1. Install Python 2.7, Pycharm, PIP (Python Package management tool), Django (Pip install Django)
1 Traceback (most recent):2File"d:/workspace/mydjangoproject/manage.py", Line 10,inch<module>3 execute_from_command_line (SYS.ARGV)4File"D:\Python27\lib\site-packages\django\core\management\__init__.py", line 338,inchExecute_from_command_line5 Utility.execute ()6File"D:\Python27\lib\site-packages\django\core\management\__init__.py", Line 312,inchExecute7 Django.setup ()8File"D:\Python27\lib\site-packages\django\__init__.py", Line 18,inchSetup9 apps.populate (settings. Installed_apps)TenFile"D:\Python27\lib\site-packages\django\apps\registry.py", line 89,inchPopulate One "Duplicates:%s"%App_config.label) ADjango.core.exceptions.ImproperlyConfigured:Application labels Aren't Unique, duplicates:adminShould be the admin configuration conflict, open the setttings.py file, found that the admin configuration is duplicated
1Installed_apps = (2 'Django.contrib.admin',3 'Django.contrib.auth',4 'Django.contrib.contenttypes',5 'django.contrib.sessions',6 'django.contrib.messages',7 'Django.contrib.staticfiles',8 'Django.contrib.admin',9 'Student',Ten)Comment out one row after (why there is this problem, estimate is a bug), reboot, OK 3, Web Project add page at this time, we have not written a line of code, the program Duang run up! Add a Hello World page now. Open a. student/views.py file, enter the following
def SayHello (Request): s = ' Hello world! ' Current_time = Datetime.datetime.now () html = 'To open the url.py file, you need to configure the URL map: url (r ' ^student/', SayHello) when the user enters Http://**/student, the SayHello method is called, and the method is HttpResponse () Returns the page content as a response. Restart the service, Access http://localhost:8000/student/on the views.py page you can return the page to the browser by calling the HttpResponse () class as a response to the element in the form of a string. But in this way, page logic and pages mixed together, handwriting is cumbersome, the workload is relatively large. What if we need to show some dynamic data, and the page basically doesn't change? For example, when users visit http://localhost:8000/student/, we want to show some students ' data on the fly. You can do this: first in the Templates directory, create a new student.html file, the file as a template, the following:1 <!DOCTYPE HTML>2 <HTML>3 <Head>4 <title></title>5 </Head>6 <Body>7 <ul>8 {% for student in students%}9 <Li>Ten id:{{Student.id}}, Name: {{Student.name}},age: {{student.age} } One </Li> A {% endfor%} - </ul> - </Body> the </HTML>Modify the views.py file, add Method Showstudents ()1 defshowstudents (Request):2List = [{id:1,'name':'Jack'}, {id:2,'name':'Rose'}]3 returnRender_to_response ('student.html',{'Students': List})This method binds the list to the template page student.html by using the Render_to_response method as the dynamic data. Add URL map, url (r ' ^showstudents/$ ', showstudents) modify settings.py template configuration: ' DIRS ': [base_dir+r ' \templates '], restart Service, Access/HTTP// Localhost:8000/showstudents, appears: So far, we have been able to properly bind some "dynamic" data to the template. But how do you access the database? Get the data you need from the database and show it on the page? First you need to install the database driver, namely Mysql_python, then configure the database connection:1DATABASES = {2 'default': {3 ' ENGINE': 'django.db.backends.mysql', 4 'NAME':'Student',5 'USER':'Root',6 'PASSWORD':'1234',7 'HOST':'127.0.0.1',8 'PORT':'3306',9 #' NAME ': Os.path.join (Base_dir, ' db.sqlite3 '),Ten } One}after the configuration is complete, you need to check that the database configuration is correct and use the manage.py shell command to enter the shell interface:Input:If you do not have an error, the configuration is correct. Create model, open models.py, define model as follows:1 from Import Connection 2 cursor = Connection.cursor ()Then call manage.py syncdb Normally, after this step is done, the model will be consistent with the database. However, in the test, when the command was executed successfully, it was discovered that the database did not establish the table. For this situation, do the following to normal:(1) Comment out models.py file code, execute manage.py makemigerations student"and manage.py migerate--fake"(2) Open comment, execute "manage.py makemigerations student and" manage.py migerate commandthrough the above two steps, it can be normal operationAdd method in views.py: showrealstudents1 class Student (models. Model):2 id = models. Bigintegerfield3 name = models. Charfield (max_length=20, default='a')urls.py Add Map URL (r ' ^showrealstudents/$ ', showrealstudents) Restart service, open connection: http://localhost:8000/showRealStudents page output is normal. Now, with Django, you can manipulate the database, customize the template, and show the data on the page.1 def showrealstudents (Request): 2 List = Student.objects.all ()3 return render_to_response (' student.html', {'students': List}Python & Pycharm & Django Build a Web development environment
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