class F1Form(forms.Form):
 username = fields.CharField(max_length=18,min_length=2,required=True)
 pwd = fields.CharField(required=True,max_length=16,min_length=6)
 age = fields.IntegerField(required=True)
 email = fields.EmailField(required=True)

class F1Form(forms.Form):
 username = fields.CharField(max_length=18,
 min_length=6,
 required=True,
 error_messages={
   'required':'用户名不能为空',
   'min_length':'用户名过短',
   'max_length':'用户名过长'
 }
 )

def rege(req):
 obj = F1Form()
 return render(req,'rege.html',{'OBJ':obj})

<form action="">
 <p>{{ OBJ.username }}</p>
 <p>{{ OBJ.pwd }}</p>
 <p>{{ OBJ.age }}</p>
 <p>{{ OBJ.email }}</p>
</form>

obj = F1Form(req.POST)
if obj.is_valid(): #判断传来的值是否通过验证
 models.UserInfo.objects.create(**obj.cleaned_data) #将值写入数据库