Django Form form modifies data

Form

#!/usr/bin/env Python#coding:utf8 from django.forms import Form,modelformimport models class Coursemodelform (ModelForm ):    class Meta:        model = models. Course        exclude = ()     def __init__ (Self,*args,**kwargs):        super (Coursemodelform,self). __init__ (*args,** Kwargs) for         fieldname in Self.base_fields:  #循环给所有字段加样式            field = Self.base_fields[fieldname]            Field.widget.attrs.update ({' Class ': ' Form-control '})

Back end:

def mod_course (request,customer_id):    print ("Go to Revision Course")    course_obj = Course.objects.get (id=customer_id)    if Request.method = = ' POST ': #使用form做数据修改        form = forms. Coursemodelform (Request. Post,instance=course_obj) #获取POST修改后的数据        if Form.is_valid (): #判断是否满足form条件            form.save ()        return Redirect ( '/course/')    print ("customer_id===========>", customer_id)    print (course_obj)    form = forms. Coursemodelform (instance=course_obj)    return render (Request, ' course_mod.html ', {' Course_form ': Form})

Front:

{% extends ' index.html '%} {% block Head-menu%}    <H2 style= "margin-left:5%" >course modified
Django Form form modifies data