def get(ctx, key):
    # type: (click.Context, Any) -> None
    '''Retrieve the value for the given key.'''
    file = ctx.obj['FILE']
    stored_value = get_key(file, key)
    if stored_value:
        click.echo('%s=%s' % (key, stored_value))
    else:
        exit(1)
Retrieve the value for the given key.
dynaconf/vendor/dotenv/cli.py