provided with the subdirectories of a given directory, check if this is
    a tomodir

def is_tomodir(subdirectories):
    """provided with the subdirectories of a given directory, check if this is
    a tomodir
    """
    required = (
        'exe',
        'config',
        'rho',
        'mod',
        'inv'
    )
    is_tomodir = True
    for subdir in required:
        if subdir not in subdirectories:
            is_tomodir = False
    return is_tomodir