text: from app import create_app,db
  from flask_script import Manager,Server
  from flask_migrate import Migrate,MigrateCommand
  
  
  from app.models import User,BlogPost,Comment,Role
  
  #creating app instance
  app=create_app('development')
  # app=create_app('production')
  
  #creating manager instance
  manager=Manager(app)
  manager.add_command('server',Server)
  
  migrate=Migrate(app,db)
  manager.add_command('db',MigrateCommand)
  
  @manager.shell
  def make_shell_context():
      return dict(app=app,db=db,User=User,BlogPost=BlogPost,Role=Role,Comment=Comment)
  
  if __name__=='__main__':
      manager.run()    