如何正确调用来自django中对象ID的url

http://localhost:8000/products/1 . 我试图调用它,但它返回了一些错误。

  <button type="button" class="btn btn-primary"><i class="fa fa-shopping-
   cart">  </i>  <a href="{% url 'products/1' %}"> Add To Cart  </a>
   </button> 

  urls.py-products 
     url(r'^$', ProductListView.as_view(), name='products'),
     url(r'^cbv/(?P<pk>\d+)', ProductDetailView.as_view(), 
     name='product_detail'),
     url(r'^(?P<id>\d+)', 'products.views.product_detail_view_func', 
     name='product_detail_function'),

  main urls.py
  url(r'^products/', include('products.urls')),

  this is the error

 **Reverse for 'products/1' with arguments '()' and keyword arguments '{}' 
 not 
 found. 0 pattern(s) tried: []**