def message(mes):
    """Dedicated print function to include in Snakefiles

    In a Snakefile, the stand print function may interfer with other process
    An example is the creation of the dag file. Not sure this is a bug but
    meanwhile, one must use this function to print information.

    This adds the // -- characters in front of the prin statements."""
    from easydev.console import purple
    print('// -- ' + purple(mes))
