text: __author__ = 'Tauren'
  
  import os
  from sqlalchemy.engine import create_engine
  
  SQLALCHEMY_DATABASE_URI = 'postgresql://%s:%s@%s/%s' % (
      os.getenv('DB_USERNAME'),
      os.getenv('DB_PASSWORD'),
      os.getenv('DB_URL'),
      os.getenv('DB_NAME')
  )
  
  db = create_engine(SQLALCHEMY_DATABASE_URI)
  