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7 Django分页器文章分页

1.复习

2。这节课要解决的问题？

3。分页的原理

4.准备工作

　　（1）创建Django项目

C:UsersAdministratorDesktop
oot3>django-admin startproject tenmins

　　（2）修改python3

#!/usr/bin/env python3

　　（3）.创建app

C:UsersAdministratorDesktop
oot3	enmins>python manage.py startapp website

　　（4）添加静态文件，

C:UsersAdministratorDesktop
oot3	enminswebsite>mkdir templates

C:UsersAdministratorDesktop
oot3	enminswebsite>mkdir static

      'DIRS': [os.path.join(BASE_DIR, 'templates').replace('\','/')],

Model层：

（1）Video表字段

from django.db import models

class Video(models.Model):
    """Video表字段"""
    title = models.CharField(null=True, blank=True, max_length=300)  # 文章标题
    content = models.TextField(null=True)  # 视频解说内容
    url_image = models.URLField(null=True, blank=True)  # 封面 网上的图片
    editors_choice = models.BooleanField(default=False)  # 文章分类用的

    def __str__(self):
        return self.title

　　（2）向后台注册，更新数据库，创建admin

View层

　　（1）view视图

from django.shortcuts import render
from  website.models import  Video
# Create your views here.


def listing(request):
    context = {}
    video_list = Video.objects.all()
    context['video_list'] = video_list
    listing_page = render(request, 'listing.html', context)
    return listing_page

　　（2） url地址

from django.conf.urls import url
from django.contrib import admin
from website.views import listing

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^list/$', listing, name='list'),
]

Template层：

　　（3）模板语言替换video.title

<!DOCTYPE html>
{% load staticfiles %}
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="../static/css/semantic.css" media="screen" title="no title" charset="utf-8">
    <link rel="stylesheet" href="../static/css/list_custom.css" media="screen" title="no title" charset="utf-8">
    <link href="https://fonts.googleapis.com/css?family=Oswald|Raleway" rel="stylesheet">

</head>

<body>
    <div class="ui inverted top fixed menu borderless red menu">
        <div class="header item">
            <div class="ui image">
                <img src="../static/images/tenlogo.png" alt="">
            </div>
        </div>

        <div class="right menu">
            <div class="item">
                <h5 class="ui inverted header">
                        <div class="ui mini circular image">
                            <img src="../static/images/hou30.jpg" alt="">
                        </div>

                        <span>admin</span>

                    </h5>
            </div>
            <div class="item">

                <a href="#logout/" class="ui inverted circular button">Logout</a>

            </div>
        </div>
    </div>
    <div class="ui inverted segment container nav">
        <div class="ui  three borderless  item  menu">
            <a class="item">
                        All
                    </a>
            <a class="item">
                        New
                    </a>


            <a class="active item" href="#list/editors">
                        Editor's
                    </a>

        </div>
    </div>



    <div class="ui basic segment container content">

        <div class="ui three column grid">

            {% for  video in  video_list %}
                <div class="column">
                    <a class="ui fluid card" href="#detail/215">
                        <div class="image">
                            <img src="../static/images/img1.jpg" alt="" style="height:200px;object-fit: cover;">
                        </div>
                    </a>


                    <div class="title header" href="/detail/215">{{ video.title }}</div>

                    <i class="icon grey unhide"></i>
                    <span style="color:#bbbbbb">10K</span>
                    <span class="" style="color:rgb(226, 226, 226)">|</span>
                    <i class="icon grey checkmark"></i>
                    <span style="color:#bbbbbb"> 10 people got it</span>

                </div>
            {% endfor %}


        </div>
    </div>



    <div class="ui center aligned very padded vertical segment container">
        <div class="ui pagination menu">

            <a href="#" class="item">
                <i class="icon red left arrow"></i>
            </a>



            <a href="#" class="item">
                <i class="icon red right arrow"></i>
            </a>
        </div>
    </div>
</body>

</html>

View Code

5.faker库的使用

　　参考博客

　　http://hao.jobbole.com/python-faker/

　　http://blog.csdn.net/xiaodongxiexie/article/details/77067492

　　https://github.com/joke2k/faker

　　（1）安装faker库

> pip install faker

　　（2）导入faker库

#第一种
from faker import Faker

#Faker.py 文件
from faker.generator import Generator
from faker.factory import Factory

Faker = Factory.create


#第二种
from faker import Factory

　　（3）生成虚假数据

>>> faker_1 = faker.Faker()
>>> faker_1.name()
'Thomas Lynn'
>>> faker_1.text()
'Boy civil better tax policy realize. And least dinner seem both rate. Never simply case test opportunity.'
>>> faker_1.text()

'Environmental offer size west.
Reality billion necessary all candidate third. Across go different human.
Piece production section table painting magazine
 drop. Friend explain wife couple.'
>>>
>>> faker_1.pybool()
False
>>> faker_1.pybool()
False

　图片文件url.txt

https://pixabay.com/static/uploads/photo/2016/08/25/19/10/mill-1620440__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/17/47/eggplant-1659784__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/16/17/20/elevator-1598431__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/13/58/algodones-dunes-1654439__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/20/52/milky-way-1655504__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/19/56/lions-1660044__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/23/48/bridge-1660417__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/18/38/dovetail-1655098__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/17/18/15/tabletop-photography-1601184__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/20/14/sunset-1645103__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/19/18/50/fruit-1605921__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/15/20/29/olive-oil-1596417__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/13/35/doll-1636128__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/12/00/starry-sky-1654074__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/19/43/sunrise-1637376__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/19/53/pocket-watch-1637396__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/11/01/landscape-1619283__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/29/21/29/lotus-flower-1629225__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/07/16/19/bremen-town-musicians-1651945__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/19/10/mill-1620440__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/27/22/55/sunset-1625073__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/30/11/59/cobweb-1630493__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/18/24/rk5161-1636868__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/27/20/03/berries-1546125__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/20/44/elan-1623088__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/09/21/54/yellowstone-national-park-1581879__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/15/15/55/dachshund-1519374__340.jpg
https://pixabay.com/static/uploads/photo/2016/05/28/07/04/women-1421096__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/17/54/sunset-1626515__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/13/15/28/lake-tahoe-1590923__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/09/40/water-lily-1585178__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/31/19/26/fischer-1559753__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/22/35/tomatoes-1587130__340.jpg
https://pixabay.com/static/uploads/photo/2016/04/22/16/42/mt-fuji-1346096__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/23/47/yosemite-1590013__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/01/20/13/girl-1561989__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/14/geese-1622692__340.jpg
https://pixabay.com/static/uploads/photo/2016/03/09/03/49/tarantula-nebula-1245253__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/23/55/redwood-national-park-1587301__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/33/landscape-1622739__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/21/40/eurasian-eagle-owl-1642795__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/22/59/dahlia-1627138__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/19/motion-1641793__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/08/46/butterfly-1643510__340.jpg
https://pixabay.com/static/uploads/photo/2015/12/17/02/22/milky-way-1096815__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/12/05/sun-flower-1643794__340.jpg
https://pixabay.com/static/uploads/photo/2015/08/20/02/46/arch-896900__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/23/17/flowers-1642964__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/44/dahlia-1642464__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/15/motion-1641781__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/14/15/doll-1636212__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/15/13/motion-1641979__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/19/35/griffith-observatory-1642514__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/23/58/fig-1590016__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/09/21/54/patagonia-1581878__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/11/30/san-francisco-1633202__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/40/dahlia-1642455__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/35/mackinac-bridge-1642445__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/20/44/sunrise-1642695__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/15/sunrise-1641780__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/27/17/34/camel-1624643__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/23/18/sun-flower-1627179__340.jpg
https://pixabay.com/static/uploads/photo/2016/02/13/16/15/sunset-1198134__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/18/48/jefferson-memorial-1626580__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/27/23/07/salt-lake-1625125__340.jpg
https://pixabay.com/static/uploads/photo/2016/06/05/21/46/goat-1438254__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/16/13/50/sun-flower-1521852__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/30/mountains-1622731__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/14/25/rose-1619566__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/15/08/22/greece-1594689__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/13/31/chile-house-1633433__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/14/35/italy-1633682__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/14/23/father-1633655__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/11/29/detail-1633198__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/20/44/elan-1623087__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/20/14/yellowstone-1589614__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/20/27/amber-1623059__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/26/21/02/arielle-1543832__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/23/48/pismo-beach-1587289__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/14/12/catalina-island-1588654__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/17/47/eggplant-1659784__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/16/17/20/elevator-1598431__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/13/58/algodones-dunes-1654439__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/20/52/milky-way-1655504__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/19/56/lions-1660044__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/10/23/48/bridge-1660417__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/18/38/dovetail-1655098__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/17/18/15/tabletop-photography-1601184__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/20/14/sunset-1645103__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/19/18/50/fruit-1605921__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/15/20/29/olive-oil-1596417__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/13/35/doll-1636128__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/08/12/00/starry-sky-1654074__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/19/43/sunrise-1637376__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/19/53/pocket-watch-1637396__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/11/01/landscape-1619283__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/29/21/29/lotus-flower-1629225__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/07/16/19/bremen-town-musicians-1651945__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/19/10/mill-1620440__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/27/22/55/sunset-1625073__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/30/11/59/cobweb-1630493__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/18/24/rk5161-1636868__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/27/20/03/berries-1546125__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/20/44/elan-1623088__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/09/21/54/yellowstone-national-park-1581879__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/15/15/55/dachshund-1519374__340.jpg
https://pixabay.com/static/uploads/photo/2016/05/28/07/04/women-1421096__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/17/54/sunset-1626515__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/13/15/28/lake-tahoe-1590923__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/09/40/water-lily-1585178__340.jpg
https://pixabay.com/static/uploads/photo/2016/07/31/19/26/fischer-1559753__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/22/35/tomatoes-1587130__340.jpg
https://pixabay.com/static/uploads/photo/2016/04/22/16/42/mt-fuji-1346096__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/23/47/yosemite-1590013__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/01/20/13/girl-1561989__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/14/geese-1622692__340.jpg
https://pixabay.com/static/uploads/photo/2016/03/09/03/49/tarantula-nebula-1245253__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/11/23/55/redwood-national-park-1587301__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/33/landscape-1622739__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/21/40/eurasian-eagle-owl-1642795__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/22/59/dahlia-1627138__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/19/motion-1641793__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/08/46/butterfly-1643510__340.jpg
https://pixabay.com/static/uploads/photo/2015/12/17/02/22/milky-way-1096815__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/04/12/05/sun-flower-1643794__340.jpg
https://pixabay.com/static/uploads/photo/2015/08/20/02/46/arch-896900__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/23/17/flowers-1642964__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/44/dahlia-1642464__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/15/motion-1641781__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/01/14/15/doll-1636212__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/15/13/motion-1641979__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/19/35/griffith-observatory-1642514__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/12/23/58/fig-1590016__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/09/21/54/patagonia-1581878__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/11/30/san-francisco-1633202__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/40/dahlia-1642455__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/18/35/mackinac-bridge-1642445__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/20/44/sunrise-1642695__340.jpg
https://pixabay.com/static/uploads/photo/2016/09/03/14/15/sunrise-1641780__340.jpg
https://pixabay.com/static/uploads/photo/2016/02/13/16/15/sunset-1198134__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/28/18/48/jefferson-memorial-1626580__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/26/17/30/mountains-1622731__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/25/14/25/rose-1619566__340.jpg
https://pixabay.com/static/uploads/photo/2016/08/31/13/31/chile-house-1633433__340.jpg
https://cdn.pixabay.com/photo/2016/11/21/12/26/concrete-1845046_1280.jpg

View Code

　　（4）生成数据库表字段，然后注释掉

　　（5）model.py文件

from django.db import models
from faker import Factory

class Video(models.Model):
    """Video表字段"""
    title = models.CharField(null=True, blank=True, max_length=300)  # 文章标题
    content = models.TextField(null=True)  # 视频解说内容
    url_image = models.URLField(null=True, blank=True)  # 封面 网上的图片
    editors_choice = models.BooleanField(default=False)  # 文章分类用的

    def __str__(self):
        return self.title

# f = open('/Users/Administrator/Desktop/111.txt', 'r')
# fake = Factory.create()
#
# for url in f.readlines():
#     v = Video(
#         title=fake.text(max_nb_chars=90),
#         content=fake.text(max_nb_chars=3000),
#         url_image=url,
#         editors_choice=fake.pybool(),
#         )
#     v.save()

　　（6）修改Tempate模板的图片

　　（7）listing.html

<!DOCTYPE html>
{% load staticfiles %}
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="../static/css/semantic.css" media="screen" title="no title" charset="utf-8">
    <link rel="stylesheet" href="../static/css/list_custom.css" media="screen" title="no title" charset="utf-8">
    <link href="https://fonts.googleapis.com/css?family=Oswald|Raleway" rel="stylesheet">

</head>

<body>
    <div class="ui inverted top fixed menu borderless red menu">
        <div class="header item">
            <div class="ui image">
                <img src="../static/images/tenlogo.png" alt="">
            </div>
        </div>

        <div class="right menu">
            <div class="item">
                <h5 class="ui inverted header">
                        <div class="ui mini circular image">
                            <img src="../static/images/hou30.jpg" alt="">
                        </div>

                        <span>admin</span>

                    </h5>
            </div>
            <div class="item">

                <a href="#logout/" class="ui inverted circular button">Logout</a>

            </div>
        </div>
    </div>
    <div class="ui inverted segment container nav">
        <div class="ui  three borderless  item  menu">
            <a class="item">
                        All
                    </a>
            <a class="item">
                        New
                    </a>


            <a class="active item" href="#list/editors">
                        Editor's
                    </a>

        </div>
    </div>



    <div class="ui basic segment container content">

        <div class="ui three column grid">

            {% for  video in  video_list %}
                <div class="column">
                    <a class="ui fluid card" href="#detail/215">
                        <div class="image">
                            <img src="{{ video.url_image }}" alt="" style="height:200px;object-fit: cover;">
                        </div>
                    </a>


                    <div class="title header" href="/detail/215">{{ video.title }}</div>

                    <i class="icon grey unhide"></i>
                    <span style="color:#bbbbbb">10K</span>
                    <span class="" style="color:rgb(226, 226, 226)">|</span>
                    <i class="icon grey checkmark"></i>
                    <span style="color:#bbbbbb"> 10 people got it</span>

                </div>
            {% endfor %}


        </div>
    </div>



    <div class="ui center aligned very padded vertical segment container">
        <div class="ui pagination menu">

            <a href="#" class="item">
                <i class="icon red left arrow"></i>
            </a>



            <a href="#" class="item">
                <i class="icon red right arrow"></i>
            </a>
        </div>
    </div>
</body>

</html>

View Code

6.实现分页功能:Django自带的分页器

from django.shortcuts import render
from  website.models import  Video
from django.core.paginator import Paginator
# Create your views here.


def listing(request):
    context = {}
    video_list = Video.objects.all()

    page_rebot = Paginator(video_list, 9)  # 每页9个数据
    video_list = page_rebot.page(request.GET.get('page'))  # get方法取哪一页

    context['video_list'] = video_list
    listing_page = render(request, 'listing.html', context)
    return listing_page

7.实现异常处理

（1）?page=9999或者?page=3kdjaf 两种错误

999 重定向到实际的最后一页；或者404错误
?page=34jfad 页码不是整数数字

（2）异常处理

　（3）实验结果测试

　　（3）代码

from django.shortcuts import render, Http404
from  website.models import  Video
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
# Create your views here.


def listing(request):
    context = {}
    video_list = Video.objects.all()

    page_rebot = Paginator(video_list, 9)  # 每页9个数据
    page_num = request.GET.get('page')

    try:
        video_list = page_rebot.page(page_num)  # get方法取哪一页
    except EmptyPage:
        video_list = page_rebot.page(page_rebot.num_pages)  # 999加载最后一页
        #raise Http404('EmptyPage')  #返回404错误
    except PageNotAnInteger:
        video_list = page_rebot.page(1)        # 432jds 加载第一页

    context['video_list'] = video_list
    listing_page = render(request, 'listing.html', context)
    return listing_page

View Code

8.在模板层实现分页功能

（1）被分页器装载的列表会有：两个方法

　　video_list.has_previous和 video_list.has_next
　　会返回True或False

（2）代码

            {% if video_list.has_previous %}
                <a href="?page={{ video_list.previous_page_number }}" class="item">
                    <i class="icon red left arrow"></i>
                </a>
            {% else %}
                <a href="?page={{ video_list.start_index }}" class="disabled item">
                    <i class="icon left arrow"></i>
                </a>
            {% endif %}


            {% if video_list.has_next  %}
                <a href="?page={{ video_list.next_page_number }" class="item">
                    <i class="icon red right arrow"></i>
                </a>
            {% else %}
                <a href="?page={{ video_list.end_index }" class="disabled item">
                    <i class="icon  right arrow"></i>
                </a>
            {% endif %}

9.实现分类功能

（1）实现分类功能下的分页

　　（2）允许一个view可以匹配多个网址url

　　（3）可选参数

from django.shortcuts import render, Http404
from  website.models import  Video
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
# Create your views here.


def listing(request, cate=None):  #cate可选默认参数
    context = {}

    if cate is None:
        video_list = Video.objects.all()
    if cate == 'editors':
        video_list = Video.objects.filter(editors_choice=True)
    else:
        video_list = Video.objects.all()

    page_rebot = Paginator(video_list, 9)  # 每页9个数据
    page_num = request.GET.get('page')

    try:
        video_list = page_rebot.page(page_num)  # get方法取哪一页
    except EmptyPage:
        video_list = page_rebot.page(page_rebot.num_pages)  # 999加载最后一页
        #raise Http404('EmptyPage')  #返回404错误
    except PageNotAnInteger:
        video_list = page_rebot.page(1)        # 432jds 加载第一页

    context['video_list'] = video_list
    listing_page = render(request, 'listing.html', context)
    return listing_page

View Code

（4）a标签的href

            <a class="active item" href="{% url 'list' %}editors">
                        Editor's
            </a>

　　（5）判断editor是否被激活

url是否有editors字段

　　（6）listing.html 代码

<!DOCTYPE html>
{% load staticfiles %}
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="../static/css/semantic.css" media="screen" title="no title" charset="utf-8">
    <link rel="stylesheet" href="../static/css/list_custom.css" media="screen" title="no title" charset="utf-8">
    <link href="https://fonts.googleapis.com/css?family=Oswald|Raleway" rel="stylesheet">

</head>

<body>
    <div class="ui inverted top fixed menu borderless red menu">
        <div class="header item">
            <div class="ui image">
                <img src="../static/images/tenlogo.png" alt="">
            </div>
        </div>

        <div class="right menu">
            <div class="item">
                <h5 class="ui inverted header">
                        <div class="ui mini circular image">
                            <img src="../static/images/hou30.jpg" alt="">
                        </div>

                        <span>admin</span>

                    </h5>
            </div>
            <div class="item">

                <a href="#logout/" class="ui inverted circular button">Logout</a>

            </div>
        </div>
    </div>
    <div class="ui inverted segment container nav">
        <div class="ui  three borderless  item  menu">
            <a class="item">
                        All
                    </a>
            <a class="item">
                        New
                    </a>


            {% if 'editors' in  request.path  %}
                <a class="active item" href="{% url 'list' %}editors">
                            Editor's
                </a>
            {% else %}
                <a class="item" href="{% url 'list' %}editors">
                            Editor's
                </a>
            {% endif %}


        </div>
    </div>



    <div class="ui basic segment container content">

        <div class="ui three column grid">

            {% for  video in  video_list %}
                <div class="column">
                    <a class="ui fluid card" href="#detail/215">
                        <div class="image">
                            <img src="{{ video.url_image }}" alt="" style="height:200px;object-fit: cover;">
                        </div>
                    </a>


                    <div class="title header" href="/detail/215">{{ video.title }}</div>

                    <i class="icon grey unhide"></i>
                    <span style="color:#bbbbbb">10K</span>
                    <span class="" style="color:rgb(226, 226, 226)">|</span>
                    <i class="icon grey checkmark"></i>
                    <span style="color:#bbbbbb"> 10 people got it</span>

                </div>
            {% endfor %}


        </div>
    </div>



    <div class="ui center aligned very padded vertical segment container">
        <div class="ui pagination menu">

            {% if video_list.has_previous %}
                <a href="?page={{ video_list.previous_page_number }}" class="item">
                    <i class="icon red left arrow"></i>
                </a>
            {% else %}
                <a href="?page={{ video_list.start_index }}" class="disabled item">
                    <i class="icon left arrow"></i>
                </a>
            {% endif %}


            {% if video_list.has_next  %}
                <a href="?page={{ video_list.next_page_number }" class="item">
                    <i class="icon red right arrow"></i>
                </a>
            {% else %}
                <a href="?page={{ video_list.end_index }" class="disabled item">
                    <i class="icon  right arrow"></i>
                </a>
            {% endif %}



        </div>
    </div>
</body>

</html>

View Code

10.上传本地图片

　　（1）添加上传图片字段

from django.db import models
from faker import Factory

class Video(models.Model):
    """Video表字段"""
    title = models.CharField(null=True, blank=True, max_length=300)  # 文章标题
    content = models.TextField(null=True)  # 视频解说内容
    url_image = models.URLField(null=True, blank=True)  # 封面 网上的图片

    cover = models.FileField(upload_to='cover_image', null=True)  #上传图片字段
    
    editors_choice = models.BooleanField(default=False)  # 文章分类用的

    def __str__(self):
        return self.title

　　（2）setting.py 添加上传图片路径

MEDIA_URL = '/upload/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'upload').replace("//", "/")

　　（3）setting.DEBUG开发模式开启的时候:在本地查找

　　　　关闭这个模式，服务器会帮我们解决

from django.conf.urls import url
from django.contrib import admin
from website.views import listing

from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^list/$', listing, name='list'),
    url(r'^list/(?P<cate>[A-Za-z]+)$', listing, name='list'),  #cate 变量
]

if settings.DEBUG:
    urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

　　（4）合并数据库

　　（5）后台上传文件

　　（6）Template 层：如果本地上传的文件存在就不用网络的

查看全文

相关阅读:
2019-12-2 异常捕获
 类与类之间的6种关系
 关键字与理解
 this与super的语法比较
 单继承与多继承对比
 为什么javaBean要有get/set方法的设计
 多态在面向对象中的意义以及带来的好处
 十四、线程设计
 十三、窗口设计
 十二、SWING界面设计

原文地址：https://www.cnblogs.com/venicid/p/8097876.html

7 Django分页器文章分页

2。这节课要解决的问题？

3。分页的原理

4.准备工作

5.faker库的使用

（1）安装faker库

（2）导入faker库

（3）生成虚假数据

图片文件url.txt

（4）生成数据库表字段，然后注释掉

（5）model.py文件

（6） 修改Tempate模板的图片

（7）listing.html

6.实现分页功能:Django自带的分页器

7.实现异常处理

（1）?page=9999或者?page=3kdjaf 两种错误

（3）实验结果测试

（3）代码

8.在模板层实现分页功能

9.实现分类功能

10.上传本地图片

　　（1）安装faker库

　　（2）导入faker库

　　（3）生成虚假数据

　图片文件url.txt

　　（4）生成数据库表字段，然后注释掉

　　（5）model.py文件

　　（6）修改Tempate模板的图片

　　（7）listing.html

　（3）实验结果测试

　　（3）代码