Django知识点

urlpatterns = [
    url(r‘^admin/‘, admin.site.urls),
    url(r‘^index/‘, views.index),
]
views.index调用即index（）时默认会传入一个request

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无名分组：
    urlpatterns = [
        url(r‘^archive/(\d+)‘, views.archive),
    ]

    备注：url(r‘^archive/(\d+)‘, views.archive),
    1：\d+表示匹配一个或多个数字:
    2：此处的加括号()表示分组，对应的函数archive（）可以多传一个值
    views.py里
        def archive(request,id)：此处的id是(\d+)传递的


http://127.0.0.1:8001/archive/12
def archive(request,id):
    return HttpResponse( id)打印结果为12

url(r‘^archive/(\d+)$‘, views.archive),匹配结尾的
-------------------------------------------
同时接收两个值需要两个\d均加括号，才能传递给视图函数
http://127.0.0.1:8001/archive2/2014/12
url(r‘^archive2/(\d{4})/(\d{2})‘, views.archive2),
def archive2(request,year,month):
    return HttpResponse(year+month)
------------------------------------------

-----------------------------------------------------
有名分组（就是Python的关键字参数形式传给视图）：
    定义：
        urlpatterns = [
            url(r‘^archive2/(?P<y>\d+)/(?P<m>\d{2})‘, views.archive2),
        ]
        1、(\d+)
        2在前半括号后加?P<y>
         2.1：?P<>固定形式
         2.2：y表示虚参，随便定义
     调用：
         def archive2(request,y,m):
            return HttpResponse(y+m)
----------------------------------------------------------------------------

多个应用时用：
多个应用的url都放在全局的urls.py里不合适也很麻烦，需要做到解耦

项目的urls.py文件需要导入include
from django.conf.urls import url,include
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r‘^app01/‘, include(‘app01.url‘)),
]

应用的url
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r‘^archive/(\d+)$‘, views.archive),
    url(r‘^archive2/(?P<y>\d+)/(?P<m>\d{2})‘, views.archive2),
]

def index(request):
    # book_list=Book.objects.filter(price__gt=39) #价格大于39元的书
    # book_list = Book.objects.filter(price__lt=8)#价格大于39元的书
    # book_list = Book.objects.filter(title__contains=‘py‘)#title包含py的书
    # book_list = Book.objects.filter(title__startswith=‘py‘)#title以py开头的书
    # book_list = Book.objects.filter(title__endswith=‘va‘)  # title以va结尾的书
    # book_list = Book.objects.filter(price__in=[8,9,10])#价格在[8,9,10]列表里的书
    book_list = Book.objects.filter(price__range=[20,89])  # 价格在20到89之间的的书
    return render(request,‘query.html‘,{"book_list":book_list})