def METHOD_NAME(modname):
    """'Forget' a module was ever imported.
    This removes the module from sys.modules and deletes any PEP 3147/488 or
    legacy .pyc files.
    """
    unload(modname)
    for dirname in sys.path:
        source = os.path.join(dirname, modname + '.py')
        # It doesn't matter if they exist or not, unlink all possible
        # combinations of PEP 3147/488 and legacy pyc files.
        unlink(source + 'c')
        for opt in ('', 1, 2):
            unlink(importlib.util.cache_from_source(source, optimization=opt))