from typing import Sequence


def make_tuple(value):
    """Return value as tuple.

    >>> make_tuple((1, 2, 3))
    (1, 2, 3)
    >>> make_tuple('abc')
    ('a', 'b', 'c')
    >>> make_tuple([4, 5, 6])
    (4, 5, 6)
    >>> make_tuple(None)
    (None,)

    """
    if isinstance(value, tuple):
        return value
    if isinstance(value, Sequence):
        return tuple(value)
    return (value,)