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Shuffles the sequence x in place.
Elements that are "heavier" will be more likely to be at the beginning.
The `key_weight` argument can be used to define how to access the element's weight.
By default, we assume x to be a sequence of (element, weight) tuples.

        def weighted_shuffle(x, key_weight=None):
    """Shuffles the sequence x in place.
    Elements that are "heavier" will be more likely to be at the beginning.
    The `key_weight` argument can be used to define how to access the element's weight.
    By default, we assume x to be a sequence of (element, weight) tuples.
    """
    if key_weight is None:
        key_weight = lambda t: t[1]
    
    weights = [(i, key_weight(e)) for e in enumerate(x)]
    
    for i in reversed(xrange(1, len(x))):
        j = weighted_pick(weights[:i+1])
        x[i], x[j] = x[j], x[i]
        


src/d/j/django-carousel-HEAD/carousel/models.py   django-carousel(Download)
from django.utils.translation import ugettext_lazy as _
 
from utils import weighted_shuffle, shuffled
 
class Carousel(models.Model):