django的form的常用组件

 class TestForm(Form):#     t1 = fields.CharField(#         widget=widgets.Textarea(attrs={})#     )###     t2 = fields.CharField(#         widget=widgets.CheckboxInput#     )##     t3 = fields.MultipleChoiceField(#         choices=[(1,'篮球'),(2,'足球'),(3,'溜溜球')],#         widget=widgets.CheckboxSelectMultiple#     )##     t4 = fields.ChoiceField(#         choices=[(1,'篮球'),(2,'足球'),(3,'溜溜球')],#         widget=widgets.RadioSelect#     )    # t5 = fields.FileField(    #     widget=widgets.FileInput    # )    # def clean_t1(self):    #     passfrom django.core.exceptions import ValidationErrorclass TestForm(Form):    user = fields.CharField(validators=[])    pwd = fields.CharField()    def clean_user(self):        v = self.cleaned_data['user']        if models.Student.objects.filter(name=v).count():            raise ValidationError('用户名已经存在')        return self.cleaned_data['user']    def clean_pwd(self):        return self.cleaned_data['pwd']    def clean(self):        # user = self.cleaned_data.get('user')        # email = self.cleaned_data.get('email')        # if models.Student.objects.filter(user=user,email=email).count():        #     raise ValidationError('用户名和邮箱联合已经存在')        return self.cleaned_data    # def _post_clean(self):    #     """    #     An internal hook for performing additional cleaning after form cleaning    #     is complete. Used for model validation in model forms.    #     """    #     passdef test(request):    obj = TestForm(initial={'t3':[2,3]})    obj.is_valid()    return render(request,'test.html',{'obj':obj})