def distribute(sequence):
    """
    Enumerate the sequence evenly over the interval (0, 1).

    >>> list(distribute('abc'))
    [(0.25, 'a'), (0.5, 'b'), (0.75, 'c')]
    """
    m = len(sequence) + 1
    for i, x in enumerate(sequence, 1):
        yield i / m, x
