config.py

import os


class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'hard to guess string'

    @staticmethod
    def init_app(app):
        pass


class DevelopmentConfig(Config):
    DEBUG = True


# class TestingConfig(Config):


# class ProductionConfig(Config):


config = {
    'development': DevelopmentConfig,
    # 'testing': TestingConfig,
    # 'production': ProductionConfig,

    'default': DevelopmentConfig
}