flask-deploy-2-config.py

import os

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'secret string'


class DevelopmentConfig(Config):
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('DEV_DATABASE_URL')


class TestingConfig(Config):
    TESTING = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('TEST_DATABASE_URL')


class StagingConfig(Config):
    SQLALCHEMY_DATABASE_URI = os.environ.get('STAGING_DATABASE_URL')


class ProductionConfig(Config):
    SQLALCHEMY_DATABASE_URI = os.environ.get('PRODUCTION_DATABASE_URL')


config = {
    'development': DevelopmentConfig,
    'testing': TestingConfig,
    'staging': StagingConfig,
    'production': ProductionConfig
}