Django入门1——第一个例子及修改

1.创建工程

$ django-admin startproject mysite

2.目录结构

运行：

$ python manage.py runserver

在浏览器中输入：127.0.0.1:8000
看到如下界面，说明成功

3.django-admin工具

使用：django-admin help查看命令：

$ django-admin help

Type 'django-admin help <subcommand>' for help on a specific subcommand.

Available subcommands:

[django]
    check
    compilemessages
    createcachetable
    dbshell
    diffsettings
    dumpdata
    flush
    inspectdb
    loaddata
    makemessages
    makemigrations
    migrate
    runserver
    sendtestemail
    shell
    showmigrations
    sqlflush
    sqlmigrate
    sqlsequencereset
    squashmigrations
    startapp
    startproject
    test
    testserver
Note that only Django core commands are listed as settings are not properly configured (error: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.).

4.新建一个App

4.1创建app

$ python manage.py startapp helloapp
$ cd helloapp
$ ll
total 5
-rw-r--r-- 1 PrinceTeng 197121  0 2月  16 16:45 __init__.py
-rw-r--r-- 1 PrinceTeng 197121 66 2月  16 16:45 admin.py
-rw-r--r-- 1 PrinceTeng 197121 96 2月  16 16:45 apps.py
drwxr-xr-x 1 PrinceTeng 197121  0 2月  16 16:45 migrations/
-rw-r--r-- 1 PrinceTeng 197121 60 2月  16 16:45 models.py
-rw-r--r-- 1 PrinceTeng 197121 63 2月  16 16:45 tests.py
-rw-r--r-- 1 PrinceTeng 197121 66 2月  16 16:45 views.py

4.2 修改应用目录下的views.py

from django.shortcuts import render
from django.http import HttpResponse #增加

# Create your views here.
def hello(request):
    return HttpResponse("hello, i am coming")

4.3 修改mysite子目录下的urls.py

from django.contrib import admin
from django.urls import path
from helloapp import views

urlpatterns = [
    path('index/', views.hello),
    path('admin/', admin.site.urls),
]

path函数的第一个参数为url，第二个参数是处理这个url所使用的函数。

4.4 运行

命令行输入：

$ python manage.py runserver

在浏览器输入地址：http://127.0.0.1:8000/index/
返回内容：

成功！

5.总结

1.新建工程：django-admin startproject [projectname]
2.新建App：python manage.py startapp [appname]
3.修改projectname/appname/views.py，增加url处理函数
4.修改projectname/projectname/urls.py，增加url与处理函数的关联
5.运行服务器：python manage.py runserver
6.浏览器输入url测试