title: http://127.0.0.1:5000/post/0 isnt working
body: <pre><code>from flask import Flask   
  
  app = Flask(__name__)
  posts = {0: dict(title='Hello World', content='This is my first ever post !'}
  
  @app.route('/')
  def home():
      return 'Hello World!'
  
  @app.route('/post/(int:post_id)') 
  def post(post_id):
      post = posts.get(post_id)
      return f"Post {post['title']} , content:\n\n{post['content']}"
  
  if __name__ == '__main__':
      app.run(debug=True)
  </code></pre>