input: 
  from flask import Flask, jsonify, request
  from flask_sqlalchemy import SQLAlchemy
  
  app = Flask(__name__)
  app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
  db = SQLAlchemy(app)
  
  class BlogPost(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200))
    content = db.Column(db.Text)
  
    def serialize(self):
      return {'id': self.id, 'title': self.title, 'content': self.content}
  
  @app.route('/post', methods=['POST'])
  def create_post():
    data = request.get_json()
    post = BlogPost(title=data['title'], content=data['content'])
    db.session.add(post)
    db.session.commit()
    return jsonify(post.id)
  
  @app.route('/posts', methods=['GET'])
  def get_posts():
    posts = BlogPost.query.all()
    return jsonify([post.serialize() for post in posts])
  
  @app.route('/post/<id>', methods=['GET'])
  def get_post(id):
    post = BlogPost.query.filter_by(id=id).first()
    return jsonify(post.serialize())
  
  @app.route('/post/<id>', methods=['PUT'])
  def edit_post(id):
    data = request.get_json()
    post = BlogPost.query.filter_by(id=id).first()
    post.title = data['title']
    post.content = data['content']
    db.session.commit()
    return jsonify(post.serialize())
  
  @app.route('/post/<id>', methods=['DELETE'])
  def delete_post(id):
    post = BlogPost.query.filter_by(id=id).first()
    db.session.delete(post)
    db.session.commit()
    return jsonify({'message': 'Post deleted'})
  
  if __name__ == '__main__':
    app.run(debug=True)
  
output:     
      if post is None:
          return jsonify({'error': 'Post not found'}), 404
  