input: 
  def crud_operations_api():
      """Generate a REST API with Python and Flask that allows users to create, read, update, 
      and delete records from a database.
      
      >>> crud_operations_api()
      from flask import Flask, request
      from flask_sqlalchemy import SQLAlchemy
      
      app = Flask('app')
      app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
      db = SQLAlchemy(app)
      
      class Record(db.Model):
          id = db.Column(db.Integer, primary_key=True)
          name = db.Column(db.String(120), unique=True)
      
      db.create_all()
      
      @app.route('/records', methods=['GET'])
      def get_records():
          records = Record.query.all()
          return {'records':[record.name for record in records]}
      
      @app.route('/records', methods=['POST'])
      def create_record():
          record = Record(name=request.json['name'])
          db.session.add(record)
          db.session.commit()
          return {'id': record.id}
      
      @app.route('/records/<int:id>', methods=['PUT'])
      def update_record(id):
          record = Record.query.get(id)
          record.name = request.json['name']
          db.session.commit()
          return {'message': 'Record updated'}
      
      @app.route('/records/<int:id>', methods=['DELETE'])
      def delete_record(id):
          Record.query.filter_by(id=id).delete()
          db.session.commit()
          return {'message': 'Record deleted'}
      
      if __name__ == '__main__':
          app.run(debug=True)
      """
  
output:     from flask import Flask, request
      from flask_sqlalchemy import SQLAlchemy
      
      app = Flask('app')
      app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
      db = SQLAlchemy(app)
      
      class Record(db.Model):
          id = db.Column(db.Integer, primary_key=True)
          name = db.Column(db.String(120), unique=True)
      
      db.create_all()
      
      @app.route('/records', methods=['GET'])
      def get_records():
          records = Record.query.all()
          return {'records':[record.name for record in records]}
      
      @app.route('/records', methods=['POST'])
      def create_record():
          record = Record(name=request.json['name'])
          db.session.add(record)
          db.session.commit()
          return {'id': record.id}
      
      @app.route('/records/<int:id>', methods=['PUT'])
      def update_record(id):
          record = Record.query.get(id)
          record.name = request.json['name']
          db.session.commit()
          return {'message': 'Record updated'}
      
      @app.route('/records/<int:id>', methods=['DELETE'])
      def delete_record(id):
          Record.query.filter_by(id=id).delete()
          db.session.commit()
          return {'message': 'Record deleted'}
      
      if __name__ == '__main__':
          app.run(debug=True)