django adds %EF%BB%BF at the end of my urls - html

Question

I am working on a blog django app.
I have list of posts and a post detail pages.
when I click on a post title in the list should takes to the post detail page.
views.py
from django.shortcuts import render, get_list_or_404
from .models import Post
def list_of_post(request):
post = Post.objects.all()
template = 'blog/post/list_of_post.html'
context = {'post': post}
return render(request, template, context)
def post_detail(request, slug):
post = get_list_or_404(Post, slug=slug)
template = 'blog/post/post_detail.html'
context = {'post': post}
return render(request, template, context)
urls.py
from django.conf.urls import url
from . import views
urlpatterns = [
url(r'^$', views.list_of_post, name='list_of_post'),
url(r'^(?P<slug>[-\w]+)/$', views.post_detail, name='post_detail')
]
models.py
from django.db import models
from django.utils import timezone
from django.core.urlresolvers import reverse
from django.contrib.auth.models import User
class Post(models.Model):
STATUS_CHOICES = (
('draft', 'Draft'),
('published', 'Published')
)
title = models.CharField(max_length=250)
slug = models.SlugField(max_length=250)
content = models.TextField()
seo_title = models.CharField(max_length=250)
seo_description = models.CharField(max_length=160)
author = models.ForeignKey(User, related_name='blog_posts')
published = models.DateTimeField(default=timezone.now)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
status = models.CharField(max_length=9, choices=STATUS_CHOICES, default='draft')
def get_absolute_url(self):
return reverse('blog:post_detail', args=[self.slug])
def __str__(self):
return self.title
list_of_post.html
{% extends 'blog/base.html' %}
{% block title %}List of blog post{% endblock %}
{% block content %}
{% for posts in post %}
<h2>{{ posts.title }}</h2>
<p>Written by {{ posts.author }} on {{ posts.published }}</p>
<hr>
{{ posts.content|truncatewords:40|linebreaks }}
{% endfor %}
{% endblock %}
for some reason the url doesn't work. instead shows 404 that looks like this :
Page not found (404)
Request Method: GET
Request URL: http://127.0.0.1:8000/blog/practice-title/%EF%BB%BF
Using the URLconf defined in cms.urls, Django tried these URL patterns,in this order:
^admin/
^blog/ ^$ [name='list_of_post']
^blog/ ^(?P<slug>[-\w]+)/$ [name='post_detail']
The current URL, blog/practice-title/, didn't match any of these.
You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.
and ideas?