Function _flatten

Lib/tkinter/__init__.py:91–99

Internal function.

(seq)

def _flatten(seq):
    """Internal function."""
    res = ()
    for item in seq:
        if isinstance(item, (tuple, list)):
            res = res + _flatten(item)
        elif item is not None:
            res = res + (item,)
    return res


try: _flatten = _tkinter._flatten