如何指定FormView模板中使用的表单变量的名称？ （表单的object_context_name）

from forms import MyContactForm
from django.views.generic.edit import FormView 

class MyFormView(FormView):
    template_name = 'my_forms.html'                                      
    form_class = MyContactForm  
    success_url = '/thanks/' 
from forms import MyContactForm
from django.vie