Django之Form功能

from django.forms import Form
from django.forms import fields
class LoginForm(Form):
    # 正则验证: 不能为空,6-18
    username = fields.CharField(
        max_length=18,
        min_length=6,
        required=True,
        error_messages={
            'required': '用户名不能为空',
            'min_length': '太短了',
            'max_length': '太长了',
        }
    )
    # 正则验证: 不能为空，16+
    password = fields.CharField(min_length=4,required=True)
    # email = fields.EmailField()
    # email = fields.GenericIPAddressField()
    # email = fields.IntegerField()


def login(request):
    if request.method == "GET":
        return render(request,'login.html')
    else:
       obj = LoginForm(request.POST)
       if obj.is_valid():
           # 用户输入格式正确
           print(obj.cleaned_data) # 字典类型
           return redirect('http://www.baidu.com')
       else:
           # 用户输入格式错误
           return render(request,'login.html',{'obj':obj})

urls.py
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^login/',views.login),
    #url(r'^test/',views.test),
]

 <form method="POST" action="/login/">
        {% csrf_token %}
        <p>
            用户：<input type="text" name="username"/>{{ obj.errors.username.0 }}
        </p>
        <p>
            密码：<input type="password" name="password"/>{{ obj.errors.password.0 }}
        </p>
        <input type="submit" value="提交" />{{ msg }}
    </form>