lt; a href ="https://news.google.com/stories/CAAqOQgKIjNDQklTSURvSmMzUnZjbmt0TXpZd1NoTUtFUWlEamE3N2pvQU1FU1YxUEo2emxrYWRLQUFQAQ?oc=5" target ="_ blank"& gt;& gt;& gt;/strong& lt;/li& lt;/ol& gt;</description>，<源url ="https://www.cnn.com"> CNN</来源>

存储在新闻中.

您不能使用 {{news.title.text}} 访问该实例.这就是为什么您最终在模板中得到空结果的原因.尝试{{新闻}}，您将看到其中的内容.

You can't access this instance with {{ news.title.text }}. That's why you end up with a empty result in your template. Try {{ news }} an you'll see what's in there.

要么创建自定义模板过滤器，要么可以从该实例中提取必要的数据-> https://docs.djangoproject.com/en/3.0/howto/custom-template-tags/

Either you create a custom template filter, which can extract the necessary data from that instance --> https://docs.djangoproject.com/en/3.0/howto/custom-template-tags/

或者您将 get_news 方法中的数据准备到python结构 dicts列表

Or you prepare the data in your get_news method into a python structure list of dicts

工作示例:

def get_news():
    news_link = "https://news.google.com/news/rss"
    page = urlopen(news_link)
    xml_page = page.read()
    page.close()

    soup_page = soup(xml_page, "xml")
    news_list = map(
        lambda item: {'title': item.title.text, 'date': item.pubDate.text},
        soup_page.findAll("item"))
    return news_list

在模板中:

    {% for news in news_list %}
        <h3> {{ news.title }} </h3>
        <h3> {{ news.date }} </h3>
    {% endfor %}

这篇关于为什么Django模板未显示任何输出?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！