def dist_euclidean(src, tar, qval=<NUM_LIT:2>, alphabet=None):
return Euclidean().dist(src, tar, qval, alphabet)<EOL>
Return the normalized Euclidean distance between two strings.

    This is a wrapper for :py:meth:`Euclidean.dist`.

    Parameters
    ----------
    src : str
        Source string (or QGrams/Counter objects) for comparison
    tar : str
        Target string (or QGrams/Counter objects) for comparison
    qval : int
        The length of each q-gram; 0 for non-q-gram version
    alphabet : collection or int
        The values or size of the alphabet

    Returns
    -------
    float
        The normalized Euclidean distance

    Examples
    --------
    >>> round(dist_euclidean('cat', 'hat'), 12)
    0.57735026919
    >>> round(dist_euclidean('Niall', 'Neil'), 12)
    0.683130051064
    >>> round(dist_euclidean('Colin', 'Cuilen'), 12)
    0.727606875109
    >>> dist_euclidean('ATCG', 'TAGC')
    1.0