config.py

import os

basedir = os.path.abspath(os.path.dirname(__file__))

class Config:
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    JSON_AS_ASCII = False

    @staticmethod
    def init_app(app):
        pass

class DevelopmentConfig(Config):
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('DEV_DATABASE_URL') or 'mysql://cfomp:root123@127.0.0.1:3306/netmap'

class ProductionConfig(Config):
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'data.sqlite')
    @classmethod
    def init_app(app):
        Config.init_app(app)

class DockerConfig(ProductionConfig):
    @classmethod
    def init_app(cls, app):
        ProductionConfig.init_app(app)

        # log to stderr
        import logging
        from logging import StreamHandler
        file_handler = StreamHandler()
        file_handler.setLevel(logging.INFO)
        app.logger.addHandler(file_handler)

config = {
    'development': DevelopmentConfig,
    'default': DevelopmentConfig,
    'production': ProductionConfig,
    'docker': DockerConfig
}