class RegisterForm(Form):    # user_id=fields.IntegerField()    username=fields.CharField(        max_length=12,        min_length=4,        required=True,        error_messages={'required':'用户名不能为空','invalid':'输入不合规'},        # widget = widgets.TextInput(attrs={'class': 'form-control loon luser'})        widget = widgets.TextInput(attrs={'class': 'form-control loon luser','value':'用户名'})    )    password = fields.CharField(        required=True,        max_length=32,        min_length=6,        error_messages={'required': '密码不能为空', 'invalid': '输入不合规'},        # widget=widgets.TextInput(attrs={'class': 'form-control loon lpass'})        widget=widgets.TextInput(attrs={'class': 'form-control loon lpass', 'value': '密码'})    )    password_confum = fields.CharField(        required=True,        max_length=32,        min_length=6,        error_messages={'required': '密码不能为空', 'invalid': '输入不合规'},        # widget=widgets.TextInput(attrs={'class': 'form-control loon lpass'})        widget=widgets.TextInput(attrs={'class': 'form-control loon lpass', 'value': '密码'})    )    def clean(self):        print(self.cleaned_data['password'])        print(self.cleaned_data['password_confum'])        if self.cleaned_data['password'] == self.cleaned_data['password_confum']:            return self.cleaned_data        else:            self.add_error('password_confum',ValidationError('密码不一致'))            return self.cleaned_data

通过 clean 函数