.ini file load environment variable

I've solved the problem by setting sqlalchemy.url in env.py as @dirn suggested.

config.set_main_option('sqlalchemy.url', <db_uri>) did the trick, where <db_uri> can be loaded from environment or config file.

I was looking for a while how to manage this for mutli-databases

Here is what I did. I have two databases : logs and ohlc

According to the doc,I have setup the alembic like that

alembic init --template multidb

alembic.ini

databases = logs, ohlc[logs]sqlalchemy.url = postgresql://botcrypto:botcrypto@localhost/logs[ohlc]sqlalchemy.url = postgresql://botcrypto:botcrypto@localhost/ohlc

env.py

[...]# this is the Alembic Config object, which provides# access to the values within the .ini file in use.config = context.config# Interpret the config file for Python logging.# This line sets up loggers basically.fileConfig(config.config_file_name)logger = logging.getLogger('alembic.env')# overwrite alembic.ini db urls from the config filesettings_path = os.environ.get('SETTINGS')if settings_path:    with open(settings_path) as fd:        settings = conf.load(fd, context=os.environ) # loads the config.yml    config.set_section_option("ohlc", "sqlalchemy.url", settings["databases"]["ohlc"])    config.set_section_option("logs", "sqlalchemy.url", settings["databases"]["logs"])else:    logger.warning('Environment variable SETTINGS missing - use default alembic.ini configuration')[...]

config.yml

databases:    logs: postgresql://botcrypto:botcrypto@127.0.0.1:5432/logs    ohlc: postgresql://botcrypto:botcrypto@127.0.0.1:5432/ohlc

usage

SETTINGS=config.yml alembic upgrade head

Hope it can helps !